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Hussain, Muzammil,Mazhar, Muhammad,Rauf, Muhammad Khawar,Ebihara, Masahiro,Hussain, Tajammal Korean Chemical Society 2009 Bulletin of the Korean Chemical Society Vol.30 No.1
A new precursor [$Zr(acac)_{3}(H_{2}O)_{2}$] was synthesized by Sonochemical technique and used to deposit thin $ZrO_{2}$ film on quartz and ceramic substrate via ultrasonic aerosol assisted chemical vapour deposition (UAACVD) at 300 ${^{\circ}C}$ in oxygen environment followed by annealing of the sample for 2-3 minutes at 500 ${^{\circ}C}$ in nitrogen ambient. The molecular structure of the precursor determined by single crystal X-ray analysis revealed that the molecules are linked through intermolecular hydrogen bonds forming pseudo six and eight membered rings. DSC and TGA/FTIR techniques were used to determine thermal behavior and decomposition temperature of the precursor and nature of evolved gas products. The optical measurement of annealed $ZrO_{2}$ film with tetragonal phase shows optical energy band gap of 5.01 eV. The particle size, morphology, surface structure and composition of deposited films were investigated by XRD, SEM and EDX.
Hussain, Tajammul,Mazhar, Mohammed,Iqbal, Sarwat,Gul, Sheraz,Hussain, Muzammil,Larachi, Faical Korean Chemical Society 2007 Bulletin of the Korean Chemical Society Vol.28 No.7
Hydrogen gas and carbon nanotubes along with nanocarbon were produced from commercial natural gas using fixed bed catalyst reactor system. The maximum amount of carbon (491 g/g of catalyst) formation was achieved on 25% Ni, 3% Cu supported catalyst without formation of CO/CO2. Pure carbon nanotubes with length of 308 nm having balloon and horn type shapes were also formed at 673 K. Three sets of catalysts were prepared by varying the concentration of Ni in the first set, Cu concentration in the second set and doping with K in the third set to investigate the effect on stabilization of the catalyst and production of carbon nanotubes and hydrogen by copper and potassium doping. Particle size analysis revealed that most of the catalyst particles are in the range of 20-35 nm. All the catalysts were characterized using powder XRD, SEM/EDX, TPR, CHN, BET and CO-chemisorption. These studies indicate that surface geometry is modified electronically with the formation of different Ni, Cu and K phases, consequently, increasing the surface reactivity of the catalyst and in turn the Carbon nanotubes/H2 production. The addition of Cu and K enhances the catalyst dispersion with the increase in Ni loadings and maximum dispersion is achieved on 25% Ni: 3% Cu/Al catalyst. Clearly, the effect of particle size coupled with specific surface geometry on the production of hydrogen gas and carbon nanotubes prevails. Addition of K increases the catalyst stability with decrease in carbon formation, due to its interaction with Cu and Ni, masking Ni and Ni:Cu active sites.
Muzammil Hussain,Muhammad Mazhar,Muhammad Khawar Rauf,Masahiro Ebihara,Tajammal Hussain‡ 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.1
A new precursor [Zr(acac)3(H2O)2]Cl was synthesized by Sonochemical technique and used to deposit thin ZrO2 film on quartz and ceramic substrate via ultrasonic aerosol assisted chemical vapour deposition (UAACVD) at 300 °C in oxygen environment followed by annealing of the sample for 2-3 minutes at 500 °C in nitrogen ambient. The molecular structure of the precursor determined by single crystal X-ray analysis revealed that the molecules are linked through intermolecular hydrogen bonds forming pseudo six and eight membered rings. DSC and TGA/FTIR techniques were used to determine thermal behavior and decomposition temperature of the precursor and nature of evolved gas products. The optical measurement of annealed ZrO2 film with tetragonal phase shows optical energy band gap of 5.01 eV. The particle size, morphology, surface structure and composition of deposited films were investigated by XRD, SEM and EDX.
Tajammul Hussain,Mohammed Mazhar,Sarwat Iqbal,Sheraz Gul,Muzammil Hussain,Faical Larachi 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.7
Hydrogen gas and carbon nanotubes along with nanocarbon were produced from commercial natural gas using fixed bed catalyst reactor system. The maximum amount of carbon(491 g/g of catalyst) formation was achieved on 25% Ni, 3% Cu supported catalyst without formation of CO/CO2. Pure carbon nanotubes with length of 308 nm having ballon and horn type shapes were also formed at 673K. Three sets of catalysts were prepared by varying the concentration of Ni in the first set, Cu concentration in the second set and doping with K in the thired set to investigate the effect on stabilization of the catalyst and production of carbon nanotubes and hydrogen by coper and potassium doping. Particle size analysis revealed that most of the ctalyst particled are in the range of 20-35 nm. All the catalysts were characterized using powder XRD, SEM/EDX, TPR, CHN, BET and CO-chemisorption. These studies indicate that surface geometry is modified electronically with the formation of different Ni, Cu and K phases, consequently, increasing the surface reactivity of the catalyst and in turm the Carbon nanotubes/H2 production. The addition of Cu and k enhances the catalyst dispersion with the increase in Ni loadings and maximum dispersion is achieved on 25% Ni: 3% Cu/Al catalyst. Clearly, the effect of particle size couple with specific surface geometry o nthe production of hydrogen gas and carbon nanotubes prevails. Addition of K increases the catalyst stability with decrease in carbon formation, due to its interaction with Cu and Ni, masking Ni and Ni: Cu active sites.
Abdessamad Imoulan,Muzammil Hussain,Paul M. Kirk,Abdellatif El Meziane,Yi-Jian Yao 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.4
Beauveria species are the most common cosmopolitan insect-pathogenic fungi which parasitize over 700 insect species. Since the establishment of the Beauveria genus in 1912 by Vuillemin, its taxonomy status was relied particularly on classical morphological characters. Although easily distinguishable as a genus, species identification remains definitely complicated because of the lack of distinctive morphological features. Furthermore, the extensive overlap in conidia shape and dimensions among Beauveria species has limited their utility as key taxonomic structures. Species identification using only ITS region of rDNA as a DNA barcode reached its resolution limit within Beauveria. Recently, there is a tendency to move towards an integrative multi-locus delimitation system for closely related species. Up until now, a total of 17 Beauveria species have been established essentially reliant on the multi-genes barcode approach of four nuclear genes, i.e., RPB1, RPB2, TEF-1α and intergenic Bloc, adapting genealogical concordance phylogenetic species recognition criterion. This report reviews the taxonomic history of Beauveria species using both morphological and molecular data over the past century.
Keywords and Spatial Based Indexing for Searching the Things on Web
Muhammad R. Faheem,Tayyaba Anees,Muzammil Hussain 한국인터넷정보학회 2022 KSII Transactions on Internet and Information Syst Vol.16 No.5
The number of interconnected real-world devices such as sensors, actuators, and physical devices has increased with the advancement of technology. Due to this advancement, users face difficulties searching for the location of these devices, and the central issue is the findability of Things. In the WoT environment, keyword-based and geospatial searching approaches are used to locate these devices anywhere and on the web interface. A few static methods of indexing and ranking are discussed in the literature, but they are not suitable for finding devices dynamically. The authors have proposed a mechanism for dynamic and efficient searching of the devices in this paper. Indexing and ranking approaches can improve dynamic searching in different ways. The present paper has focused on indexing for improving dynamic searching and has indexed the Things Description in Solr. This paper presents the Things Description according to the model of W3C JSON-LD along with the open-access APIs. Search efficiency can be analyzed with query response timings, and the accuracy of response timings is critical for search results. Therefore, in this paper, the authors have evaluated their approach by analyzing the search query response timings and the accuracy of their search results. This study utilized different indexing approaches such as key-words-based, spatial, and hybrid. Results indicate that response time and accuracy are better with the hybrid approach than with keyword-based and spatial indexing approaches.
Challenges and Issues of Resource Allocation Techniques in Cloud Computing
( Adnan Abid ),( Muhammad Faraz Manzoor ),( Muhammad Shoaib Farooq ),( Uzma Farooq ),( Muzammil Hussain ) 한국인터넷정보학회 2020 KSII Transactions on Internet and Information Syst Vol.14 No.7
In a cloud computing paradigm, allocation of various virtualized ICT resources is a complex problem due to the presence of heterogeneous application (MapReduce, content delivery and networks web applications) workloads having contentious allocation requirements in terms of ICT resource capacities (resource utilization, execution time, response time, etc.). This task of resource allocation becomes more challenging due to finite available resources and increasing consumer demands. Therefore, many unique models and techniques have been proposed to allocate resources efficiently. However, there is no published research available in this domain that clearly address this research problem and provides research taxonomy for classification of resource allocation techniques including strategic, target resources, optimization, scheduling and power. Hence, the main aim of this paper is to identify open challenges faced by the cloud service provider related to allocation of resource such as servers, storage and networks in cloud computing. More than 70 articles, between year 2007 and 2020, related to resource allocation in cloud computing have been shortlisted through a structured mechanism and are reviewed under clearly defined objectives. Lastly, the evolution of research in resource allocation techniques has also been discussed along with salient future directions in this area.