Papers by Syed Iqtidar Hussain
2011 19th European Signal Processing Conference, 2011
Object segmentation is an essential task in computer vision and object recognitions. In this pape... more Object segmentation is an essential task in computer vision and object recognitions. In this paper, we present an image segmentation technique that extract edge information from wavelet coefficients and uses mathematical morphology to segment the image. We threshold the image to get its binary version and get a high-pass image by the inverse DWT of its high frequency subbands from the wavelet domain. This is followed by an adaptive morphological closing operation that dynamically adjusts the structuring element according to the local orientation of edges. The ensued holes are, subsequently, filled by a morphological fill operation. For comparison, we are relying on the well-established Canny's method and show that, for images with low-textured background, our method performs better.
Proceedings of IEEE Vehicular Technology Conference (VTC)
Hussain and Barton (see Seventh IEE European Conference on Mobile Personal Communications, p.95-9... more Hussain and Barton (see Seventh IEE European Conference on Mobile Personal Communications, p.95-98, 1993) have shown that noncoherent binary frequency shift keying (BFSK) is subject to an irreducible error rate in the presence of phase noise. This paper extends the analysis of the performance degradation caused by oscillator phase noise to non-coherent orthogonal M-ary frequency shift keying (MFSK). It is
Bulletin of the Korean Chemical Society, 2007
Combined temperature programmed reaction (TPR) and infrared (IR) spectroscopic studies for Fische... more Combined temperature programmed reaction (TPR) and infrared (IR) spectroscopic studies for Fischer-Tropsch reaction have been performed over Ru/SiO 2 and Ru-Ag/SiO 2 supported catalysts. Reaction of linearly absorbed CO with hydrogen starts at 375 K over Ru/SiO 2 catalyst and reaches maximum at 420 K accompanied with an intensity decrease of linear CO absorption. The reaction with bridged absorbed CO peaks around 510-535 K. Addition of Ag yields mixed Ru-Ag bimetallic sites while it suppresses the formation of bridged bonded CO. Formation of methane on this modified surface occurs at 390 K and reaches maximum at 444 K. Suppression of hydrogen on the Ag-doped surface also occurs resulting in the formation of unsaturated hydrocarbons and of CH x intermediates not observed with Ru/SiO 2 catalyst. Such intermediates are believed to be the building blocks of higher hydrocarbons during the Fischer-Tropsch synthesis. Linearly absorbed CO is found to be more reactive as compared to bridged CO. The Ag-modified surface also produces CO 2 and carbon. On this surface, hydrogenation of CO begins at 390 K and reaches maximum at 494 K. The high temperature for hydrogenation of absorbed CO and C over Ru-Ag/SiO 2 catalyst as compared to Ru/SiO 2 catalyst is due to the formation of Ru-Ag bimetallic surfaces impeding hydrogen adsorption.
Kehoe (2007) advocates that in evaluating an economic model, the Sims-Cogley-Nason (SCN) approach... more Kehoe (2007) advocates that in evaluating an economic model, the Sims-Cogley-Nason (SCN) approach should be adopted in which empirical impulse responses are compared to those obtained from the identical structural VAR run on model generated data of the same length as actual observations. This paper examines, using Monte Carlo simulation, finite sample properties of the SCN approach. Throughout the paper, we use the simple textbook New-Keynesian model as data generating process, and focus on effects of the identified monetary shocks, derived by structural VAR with shortrun identification assumption. We find that when the model violates the identifying restriction and monetary shocks are misidentified, the SCN approach has poor small sample performance. We show that: 1) The estimated impulse responses are biased and uninformative; 2) The parameter estimates derived by matching impulse responses are biased and with large mean square error. Ironically, the very reason calling for the SCN approach-misidentification, is also the cause for its poor finite sample performance.
Asian Journal of Research in Chemistry, 2012
The solubility of Oxalic acid was studied in different solvents like water, chloroform, acetone, ... more The solubility of Oxalic acid was studied in different solvents like water, chloroform, acetone, alcohol and many percentile solutions of different solvents at different temperature. The heat of the solution of Oxalic acid in different solvent solvents was determined from the temperature–solubility data. The solubility of Oxalic acid in aqueous media increase with increase temperature while decrease with decrease temperature at constant pressure and electrolytes concentration. The decrease in the solubility of Oxalic acid was explained on the bases of ionic radii of anions and cations studies.
American journal of physiology. Endocrinology and metabolism, Jan 26, 2015
Tbc1d1 is a Rab GTPase activating protein (Rab GAP) implicated in regulating intracellular retent... more Tbc1d1 is a Rab GTPase activating protein (Rab GAP) implicated in regulating intracellular retention and cell surface localization of the glucose transporter GLUT4 and thus glucose uptake in a phosphorylation-dependent manner. Tbc1d1 is most abundant in skeletal muscle but is expressed at varying levels among different skeletal muscles. Previous studies with male Tbc1d1-deficient (Tbc1d1(-/-)) mice on standard and high fat diets established a role for Tbc1d1 in glucose, lipid and energy homeostasis. Here we describe similar, but also additional, abnormalities in male and female Tbc1d1-deficient mice. We corroborate that Tbc1d1 loss leads to skeletal muscle-specific and skeletal muscle type-dependent abnormalities in GLUT4 expression and glucose uptake in female and male mice. Using subcellular fractionation we show that Tbc1d1 controls basal intracellular GLUT4 retention in large skeletal muscles. But cell surface labeling of extensor digitorum longus muscle indicates that Tbc1d1 do...
International Journal of Biosciences (IJB), 2015
The study was carried out to investigate the chemical composition and mineral profile of three fi... more The study was carried out to investigate the chemical composition and mineral profile of three fish species namely Cyprinus carpio, Labeo rohita and Wallago attu inhabiting River Indus in Mianwali District. The study followed a 3 x 3 factorial arrangement by involving 3 fish species, each with 3 weight categories (W1≤1.0, W2≤1.5 and W3≤2.0 Kg). Chemical composition was determined by AOAC methods and selected minerals (Ca, K, Mg, Na, P, Cr, Fe, Mn, Ni, Zn, Hg and Pb) in fish muscles were analysed by inductively coupled plasma−optical emission spectroscopy (ICP-OES). It was investigated that crude protein contents in Labeo rohita, Cyprinus
JPMA. The Journal of the Pakistan Medical Association, 2013
To study the role of hyperbilirubinaemia as a predictive factor for appendiceal perforation in ac... more To study the role of hyperbilirubinaemia as a predictive factor for appendiceal perforation in acute appendicitis. The prospective, descriptive study was conducted at the Abbasi Shaheed Hospital and the Karachi Medical and Dental College, Karachi, from January 2010 to June 2012. It comprised all patients coming to the surgical outpatient department and emergency department with pain in the right iliac fossa with duration less than seven days. They were clinically assessed for signs and symptoms of acute appendicitis and relevant tests were conducted. Patients were diagnosed as a case of acute appendicitis on the basis of clinical and ultrasound findings, and were prepared for appendicectomy. Per-operative findings were recorded and specimens were sent for histopathology to confirm the diagnosis. SPSS version 10 was used to analyse the data. Of the 71 patients, 37 (52.10%) were male and 34 (47.90%) were female. The age range was 3-57 years, and most of the patients (n = 33; 46.5%) we...
International Journal of Surgery Case Reports, 2014
Zhongguo yi xue ke xue yuan xue bao. Acta Academiae Medicinae Sinicae, 2011
To evaluate the effectiveness and toxicity of sorafenib for advanced hepatocellular carcinoma. Ac... more To evaluate the effectiveness and toxicity of sorafenib for advanced hepatocellular carcinoma. According to the Cochrane handbook for systematic review, two reviewers independently completed the whole process of literature search, study selection, data collection, and quality assessment. Seven electric databases(PubMed, Cochrane Library, Embase, Chinese Journal Full-text Database, Chinese Biomedical Literature Database, Chinese Scientific and Technical Journal Database, Chinese Medical Association Digital Periodicals Database) were searched and randomized controlled trials (RCT) of sorafenib in the treatment of advanced hepatocellular carcinoma were collected and analyzed. Two RCT involving 828 patients were finally included. Compared with placebo, sorafenib significantly extended the overall survival and time to radiologic progression and improved the disease control rate. The main adverse effects were systemic, gastrointestinal, and dermatologic symptoms (grade 1 or 2 in severity)...
Veterinary Medicine International, 2014
This prospective study was conducted on 15 animals (eight buffaloes and seven cows), diagnosed wi... more This prospective study was conducted on 15 animals (eight buffaloes and seven cows), diagnosed with late pregnancy indigestion. Ten buffaloes and 10 cows served as the control group. The animals were in advanced pregnancy and had partial or complete anorexia, reduced water intake, loss of defecation or scanty faecal output, and mild to moderate dehydration. Heart and respiration rates were increased and rumen motility was reduced. Five animals had persistent tympany and moderate distension of left abdomen, and two animals each had bilateral abdominal distension and papple shaped abdomen. Neutrophil and lymphocyte counts were significantly higher and lower than the control values. Total bilirubin, AST, total protein, globulin, BUN, glucose, and lactate were significantly higher, and chloride and calcium were significantly lower than the control values. Levels of ALP, GGT, albumin, creatinine, cholesterol, triglyceride, fibrinogen, fibrinogen ratio, sodium, potassium, phosphorus, and ...
Wireless Personal Communications, 1994
In microwave systems, the phase noise is well known to be a significant source of degradation esp... more In microwave systems, the phase noise is well known to be a significant source of degradation especially for low data rate transmission, giving rise to a significant irreducible error rate. In an earlier study [1, 2] based on the European Space Agency's Olympus Satellite 30/20 GHz payload parameters, it was found that several thousands of simultaneous transmissions of 50 to 200 bits/sec each could be supported from hand-held pico-terminal earth stations. It is important to use the most appropriate modulation scheme in the presence of oscillator phase noise for such low data rate systems. It is generally assumed that noncoherent or differentially coherent modulation schemes will perform best in applications where the coherence time of the oscillators is short compared to the bit period. However, our analysis of these schemes has shown that they are subject to irreducible error rates and minimum useable data rates. This has led us to reconsider coherent BPSK (CPSK). It is shown that the choice of the optimum noise bandwidth of the phase locked loop (PLL) in the carrier recovery circuit is very important when considering the coherent schemes. The PLL bandwidth must be wide enough to track the oscillator phase noise at its input, but, on the other hand, it must be as narrow as possible to exclude the thermal noise. Results show that coherent BPSK in the phase noise contaminated channel is also subject to an irreducible error rate, which increases as the noise bandwidth is reduced. For the optimum loop bandwidth, however, this appears to be lower than the corresponding figure for DPSK [3]. There is a minimum useable data rate for any given bit error rate (BER) requirement. Results of a complete analysis are presented in the form of BER versus Eb/_No plots.
Oncology Reports, 1994
Three-weekly docetaxel chemotherapy with prednisolone is now considered standard of care for pati... more Three-weekly docetaxel chemotherapy with prednisolone is now considered standard of care for patients with metastatic hormone refractory prostate cancer (MHRPC). This study reports the efficacy and toxicity of first-line docetaxel chemotherapy followed subsequently by re-treatment on biochemical disease progression (BDP). Forty-two patients with MHRPC were treated with three-weekly docetaxel chemotherapy 75 mg/m 2 and 10 mg of prednisolone daily. Median age 73 years (range 58-87) and median initial PSA 182 ng/ml (range 19.9-1500). Of these patients, 10 were retreated with the same regimen (second-line chemotherapy) on BDP. A further 3 out of these 10 patients received 2nd re-treatment (third-line chemotherapy) with docetaxel chemotherapy on BDP. Fifty-four percent of patients responded to first-line docetaxel chemotherapy and all retreated patients responded again with a PSA reduction >50%. Median treatment-free interval prior to second and third-line chemotherapy was 24 and 26 weeks, respectively. Grade 3 or 4 neutropenia occurred in 2.5, 7 and 12% of the total number of cycles in patients receiving first-, second-and third-line docetaxel chemotherapy, respectively. Median survival was 13 months (range 3-35) and one-year overall survival 52%. This is the first report of three-weekly docetaxel chemotherapy re-treatment in patients with MHRPC and demonstrates that patients who initially respond to docetaxel chemotherapy maintain their sensitivity to subsequent retreatment without a significant rise in haematological toxicity.
New Journal of Chemistry, 2012
Journal of Natural Gas Chemistry, 2008
Methane decomposition using nickel, copper, and aluminum (Ni:Cu/Al) and nickel, copper, potassium... more Methane decomposition using nickel, copper, and aluminum (Ni:Cu/Al) and nickel, copper, potassium, and aluminum (Ni:Cu:K/Al) modified nano catalysts has been investigated for carbon fibers, hydrogen and hydrocarbon production. X-ray photoelectron spectroscopy (XPS), static secondary ion mass spectrometry (SSIMS), thermal gravimetric analysis (TGA), Fourier transform infrared (FT-IR), secondary electron microscopy/X-ray energy dispersive (SEM-EDX), and temperature programmed desorption (TPD) were used to depict the chemistry of the catalytic results. These techniques revealed the changes in surface morphology and structure of Ni, Cu, Al, and K, and formation of bimetallic and trimetallic surface cationic sites with different cationic species, which resulted in the production of graphitic form of pure carbon on Ni:Cu/Al catalyst. The addition of K has a marked effect on the product selectivity and reactivity of the catalyst system. K addition restricts the formation of carbon on the surface and increases the production of hydrogen and C 2 , C 3 hydrocarbons during the catalytic reaction whereas no hydrocarbons are produced on the sample without K. This study completely maps the modified surface structure and its relationship with the catalytic behavior of both systems. The process provides a flexible route for the production of carbon fibers and hydrogen on Ni:Cu/Al catalyst and hydrogen along with hydrocarbons on Ni:Cu:K/Al catalyst. The produced carbon fibers are imaged using a transmission electron microscope (TEM) for diameter size and wall structure determination. Hydrogen produced is CO x free, which can be used directly in the fuel cell system. The effect of the addition of Cu and its transformation and interaction with Ni and K is responsible for the production of CO/CO 2 free hydrogen, thus producing an environmental friendly clean energy.
Journal of Natural Gas Chemistry, 2009
In Fischer-Tropsch synthesis reaction, methane formation is one of the side reactions which must ... more In Fischer-Tropsch synthesis reaction, methane formation is one of the side reactions which must be suppressed in order to get better catalytic selectivity for light olefins. In the present study, we have modified cobalt based Fischer-Tropsch catalyst and developed a process to minimize methane production, consequently to produce maximum yield of light olefins. Manganese-cobalt oxide supported on H-5A zeolite catalyst was synthesized using modified H-5A zeolite, to increase its surface acid sites. Increased acidity of zeolite plays a major part in the suppression of methane formation during the Fischer-Tropsch reaction. The modified zeolite results in the electronic modification of catalyst surface by creating new active catalytic sites. The results are compared with other supported catalysts along with unmodified zeolite. Appreciable reduction in methane formation is achieved on modified zeolite supported catalyst in comparison with unsupported catalyst.
Journal of Materials Science, 2005
Journal of Coordination Chemistry, 2013
Instrumentation Science & Technology, 2011
The surface interaction of Ni:Cu=Al-and Ni:Cu:K=Al-modified catalyst has been studied using X-ray... more The surface interaction of Ni:Cu=Al-and Ni:Cu:K=Al-modified catalyst has been studied using X-ray photo electron studies (XPS), static secondary ion mass spectrometry (SSIMS), thermal gravimetric analysis (TGA), Fourier transform infrared (FTIR), scanning electron microscopy (SEM), and temperature programmed desorption (TPD). These techniques revealed that during catalytic studies of methane conversion to carbon nano tubes and hydrogen, the active metals are converted into different ionic and non ionic states coupled with formation of bimetallic= trimetallic oxides. The addition of potassium modified the metal active sites through ensemble effect by donating electrons to the catalytic multiple active sites. These species are responsible for the control of surface morphology and product selectivity during the catalytic reactions.
Journal of Trace and Microprobe Techniques, 2002
Co-impregnated ruthenium-manganese bimetallic catalysts supported on high-surface area silica sup... more Co-impregnated ruthenium-manganese bimetallic catalysts supported on high-surface area silica support were exposed to high-temperature reduction-oxidation-reduction (R/O/R) treatment to generate catalytic surfaces having specific geometry. The impact of R/O/R modifications was probed via a model Fischer-Tropsch synthesis (FTS) reaction aided by various characterisation techniques (TEM, XPS, s-SIMS, selective chemisorption). The characterisation results indicated that alternating reduction and oxidation of the catalyst was propitious to the formation of a specific surface landscape enriched in Ru : Mn bimetallic sites as well as in ruthenium and manganese oxides. The increase in metal dispersion and BET surface area following R/O/R exposures of the catalysts was due to re-dispersion of particles in the range of 2-10 nm, to surface modification, and to changes in active sites. The presence of ruthenium oxide, manganese oxide and Ru : Mn was likely to be at the origin of the enhancement in the production of unsaturated hydrocarbons in the FTS reaction.
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Papers by Syed Iqtidar Hussain