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Now showing items 49 - 64 of 233

  • [IEEE 2011 IEEE 54th International Midwest Symposium on Circuits and Systems (MWSCAS) - Seoul, Korea (South) (2011.08.7-2011.08.10)] 2011 IEEE 54th International Midwest Symposium on Circuits and Systems (MWSCAS) - Effects of channel coding and interleaving in MIMO-OFDM systems

    Iqbal, Zafar   Nooshabadi, Saeid  

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  • [IEEE 2015 International Conference on Information and Communication Technology Convergence (ICTC) - Jeju Island, South Korea (2015.10.28-2015.10.30)] 2015 International Conference on Information and Communication Technology Convergence (ICTC) - Deployment strategy analysis for underwater cooperative wireless sensor networks

    Iqbal, Zafar   Lee, Heung-No  

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  • [IEEE 2016 30th International Conference on Advanced Information Networking and Applications Workshops (WAINA) - Crans-Montana, Switzerland (2016.3.23-2016.3.25)] 2016 30th International Conference on Advanced Information Networking and Applications Workshops (WAINA) - Cost and Load Reduction Using Heuristic Algorithms in Smart Grid

    Iqbal, Zafar   Javaid, Nadeem   Khan, Mobushir Riaz   Ahmed, Imran   Khan, Zahoor Ali   Qasim, Umar  

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  • [IEEE 2016 IEEE 30th International Conference on Advanced Information Networking and Applications (AINA) - Crans-Montana, Switzerland (2016.3.23-2016.3.25)] 2016 IEEE 30th International Conference on Advanced Information Networking and Applications (AINA) - A Smart Home Energy Management Strategy Based on Demand Side Management

    Iqbal, Zafar   Javaid, Nadeem   Khan, Mobushir Riaz   Khan, Farman Ali   Khan, Zahoor Ali   Qasim, Umar  

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  • Use of Multimodal Imaging in the Management of Tumor Embolism From the Inferior Vena Cava Through the Right Heart in a Patient With Renal Cell Carcinoma

    Colwell, Elizabeth M.   Gandhi, Sweeta D.   Iqbal, Zafar   Rashid, Zahir A.   Pagel, Paul S.  

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  • EFFECTS OF EXTRACTION SYSTEM ON ANTIOXIDANT ATTRIBUTES OF MUNGBEAN [VIGNA RADIATA (L.) WILCZEK]

    Anwar, Farooq   Iqbal, Zafar   Sultana, Bushra   Iqbal, Shahid   Saari, Nazamid  

    The effects of three extraction techniques (shaking, soaking, and stirring) and two solvents (80% methanol and 80% ethanol) on the antioxidant attributes of extracts from seeds of mungbean have been investigated. The yield of mungbean extracts varied between 6.90 and 9.65 g/100 g of dry matter. Mungbean extracts contained a considerable amount of phenolics (0.781.12 g GAE/100 g) and flavonoids (1.231.78 g CE/100 g). An appreciable level of reducing power (1.462.18) at 10 mg/mL extract concentration, inhibition of linoleic acid peroxidation (85.290.4%), and DPPH radical scavenging activity (IC50 value 16.442.9 g/mL) were also documented. Overall, the efficacy of an extraction system in isolating potent antioxidant components from mungbean seeds followed the order: shaking, 80% methanol > shaking, 80% ethanol > stirring, 80% methanol > stirring, 80% ethanol > soaking, 80% ethanol > soaking, 80% methanol. The yield and antioxidant activity of the mungbean extracts varied significantly (p < 0.05) as function of extraction techniques and solvents employed.
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  • Nuts and Seeds in Health and Disease Prevention || Nuts and Seeds Used in Health and Disease in Pakistan

    Iqbal, Zafar  

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  • A history of alcohol dependence increases the incidence and severity of postoperative cognitive dysfunction in cardiac surgical patients.

    Hudetz, Judith A   Patterson, Kathleen M   Byrne, Alison J   Iqbal, Zafar   Gandhi, Sweeta D   Warltier, David C   Pagel, Paul S  

    Postoperative cognitive dysfunction (POCD) commonly occurs after cardiac surgery. We tested the hypothesis that a history of alcohol dependence is associated with an increased incidence and severity of POCD in male patients undergoing cardiac surgery using cardiopulmonary bypass. Recent verbal and nonverbal memory and executive functions were assessed before and one week after surgery in patients with or without a history of alcohol dependence. Cognitive function was significantly reduced after cardiac surgery in patients with versus without a history of alcohol dependence. The results suggest that a history of alcohol dependence increases the incidence and severity of POCD after cardiac surgery.
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  • Promoting Effect of CeO2 and MgO for CO2 Reforming of Methane over Ni-ZnO Catalyst

    Singha, Rajib K.   Yadav, Aditya   Shukla, Astha   Iqbal, Zafar   Pendem, Chandrashekar   Sivakumar, Konathala   Bal, Rajaram  

    The purpose of this study was to find out the effect of CeO2 and MgO (as a promoter) on CO2 reforming of methane or dry reforming of methane (DRM) for the production of synthesis gas. In this aspect, CeO2 and MgO promoted Ni-nanoparticles supported ZnO catalyst was prepared by surfactant induced hydrothermal method, using cetyltrimethylammonium bromide (CTAB) as surfactant, morphology controlling agent and polyvinylpyrrolidone (PVP) as size controlling agent. The prepared catalysts were characterized by BET-Surface area, X-ray diffraction study (XRD), Scanning Electron Microscropy (SEM), Transmission Electron Microscopy (SEM), Inductively coupled plasma atomic emission spectroscopy (ICPAES), Temperature Programmed Reduction (TPR), X-ray Photoelectron Spectro-scopy (XPS) and Thermogravimetric Analysis (TGA) techniques. Highly basic nature of MgO and excellent redox properties of CeO2 increased nickel dispersion and created strong metal-support interaction, which effectively reduced the coke deposition on the catalyst surface. MgO promoted Ni-ZnO catalyst showed better low temperature activity compared to CeO2 promoted Ni-ZnO catalyst for DRM and Ni-MgO/ZnO catalyst also exhibited better coke resistivity, because of comparatively smaller nickel nanoparticles. Both the promoted catalysts showed more than 24 h of time on stream (TOS) stability at 800 degrees C without any significant deactivation of the catalysts. The catalysts produced H-2/CO ratio 0.99 at 800 degrees C during the TOS.
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  • Multivariate approach to the classification and ordination of the forest ecosystem of Nandiar valley western Himalayas

    Haq, Faizul   Ahmad, Habib   Iqbal, Zafar   Alam, Mukhtar   Aksoy, Ahmet  

    Questions: Does the vegetation composition of the forests of Nandiar Valley correlate with climatic, topographic and edaphic variables? Is it possible to identify plant communities through indicator species in relation to environmental gradients? Can this approach of classification and ordination will be helpful for conservation planning? Location Forests of Nandiar Valley, Moist temperate Western Himalayas Pakistan. Methods: Eighty stands were selected for quantitative and qualitative characteristic of vegetation between an elevations of 525-3817 m. Species composition was recorded by using 400 m long transects. GPS, climatic, edaphic and topographic data were recorded for each sampling site. The relationship between habitat types, species composition and distribution along with climatic, edaphic and topographic variables were analyzed using TWINSPAN, Cluster analysis and DCA ordination. Results: Sum 325 vascular plants species belonging to 97 families were recorded. Diversity index and species richness was maximum in the moist temperate zone. Classification and ordination showed that the variance in species data was 7.07. Two-ways indicator species analysis classified the vegetation into eight plant communities. Indicator species analysis revealed that slope aspect, wind speed, temperature, dew point, wet bulb, pH, organic matter and phosphorous were the strongest parameters (p <=3D 0.05) determining plant community composition and indicator species in each habitat. The results also show the strength of the environment species relationship using Monte Carlo procedures. DCA ordination grouped different species having similar habitat and habitats having common species. Conclusions: The multivariate analysis of the vegetation along with environmental variables of Nandiar valley confirmed the indicators of each sort of vegetation communities/microclimatic zones which could further be used in conservation planning and management not only in studied area but also in the adjacent regions as well as in the areas exhibit similar sort of climatic, edaphic and topographic conditions.
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  • Synthesis of Phthalonitriles Using a Palladium Catalyst

    Iqbal, Zafar   Lyubimtsev, Alexey   Hanack, Michael  

    An easy synthetic method to obtain phthalonitriles from o-dibroinobenzenes under mild conditions in high yields using Zn(CN), and a catalytic amount of tris(dibenzylideneacetone)dipalladium and 1, 1'-bis(diphenylphosphino)ferrocene is described.
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  • Directed self-assembly of individual vertically aligned carbon nanotubes RID B-5243-2008

    Goyal, Amit   Liu, Sheng   Iqbal, Zafar   Fetter, Linus A.   Farrow, Reginald C.  

    The deposition of high-aspect-ratio particles such as carbon nanotubes may be done in sub-100-nm windows in insulating thin films over metal using electrophoresis. Surface charge on the insulator causes the windows to become nanoscopic electrostatic lenses. Under certain conditions only one nanotube will be deposited at the base of a window. Finite element analysis shows that the number of deposited nanotubes is controlled by the electric field and the geometry of the windows and nanotubes. This discovery enables the process integration of carbon-based electronics with more traditional technologies such as complementary metal oxide semiconductor using the current generation of lithography and process technology. Devices such as vertical field effect transistors and interconnected nanoprobe arrays may now be fabricated in the metal levels to facilitate three-dimensional polylithic circuit architectures.
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  • Intracardiac masses associated with permanent endocardial pacemaker lead erosion through the skin

    Gandhi, Sweeta D.   Shah, Bimal   Iqbal, Zafar   Markan, Sandeep   Novalija, Jutta   Pagel, Paul S.  

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  • Rapid CE-UV evaluation of polypyrrole-coated magnetic nanoparticles for selective binding of endocrine disrupting compounds and pharmaceuticals by aromatic interactions

    Miah, Musharraf   Iqbal, Zafar   Lai, Edward P. C.  

    Endocrine disrupting compounds (EDCs) and pharmaceuticals in water have negative impacts on human health and environmental ecology. Sorbents that can selectively remove these compounds based on their chemical functionality would have a significant health benefit to humans and wildlife. In this work, polypyrrole-coated magnetic nanoparticles (MNPs@PPy) were evaluated as a sorbent for extraction and preconcentration of bisphenol A (BPA), metformin (MF), naphthalene acetic acid (NAA), phenformin (PF) and triclosan (TC). Both in-capillary and in vitro binding efficiencies were determined using capillary electrophoresis with ultraviolet detection (CE-UV). In-capillary binding efficiencies of 99 +/- 1% were found for BPA, PF and TC, which were confirmed by in vitro binding tests. Apparently, MNPs@PPy bound strongly with aromatic compounds due to pi-pi bonding interactions. A mixture of ethyl acetate and methanol (75 : 25 v/v) was evaluated as the eluting solvent. CE-UV analysis determined the % recoveries to be 85 +/- 13% for MF and PF which were adequate for analyte preconcentration by this method. A new coating of PPy was successfully added on the used particles for regeneration of their surfaces to achieve a binding efficiency of as high as 94 +/- 3%.
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  • Phenothiazine-based dyes with bilateral extension of pi-conjugation for efficient dye-sensitized solar cells

    Iqbal, Zafar   Wu, Wu-Qiang   Kuang, Dai-Bin   Wang, Lingyun   Meier, Herbert   Cao, Derong  

    Four novel organic photo-sensitizers based on phenothiazine were designed, synthesized and characterized for efficient dye-sensitized solar cells. Anisole, octyloxybenzene and dodecyloxybenzene were incorporated into the phenothiazine by an Ullmann reaction. An additional octyloxybenzene was incorporated into one dye unit through a Suzuki coupling reaction. The modified phenothiazine moiety acts as an electron donor and cyanoacrylic acid acts as an electron acceptor and anchoring unit. The photophysical, electrochemical and sensitizing characteristics of the new dyes were evaluated. The bis(octyloxybenzene) substituted dye delivered the best performance with its sensitized solar cell displaying an overall power conversion efficiency of 5.73% under standard illumination. The results indicate that bilateral conjugate extension of the pi conjugation can increase their light harvesting capacity and electron lifetime, leading to improvements in the efficiency of their dye-sensitized solar cells. (C) 2012 Elsevier Ltd. All rights reserved.
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  • Exome sequencing identifies three novel candidate genes implicated in intellectual disability.

    Agha, Zehra   Iqbal, Zafar   Azam, Maleeha   Ayub, Humaira   Vissers, Lisenka E L M   Gilissen, Christian   Ali, Syeda Hafiza Benish   Riaz, Moeen   Veltman, Joris A   Pfundt, Rolph   van Bokhoven, Hans   Qamar, Raheel  

    Intellectual disability (ID) is a major health problem mostly with an unknown etiology. Recently exome sequencing of individuals with ID identified novel genes implicated in the disease. Therefore the purpose of the present study was to identify the genetic cause of ID in one syndromic and two non-syndromic Pakistani families. Whole exome of three ID probands was sequenced. Missense variations in two plausible novel genes implicated in autosomal recessive ID were identified: lysine (K)-specific methyltransferase 2B (KMT2B), zinc finger protein 589 (ZNF589), as well as hedgehog acyltransferase (HHAT) with a de novo mutation with autosomal dominant mode of inheritance. The KMT2B recessive variant is the first report of recessive Kleefstra syndrome-like phenotype. Identification of plausible causative mutations for two recessive and a dominant type of ID, in genes not previously implicated in disease, underscores the large genetic heterogeneity of ID. These results also support the viewpoint that large number of ID genes converge on limited number of common networks i.e. ZNF589 belongs to KRAB-domain zinc-finger proteins previously implicated in ID, HHAT is predicted to affect sonic hedgehog, which is involved in several disorders with ID, KMT2B associated with syndromic ID fits the epigenetic module underlying the Kleefstra syndromic spectrum. The association of these novel genes in three different Pakistani ID families highlights the importance of screening these genes in more families with similar phenotypes from different populations to confirm the involvement of these genes in pathogenesis of ID. =20
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