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- 저자 : Muhammad Shoaib (검색결과 64 건)
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Muhammad Bilal,Shoaib FREED,Saleh MUHAMMAD,Muhammad Zubair ASHRAF,Muhammad Bismillah KHAN 한국곤충학회 2018 Entomological Research Vol.48 No.4
Helicoverpa armigera, a polyphagous insect of crops and vegetables, is acquiring resistance against many commercial insecticides. The present study shows variations in the activity of two detoxification enzymes, namely esterase and glutathione S‐transferase (GST), in H. armigera after exposure to different isolates of entomopathogenic fungi. After treatment of larvae with the different isolates (Day 0), samples were collected on three days (Days 3, 5 and 7) for enzyme analysis. High GST activity was found in samples of hemolymph, intestine and fat bodies of H. armigera following treatment with Beauveria bassiana (isolate Bb‐08), Metarhizium anisopliae (isolates Ma‐11.1 and Ma‐4.1), and Isaria fumosorosea (isolates If‐02 and If‐2.3). High esterase activity was recorded in samples of the intestine and fat bodies on various days after treatment, whereas increased esterase activity in hemolymph was noted only in samples from Day 5 after treatment with M. anisopliae (Ma‐4.1). The detection of high GST and esterase activity demonstrates the possibility of the development of resistance against these microbial control agents in H. armigera.
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Muhammad Shoaib Bhutta,Tang Xuebang,Shakeel Akram,Chen Yidong,Xiancheng Ren,Muhammad Fasehullah,Ghulam Rasool,Muhammad Tariq Nazir 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-
Graphene and its oxides are the most extensively studied, fascinating 2-dimensional Sp2 carbon hybridizedmaterials. Due to its superior and excellent thermal conductivity, it is considered to be a practicalsolution for the thermal dissipation of electric machines electronic components. Furthermore, grapheneoxide invariably reduces electrical insulation capability, which is inappropriate for electrical machinesrequiring low electrical and high thermal conductivity. Therefore, we have created 2D-3D hybrid grapheneoxide (GO)-diamond (DM) micro-composite polyimide (PI) films for high temperature and electricallyinsulated environments of electric machines such as motors and generators. With a modest fillingcharge of 10 wt% GO with 10% diamond (DM), the maximum thermal conductivity of 1.83 Wm-1K1 isachieved for polyimide micro composite and is almost 11 times higher than that of pristine PI films. The 10% PI/GO/DM micro composite films also show lower electrical conductivity than other samples. Hybrid fillers with high thermal and low electrical conductivities are responsible for synergistic improvementsin experimental results.
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Muhammad Altaf Nazir,Tayyaba Najam,Muhammad Sohail Bashir,Muhammad Sufyan Javed,Muhammad Aswad Bashir,Muhammad Imran,Umair Azhar,Syed Shoaib Ahmad Shah,Aziz ur Rehman 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.1
The use of highly efficient, environment-friendly and economically inexpensive materials for the adsorption removal of contaminants from water has always been considered as emerging task. In this study, we synthesized hybrid tri-metallic nickel cobalt layered double hydroxide (NiCoAl-LDH) porous material for the adsorption removal of Eosin yellow (EY) and Malachite green (MG) from water. The characterization results disclosed that tri-metallic LDH has been synthesized with extraordinary purity, identical morphology and high surface area (134.21 m2·g−1). The NiCoAl-LDH performs the best for adsorption of EY (qe=37.30mg·g−1 at pH=2) and MG (qe=39.61 mg·g−1 at pH=10). The Langmuir and Freundlich isotherm models were applied to explain the adsorption process of dyes on the surface of LDH. The Langmuir model (R2=0.991 and 0.999 for Eosin Y and Malachite G, respectively) was very appropriate to explain the process of adsorption on NiCoAl-LDH as homogeneous (monolayer). The maximum adsorption capacity of EY and MG calculated with Langmuir model was 78.74 and 110.13 mg·g−1 at 30 °C, respectively. Also with 240 minutes contact time 94.8% EY and 89.9% MG was adsorbed by as synthesized NiCoAl-LDH nanosheets. The NiCoAl-LDH nanosheets showed excellent performance of reusability of up to five regeneration cycles. The results showed that the adsorption capacity of NiCoAl-LDH nanosheets after five regeneration cycles, to adsorb EY, decreased only from 40.80 to 36.93 mg·g−1 and that of MG from 79.21 to 75.42 mg·g−1, which is acceptable. The overall results Suggest that the fabricated NiCoAl-LDH is favorable for the purification of dye contaminated water.
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An Autonomous Configuration Management Architecture for Wireless Sensor Networks
Muhammad Shoaib Siddiqui,Choong Seon Hong 한국정보과학회 2010 한국정보과학회 학술발표논문집 Vol.37 No.2B
This paper discusses the configuration management for the autonomic sensor network management, which is enabled by using a middleware. The detailed mechanism is discussed and scenarios for configuration management are also provided. Convergence time for the reconfiguration of the sensor nodes is also calculated using a mathematical model and simulations.
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Muhammad Nabeel,Muhammad Ali Nasir,Mariyam Sattar,Rizwan Ahmed Malik,Meshal Alzaid,Muhammad Shoaib Butt,Mohsin Saleem,Hussein Alrobei 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.11
Flexural, tensile, and impact strength of hybrid Kevlar/glass reinforced epoxy composite is studied. Six different types of hybrid composite material were manufactured by hand layup process using different compositions of Kevlar and glass fiber. Tensile, flexural and impact strengths of manufactured samples were investigated using standard tests and compared. It is observed that tensile strength is greater for combinations with higher percentage (%) of Kevlar fabric and decreases with an increase in the glass fabric %age. Flexural strength is higher for combinations with greater %age of glass fabric and decreases with an increase in the Kevlar fabric %age. From drop weight test, it is found from visual inspection that damaged area is increased with an increase in the glass fabric percentage. Numerical simulation model incorporated with elastoplastic material data successfully predicts tensile and flexural experimental results.
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Muhammad, Shoaib,Lee, Sangwoo,Kim, Hyunchul,Yoon, Jeongbae,Jang, Donghyuk,Yoon, Jaegu,Park, Jin-Hwan,Yoon, Won-Sub Elsevier 2015 Journal of Power Sources Vol.285 No.-
<P><B>Abstract</B></P> <P>Thermal stability is one of the critical requirements for commercial operation of high energy lithium-ion batteries. In this study, we use <I>in situ</I> X-ray diffraction technique to elucidate the thermal degradation mechanism of 0.5Li<SUB>2</SUB>MnO<SUB>3</SUB>-0.5LiNi<SUB>0.33</SUB>Co<SUB>0.33</SUB>Mn<SUB>0.33</SUB>O<SUB>2</SUB> lithium rich cathode material in the absence and presence of electrolyte to simulate the real life battery conditions and compare its thermal behavior with the commercial LiNi<SUB>0.33</SUB>Co<SUB>0.33</SUB>Mn<SUB>0.33</SUB>O<SUB>2</SUB> cathode material. We show that the thermal induced phase transformations in delithiated lithium rich cathode material are much more intense compared to similar single phase layered cathode material in the presence of electrolyte. The structural changes in both cathode materials with the temperature rise follow different trends in the absence and presence of electrolyte between 25 and 600 °C. Phase transitions are comparatively simple in the absence of electrolyte, the fully charged lithium rich cathode material demonstrates better thermal stability by maintaining its phase till 379 °C, and afterwards spinel structure is formed. In the presence of electrolyte, however, the spinel structure appears at 207 °C, subsequently it transforms to rock salt type cubic phase at 425 °C with additional metallic, metal fluoride, and metal carbonate phases.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Thermal degradation mechanism of lithium rich electrode material is investigated. </LI> <LI> In the absence of electrolyte, LMC shows better thermal stability compared to NMC. </LI> <LI> In the presence of electrolyte, thermal decomposition of LMC is accelerated. </LI> <LI> Catalytic activity of electrolyte in thermal decomposition is electrode dependent. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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( Muhammad Shoaib Siddiqui ),( Choong Seon Hong ) 한국인터넷정보학회 2012 KSII Transactions on Internet and Information Syst Vol.6 No.3
Set-top Box (STB) has evolved from being a device just sitting on top of a TV shelf to a device providing a gateway to the Internet for a home network, receiving services from multiple content providers, and enabling and ensuring Quality of Service (QoS) for the streaming media. IP Multimedia Subsystem (IMS), with its promise to provide a converged access network for multimedia service delivery (such as Triple play & Quadruple play services), has to guarantee QoS support. To enable QoS in IMS-based networks, we have designed a set-top box which provides feedback to the service provider to ensure end-to-end QoS. Our set-top box is designed to provide virtual platforms such that it can support multiple service providers. Each service provider is able to manage its own multimedia streams and ensures the desired network performance for each flow. The set-top box also works as a Home Gateway and provides end-to-end QoS support to the client nodes.
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Modeling and preparation of practical optical filters
Muhammad H. Asghar,Muhammad Shoaib,Frank Placido,Shahzad Naseem 한국물리학회 2009 Current Applied Physics Vol.9 No.5
Multilayer bandpass and bandstop filters have been produced using electron beam evaporation. Initially bandstop filter is modeled with non absorbing zinc sulphide (ZnS) and zinc selenide (ZnSe). When the absorption data was incorporated for the said materials significant absorption was observed at shorter wavelengths of the spectral band restricting the practical usage of the filter. ZnS and ZnSe were then replaced by dispersive silicon dioxide (SiO2), tantalum penta oxide (Ta2O5) and titanium dioxide (TiO2) along with their absorption and the filters are optimized to get desired bandpass and bandstop data. Bandpass and bandstop filters with desired performance were experimentally characterized with two combinations SiO2/Ta2O5/glass and SiO2/TiO2/glass. The measured average transmission for both combination (bandpass) in the pass band was about 92% with T < 1% in the stop band. Slightly narrow bandwidth was observed for SiO2/TiO2/glass as compared to SiO2/Ta2O5/glass which is attributed to layers densification. Similarly Tavg ≽ 80% was achieved for two combinations of bandstop filters with T < 0.1% in the stop band. The structure and surface morphology of the prepared filters were characterized by X-ray diffraction and scanning electron microscopy. XRD analysis reveals amorphous structure. SEM analysis also reveals that the layers are compact and have good surface quality. Multilayer bandpass and bandstop filters have been produced using electron beam evaporation. Initially bandstop filter is modeled with non absorbing zinc sulphide (ZnS) and zinc selenide (ZnSe). When the absorption data was incorporated for the said materials significant absorption was observed at shorter wavelengths of the spectral band restricting the practical usage of the filter. ZnS and ZnSe were then replaced by dispersive silicon dioxide (SiO2), tantalum penta oxide (Ta2O5) and titanium dioxide (TiO2) along with their absorption and the filters are optimized to get desired bandpass and bandstop data. Bandpass and bandstop filters with desired performance were experimentally characterized with two combinations SiO2/Ta2O5/glass and SiO2/TiO2/glass. The measured average transmission for both combination (bandpass) in the pass band was about 92% with T < 1% in the stop band. Slightly narrow bandwidth was observed for SiO2/TiO2/glass as compared to SiO2/Ta2O5/glass which is attributed to layers densification. Similarly Tavg ≽ 80% was achieved for two combinations of bandstop filters with T < 0.1% in the stop band. The structure and surface morphology of the prepared filters were characterized by X-ray diffraction and scanning electron microscopy. XRD analysis reveals amorphous structure. SEM analysis also reveals that the layers are compact and have good surface quality.
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