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Search Results: 1 - 10 of 8063 matches for " Rafiq Ahmad Pampoori "
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Clinical Predictors for Successful Uvulopalatopharyngoplasty in the Management of Obstructive Sleep Apnea
Aamir Yousuf,Zafarullah Beigh,Raja Salman Khursheed,Aleena Shafi Jallu,Rafiq Ahmad Pampoori
International Journal of Otolaryngology , 2013, DOI: 10.1155/2013/290265
Abstract: Objective. To assess the clinical parameters for successful uvulopalatopharyngoplasty in the management of obstructive sleep apnoea syndrome documented with pre- and postoperative polysomnography. Materials and Methods. A study group of 50 patients diagnosed as having OSA by full night polysomnography were assessed clinically and staged on basis of Friedman staging system. BMI and neck circumference were considered, and videoendoscopy with Muller’s maneuver was done in all to document the site of obstruction. The study group divided into surgical and nonsurgical ones. Twenty-two patients out of fifty were then selected for uvulopalatopharyngoplasty. The selection of surgical group was done primarily on basis of clinical parameters like neck circumference, Friedman stage of the patient and site, and/or level of obstruction of patient. Postoperative polysomnography was done six months after surgery to document the change in AHI score. Result. The study group consists of fifty patients with mean age of years. UPPP was done in twenty-two, and the result of the surgery as defined by 50% reduction in preoperative AHI with postoperative AHI < 20/h was seen to be 95.2%. Postoperative change in AHI done after 6-month interval was seen to be statistically significant with P value < 0.001. Conclusion. UPPP is ideal option for management of obstructive sleep apnoea syndrome in properly selected patients on the basis of Friedman stage and site of obstruction detected by videoendoscopy with Muller’s maneuver. 1. Introduction Obstructive sleep apnea (OSA) is a common condition, affecting 4% of men and 2% of women [1]. Currently the condition is diagnosed by history, physical examination, imaging studies, and polysomnography. Common symptoms of the condition have limited predictive value in identifying patients with OSA. The upper airway is the main anatomical site responsible for OSA. Clinical examination may point to severe retrognathia, hypertrophic tonsils, macroglossia and redundant pillars, elongated uvula, and a crowded oropharynx [2]. Endoscopic investigations have been performed in awake as well as in sleeping patients, with the pharynx in relaxed or active states, but their predictive value remains limited, both for diagnostic purposes and for identifying patients who may benefit from surgery [3]. The otolaryngologist has the unique opportunity to examine the palate, pharynx, and neck of the patient and suspect OSA when appropriate. Diagnosis of a disease is based on clinical symptoms and physical findings and is corroborated by laboratory examinations.
Performance Evaluation of Efficient XOR Structures in Quantum-Dot Cellular Automata (QCA)  [PDF]
Mohammad Rafiq Beigh, Mohammad Mustafa, Firdous Ahmad
Circuits and Systems (CS) , 2013, DOI: 10.4236/cs.2013.42020
Abstract:

Quantum-dot cellular automaton (QCA) is an emerging, promising, future generation nanoelectronic computational architecture that encodes binary information as electronic charge configuration of a cell. It is a digital logic architecture that uses single electrons in arrays of quantum dots to perform binary operations. Fundamental unit in building of QCA circuits is a QCA cell. A QCA cell is an elementary building block which can be used to build basic gates and logic devices in QCA architectures. This paper evaluates the performance of various implementations of QCA based XOR gates and proposes various novel layouts with better performance parameters. We presented the various QCA circuit design methodology for XOR gate. These layouts show less number of crossovers and lesser cell count as compared to the conventional layouts already present in the literature. These design topologies have special functions in communication based circuit applications. They are particularly useful in phase detectors in digital circuits, arithmetic operations and error detection & correction circuits. The comparison of various circuit designs is also given. The proposed designs can be effectively used to realize more complex circuits. The simulations in the present work have been carried out using QCADesigner tool.

Color Information Encoding Based on Phase-Truncated Gyrator Transform Domain  [PDF]
Muhammad Rafiq Abuturab, Tajuddin Ali Ahmad
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2014, DOI: 10.4236/ijcns.2014.74013
Abstract:

A color information encryption method using phase-truncated gyrator transform domain is proposed. In this technique, the color image is decomposed into R, G and B channels. The decomposed three RBG channels evade the interference of crosstalks efficiently. Each channel is separately modulated to the first random phase mask and then gyrator transformed. The transformed image is phase-truncated to get first encoded image and amplitude-truncated to produce first asymmetric phase key. The obtained image is modulated to the second random phase mask and then again gyrator transformed. The resulted image is phase-truncated to obtain second encoded image and amplitude-truncated to generate second asymmetric phase key. The proposed system includes transformation angles of GT and asymmetric phase keys as decryption keys. The proposed system can be implemented digitally or optically. The optical setup is free from optical misalignment problem. The theoretical analysis and numerical simulation results both validate the proposed technique.

Ostrowski, Grüss, Cebysev type inequalities for functions whose second derivatives belong to Lp(a, b) and whose modulus of second derivatives are convex
RAFIQ,ARIF; AHMAD,FAROOQ;
Revista Colombiana de Matemáticas , 2007,
Abstract: ostrowski, grüss, cebysev type inequalities involving functions whose second derivatives belong to lp(a,b) and whose modulus of second derivatives are convex are established. the results provide better bounds than those currently available in the literature.
Ostrowski, Grüss, Cebysev type inequalities for functions whose second derivatives belong to Lp(a, b) and whose modulus of second derivatives are convex Desigualdades del tipo Ostrowski, Grüss, Cebysev para funciones cuya segunda derivada pertenece a Lp(a, b) y cuyo módulo de segunda derivada es convexo
ARIF RAFIQ,FAROOQ AHMAD
Revista Colombiana de Matemáticas , 2007,
Abstract: Ostrowski, Grüss, Cebysev type inequalities involving functions whose second derivatives belong to Lp(a,b) and whose modulus of second derivatives are convex are established. The results provide better bounds than those currently available in the literature. Se establecen desigualdades de tipo Ostrowski, Grüss, Cebysev que comprenden funciones cuyas segundas derivadas pertenecen a Lp(a,b) y cuyos módulos de segundas derivadas son convexos. Los resultados obtenidos proporcionan mejores cotas que las actualmente disponibles en la literatura.
Foliar Application of Potassium Nitrate Affects the Growth and Nitrate Reductase Activity in Sunflower and Safflower Leaves under Salinity
Nusrat JABEEN,Rafiq AHMAD
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 2011,
Abstract: Effect of foliar application of KNO3 on growth and the activity of nitrate reductase were studied in the leaves of sunflower (Helianthus annuus L.) and safflower (Carthamus tinctorius L.) plants growing under different levels of salinity. The seeds were sown in pots under non saline condition and saline water irrigation was started at three leaf stage after germination. Different concentration of saline water (i.e. 0.3% and 0.6%, equivalent to an EC of 4.8 and 8.6 dS/m respectively) were made by dissolving sea salt per litre of tap water. Nutrient solution of KNO3 was sprayed at the rate of 250 ppm. The concentration of Na+ and Cl- rapidly increased in the leaves of both the plants under salinity stress. In contrast the nitrate (NO3-) and soluble protein concentration were decreased with the increasing salinity. Salinity reduced leaf area, its fresh and dry weight per plant and also inhibited the activity of Nitrate reductase (NRA) enzyme. The application of KNO3 significantly reduced the increasing tendency of Na+ and Cl- and increased leaf area, its fresh and dry weight per plant, NO3- and soluble protein concentration and NR activity in leaves irrespective to the growth of plant under non saline or saline conditions.
New Ninth Order J-Halley Method for Solving Nonlinear Equations  [PDF]
Farooq Ahmad, Sajjad Hussain, Sifat Hussain, Arif Rafiq
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.412233
Abstract:

In the paper [1], authors have suggested and analyzed a predictor-corrector Halley method for solving nonlinear equations. In this paper, we modified this method by using the finite difference scheme, which had a quantic convergence. We have compared this modified Halley method with some other iterative methods of ninth order, which shows that this new proposed method is a robust one. Some examples are given to illustrate the efficiency and the performance of this new method.

Studying the Effects of Adding Silica Sand Nanoparticles on Epoxy Based Composites
Tahir Ahmad,Othman Mamat,Rafiq Ahmad
Journal of Nanoparticles , 2013, DOI: 10.1155/2013/603069
Abstract: The research about the preparation of submicron inorganic particles, once conducted in the past decade, is now leading to prepare polymer matrix composite (PMC) reinforced with nanofillers. The objective of present research is to study the modified effects of reinforcement dispersion of nanoparticle silica in epoxy resin on the physical properties, mechanical and thermal behaviour, and the microstructure of resultant composites. Stirrer mixing associated with manual mixing of silica sand nanoparticles (developed in our earlier research) (Ahmad and Mamat, 2012) into epoxy was followed by curing being the adopted technique to develop the subject nanocomposites. Experimental values showed that 15?wt.% addition of silica sand nanoparticles improves Young’s modulus of the composites; however, a reduction in tensile strength was also observed. Number of holes and cavities produced due to improper mixing turn out to be the main cause of effected mechanical properties. Addition of silica sand nanoparticles causes a reduction in degree of crystallinity of the nanocomposites as being observed in differential scanning calorimetry (DSC) analysis. 1. Introduction Nowadays industrial and academic research laboratories are focusing much of their efforts to develop and improve physical, mechanical, and electrical properties of polymer nanocomposites. Their interest to develop such composites is mainly because of the fact that nanoparticles present a high surface-to-volume ratio which may induct unique properties to these nanocomposites as compared to macro-scale composites [1]. Andritsch et al. [2] prepared nanocomposites filled with SiO2, Al2O3, and AIN with an average particles size from 22?nm to 10?nm and studied the nanoparticles dispersion and DC breakdown strength. They observed the highest DC breakdown strength for 0.5?wt.% for two component system. It was also noticed that the DC breakdown strength increased with 10?wt.% as compared to 2 and 5?wt.% and again decreased with 15?wt.% nano-fillers. Yasmin et al. [3] studied the dispersion of clay nanoparticles in epoxy-based composites using a three roll mill with the concentration of 1–10?wt.%. This technique was found highly efficient and environmentally friendly due to excellent dispersion of nanoparticles within a short time. Elastic modulus was improved up to 80% with 10?wt.% addition of clay nanoparticles in epoxy. Absence of any improvement in tensile strength of the nanocomposites over pure epoxy was due to the clustering of nanoparticles and/or to the occasional occurrence of nano- to microsize voids in
Evaluation of antimicrobial activity of a lectin isolated and purified from Indigofera heterantha  [PDF]
Sakeena Qadir, Ishfak Hussain Wani, Shaista Rafiq, Showkat Ahmad Ganie, Akbar Masood, Rabia Hamid
Advances in Bioscience and Biotechnology (ABB) , 2013, DOI: 10.4236/abb.2013.411133
Abstract:

Indigofera heterantha commonly called indigo bush is a member of leguminoseae family found in the Himalayan region of Kashmir. A lectin has been isolated from the seeds of Indigofera heterantha by the purification procedure involving anion exchange chromatography on DEAE-cellulose followed by gel filtration chromatography on Sephadex G 100. Molecular characterization of the lectin was done by gel filtration and SDS-PAGE. Activity of the lectin was checked by hemagglutination assay and the sugar specificity by sugar inhibition tests. The antimicrobial activity of the purified lectin was carried out by Agar disc diffusion using appropriate standards. On the ion exchange column, the bound protein when eluted with 0-0.5 M NaCl gradient emerged as three peaks—peak I, peak II and peak III out of which only peak II showed the hemagglutinating activity. The lectin further resolved into two peaks G1 and G2 on gel filtration, with the lectin activity residing in G1, corresponding to a molecular weight of 70 KDa. The purified lectin named as Indigofera heterantha Lectin (IHL) produced a single band on SDS PAGE (18 KDa), revealing the tetrameric nature of the lectin. It agglutinated human erythrocytes (A, B, AB, and O). Hemagglutination was inhibited by D-galactose, Dmannose and D-arabinose. The lectin is reasonably thermostable showing full activity within a temperature range of 30°C to 90°C. pH stability of the lectin falls in the range of 2-9. IHL demonstrated a remarkable antibacterial activity against the pathogenic bacteria Klebsiella pneumoniae, Staphylococcus aureus, Escherichia coli, and Bacillus subtilis. IHL also inhibited the growth

Dividend Payout Ratio and Firm’s Profitability. Evidence from Pakistan  [PDF]
Mudassar Hasan, Muhammad Ishfaq Ahmad, Muhammad Yasir Rafiq, Ramiz Ur Rehman
Theoretical Economics Letters (TEL) , 2015, DOI: 10.4236/tel.2015.53051
Abstract: This paper investigates the relationship between dividend payout ratio and profitability of a firm. For this, two main sectors of Pakistan are selected, energy and textile. The study covers a time span of 1996-2008. Firm performance is measured by earning per share (EPS) and return on assets (ROA). The results of logarithmic regression show that no matter what industry is, there is a negative impact of dividend payout ratio on next year earnings of a firm.
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