Papers by Syed Iqtidar Hussain
3 Abstract: In the present study we are reporting the antifungal and immunomodulatory activities ... more 3 Abstract: In the present study we are reporting the antifungal and immunomodulatory activities of various fractions of Nepeta suavis, such as, chloroform, hexane, butanol, ethyl acetate and aqueous. The chloroform and butanol fractions showed inhibitory action against Trichophyton longifusus, Aspergillus flavus, Candida albicans, Fusarium solani and Microsporumcanis. In case of immunomodulat ory study, the chloroform fraction showed clear modulatory effect for oxidative burst of polymorphoneutrophils and ethylacetate for the whole blood, while the aqueous fraction showed moderate inhibition. Hence, both the chloroform and ethylacetate fractions of Nepeta suavis are recommended further for the identification and isolation of active compounds, responsible for the observed effects.
Polymer, 2002
The thermorheological properties of a range of hydroxypropyl methylcellulose (HPMC) solutions hav... more The thermorheological properties of a range of hydroxypropyl methylcellulose (HPMC) solutions have been studied with a view to determining the concentration and substitution dependence of the gelation process. Solutions containing up to 20% w/v HPMC were prepared using three grades of material (METHOCEL11Trademark of The Dow Chemical Company. E4M, F4M, K4M). Rheological studies were performed using a TA AR1000-N Rheometer.
Proceedings of ISCAS'95 - International Symposium on Circuits and Systems
This paper presents accurate series-transistor reduction techniques which extend the applicabilit... more This paper presents accurate series-transistor reduction techniques which extend the applicability of linear and nonlinear macromodels to more complex structures through accurately modeling the channel length modulation effect, effective transconductance, input terminal position dependence, parasitic capacitances, such as gate coupling capacitances, and the body effect. Adequate solutions to address these sources of delay errors have not been previously provided. Errors, if secondary effects are not addressed, may total 100% or more. The significant improvement in simulation accuracy using these proposed techniques is shown
a Gram positive rod which generally appears coccoid. The disease is manifested by local inflammat... more a Gram positive rod which generally appears coccoid. The disease is manifested by local inflammation at the site of bacterial entrance, and abscessation of both internal and external lymph nodes (Glen, 2000). Goats are more prone to the external abscesses while sheep are more prone to internal abscesses (Baird and Fontaine, 2007). Internal abscesses are detectable only at necropsy. It is the internal abscesses that are fatal, whereas external abscesses are generally responsible for disease transmission (Ivanovic
Information Sciences, 2015
ABSTRACT Determining valid clustering is an important research problem. This problem becomes comp... more ABSTRACT Determining valid clustering is an important research problem. This problem becomes complex if the underlying data has inherent uncertainties. The work presented in this paper deals with clustering large probabilistic graphs using multi-population evolutionary algorithm. The evolutionary algorithm (EA) initializes its multiple populations, each representing a deterministic version of the same probabilistic graph given to it as an input. Multiple deterministic versions of the same input graph are generated by applying different thresholds to the edges. Each chromosome of the multiple populations represents one complete clustering solution. For the purpose of clustering, EA is employed which is guided by pKwikCluster algorithm. The proposed approach is tested on two natively probabilistic graphs and nine synthetically converted probabilistic graphs using cluster validity indices of Davies-Bouldin index, Dunn index, and Silhouette coefficient. The proposed approach is also compared with two baseline clustering algorithms for uncertain data, Fuzzy-DBSCAN and uncertain K-mean and two state-of-the-art approaches for clustering probabilistic graphs. The results obtained suggest that the proposed solution gives better performance than the baseline methods and the state-of-the-art algorithms.
Chinese Journal of Catalysis, 2007
Doping sulfated zirconia with silica increases the acidity of the sulfated zirconia. This modifie... more Doping sulfated zirconia with silica increases the acidity of the sulfated zirconia. This modified catalyst was used for liquid-phase dehydration of methanol at 413-453 K as a model reaction. Methanol is sequentially dehydrated to dimethyl ether and ethylene over both sulfated zirconia and silica-doped sulfated zirconia in a single step. Also, significant amounts of propylene are formed by the silica-doped catalyst but not by the undoped catalyst. The data were discussed in relation to increased acid active sites after doping with silica, which electronically modified the catalyst surface.
2014 International Conference on Robotics and Emerging Allied Technologies in Engineering (iCREATE), 2014
ABSTRACT This paper focuses on stability of under-actuated two-link robot implemented over networ... more ABSTRACT This paper focuses on stability of under-actuated two-link robot implemented over network control Systems. The proposed control system stabilizes and balances the robot in erect position. This paper differentiates synchronous and asynchronous actuation. Smith predictor has been used to handle dead time and control closed loop over asynchronous actuation. The simulation results demonstrate the efficiency of the proposed scheme.
SSRN Electronic Journal, 2010
... numbers would be regarded as equally probable. But, as Dr. Benford's revealed, in a ... more ... numbers would be regarded as equally probable. But, as Dr. Benford's revealed, in a huge range of number sequences from random samples of a day's stock quotations, the numbers on the front page of The New York Times ...
Applied Biological Research, 2014
Polymer Science Series B, 2013
Polyhedron, 2011
A new single source heterobimetallic precursor [Cu4Y2(dmae)6(OAc)4Cl2(H2O)2] 1, having a low deco... more A new single source heterobimetallic precursor [Cu4Y2(dmae)6(OAc)4Cl2(H2O)2] 1, having a low decomposition temperature and sufficiently high solubility in organic solvents, was synthesized in high yield by a simple chemical technique and analyzed by melting point, elemental analysis, FT-IR, single crystal X-ray crystallography and thermal analysis for selective deposition of Cu–Y mixed metal oxide thin films. The TGA analysis proves that complex 1 undergoes a controlled thermal decomposition at 723K to give a Cu–Y mixed metal oxide residue. The aerosol assisted chemical vapor deposition technique was used to deposit a high-quality halide free Cu–Y mixed metal oxide thin films with good adhesion to the substrate at a relatively low temperature (723K). The chemical composition and surface morphology of the deposited thin films were analyzed by X-ray diffraction, scanning electron microscopy and energy dispersive X-ray, which suggest the formation of impurity-free crystallite mixtures of Cu2Y2O5 and CuO, with well defined crystalline particles evenly distributed in the range 0.3–0.4μm. The optical bandgap energy of the thin film was estimated, and it is about 1.66eV. The voltage–current characteristics and thickness of the thin films were determined with a voltmeter using the four-probe method and RBS analysis, respectively.
Materials Letters, 2013
NiO nanocrystals anchored on carbon nanotubes (CNTs) were fabricated via a polyvinylpyrrolidone a... more NiO nanocrystals anchored on carbon nanotubes (CNTs) were fabricated via a polyvinylpyrrolidone assisted co-precipitation route. At a current density of 100 mA g -1 , the composite anode delivers an initial reversible capacity of 962 mA h g -1 and retains the capacity to 601 mA h g -1 after 50 cycles. In contrast, the reversible capacity of the pure NiO particles faded to 380 mA h g -1 immediately and then gradually decreased to 278 mA h g -1 after 50 cycles. The significantly improved electrochemical performance of the NiO/CNT nanocomposite is attributed to the formation of conductive networks by CNTs, and large surface areas of NiO nanoparticles grown on CNTs which stabilizes these nanoparticles against agglomeration and reduces the diffusion length for lithium-ions. The present results indicate that NiO/CNT nanocomposite has potential applications in lithium-ion battery anodes.
Journal of Plastic Film & Sheeting, 2013
Poly(azo-pyridyl-urethane)/multi-walled carbon nanotube (PAPU/MWCNT) nanocomposites were prepared... more Poly(azo-pyridyl-urethane)/multi-walled carbon nanotube (PAPU/MWCNT) nanocomposites were prepared by first synthesizing polyurethane followed by solution dispersing MWCNT in the matrix. We have used two different MWCNTs: the first set of MWCNT contained carboxylic acid group (MWCNT-COOH) and the second set contained acid chloride group (MWCNT-COCl). Afterward, these MWCNT particles were used in the preparation of PAPU/MWCNT nanocomposites. In the first set of nanocomposites, MWCNT-COOH and PAPU were just physically mixed and were designated as PAPU/MWCNT-A. In the second set of nanocomposites, PAPU chains were tethered onto the surfaces of MWCNT-COCl particles and designated as PAPU/MWCNT-AC. Two types of nanocomposites were thus fabricated, including acid functionalized nanotube-based non-tethered PAPU/MWCNT and acid chloride functionalized MWCNT-based tethered system. We have incorporated hydroxyl end-terminated polyurethane via “ grafting to” approach to acid chloride functional ...
Journal of Physics: Conference Series, 2013
We report on the effect of multi-walled carbon nanotubes (MWCNTs) on different properties of phen... more We report on the effect of multi-walled carbon nanotubes (MWCNTs) on different properties of phenolic resin. A low content of MWCNTs (~ 0.05 wt%) was mixed in phenolic resin and a stable dispersion was achieved by ultrasonication, followed by melt mixing. After curing the characterization of these composites was done by using scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and Fourier transform infra-red spectroscopy (FTIR). The thermal and ablative properties of carbon fiber reinforced MWCNTs-phenolic nanocomposites were also studied. The addition of MWCNTs showed improvement in thermal stability and ablation properties.
Journal of Environmental Engineering, 2010
A study was conducted to evaluate the performance of locally available electric arc furnace slag ... more A study was conducted to evaluate the performance of locally available electric arc furnace slag (EAFS) as a substrate for removing phosphorus from wastewater. First, in a laboratory study, EAFS was found to have high phosphorus removal efficiency for three P concentrations (0.3, 3.0, and 6.0 mg/L); this resulted in nearly 100% phosphorus removal in 24 h. Next, the experiment was repeated using aeration and similar phosphorus removal was observed but in a shorter contact time of 1 h. The adsorption capacity of EAFS was determined to be 1,458 mg/kg. In a pilot-scale study, over 90% P removal took place in the first 4 h under nonaerated conditions, and nearly 100% removal in 8 h. While the P removal with aeration was relatively less initially for the shorter residence times, a 100% removal was observed for the 24-h residence time.
Journal of Catalysis, 2001
The catalytic wet oxidation of aqueous phenol over Mn-Ce-O mixed oxide catalysts was shown to be ... more The catalytic wet oxidation of aqueous phenol over Mn-Ce-O mixed oxide catalysts was shown to be accompanied by undesirable formation of heavy polymers on the catalyst surface, leading to severe loss in catalytic activity and in mineralization selectivity. New potassium-doped Mn-Ce-O mixed oxide catalysts were developed and benchmarked for the destruction of concentrated phenolic (10 3 ppm) synthetic wastewater at very mild conditions (110 • C and 0.5 MPa O 2 pressure). Remarkable improvements in mineralization selectivity were attained. Complete removal of total organic pollution was achieved within 10-20 min and mineralization selectivity exceeding 95% was attained over fresh K-Mn-Ce-O catalyst. The leach-proof ability of the catalyst was confirmed from analysis of the treated waters. Detailed characterization of fresh and spent K-doped catalysts revealed drastic reduction in carbonaceous deposits on the catalyst surface, even after successive runs of non-regenerated catalyst samples. The catalyst surface was found to be active after the catalyst was reused thrice, though this time the TPO-detected surface carbonaceous species were far less than those in the nonpromoted Mn-Ce-O catalyst.
Journal of Alloys and Compounds, 2013
Nanospheres of CuO are synthesized by a facile solution reaction of CuCl 2 in the presence of car... more Nanospheres of CuO are synthesized by a facile solution reaction of CuCl 2 in the presence of carbon nanotubes (CNTs), yielding a composite material. Transmission electron microscopy (TEM) confirms the uniform dispersion of CuO nanospheres on the CNTs surface. The functional groups are determined by Fourier transform infrared spectroscopy (FTIR) and elemental composition is confirmed by Rutherford backscattering spectroscopy (RBS), while the structure and morphology of the deposited electrodes are investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. Electrochemical characterization by cyclic voltammetry (CV) and galvanostatic charge/discharge tests demonstrate high rate capability and superior cycling stability for CuO/CNT composite with a high specific capacity of 638 mAh/g for up to 50 cycles. It is anticipated that this high efficiency is due to the high dispersion of CuO nanospheres and excellent conductivity of CNTs mesh.
International Journal of Polymeric Materials and Polymeric Biomaterials, 2013
ABSTRACT
International Journal of Computational Methods, 2008
In this paper we implement and compare the performance of the Message Passing Interface (MPI) sta... more In this paper we implement and compare the performance of the Message Passing Interface (MPI) static master-worker and three strategies of MPI task farm implementations for fractal image compression on a Beowulf cluster of workstations, namely Local Predecimation with Range Index Communication (LPRI), Global Predecimation with Range Communication (GPR) and No Predecimation with Range Index Communication (NPRI). Our results show that the MPI task farm implementations balance the load effectively among workers as compared to the MPI static master-worker implementation. The task farm strategies are compared by measuring their speedup and worker idle time cost.
Journal of Trace and Microprobe Techniques, 2001
CO adsorption on bimetallic Ag/Ru and Pd/Ru surfaces obtained by depositing Pd and Ag on a Ru (00... more CO adsorption on bimetallic Ag/Ru and Pd/Ru surfaces obtained by depositing Pd and Ag on a Ru (0001) single crystal at 540 K and 1110 K has been studied by means of HREELS and s-SIMS. The data shows that CO adsorbs on Ag/Ru surfaces in the linear co-ordination as is found on clean Ru (0001). HREELS spectra for CO adsorbed
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Papers by Syed Iqtidar Hussain