http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Sehar Shahzad Faraooq,Hafiz M W Khalil,Adeel Arif 한국정보과학회 2012 한국정보과학회 학술발표논문집 Vol.39 No.1B
This paper present an intelligent microcontroller based chess playing robot which can play a board game against opponent and calculate its moves in a non-idealized environment. In this work, for the sake of simplicity task is accomplished by using Cartesian coordinate system. Chess playing system has been designed in such a way that it provides an interface between user and robot to control chess movements using RS232. Various algorithms are implemented for interfacing hardware in C++ language. Our main goal is to design a cost effective and highly accurate robot system that consumes minimal power to complete its task.
Prediction and assessment of nonlocal natural frequencies of DWCNTs: Vibration analysis
Sehar Asghar,Muhammad N. Naeem,Muzamal Hussain,Muhammad Taj,Abdelouahed Tounsi 사단법인 한국계산역학회 2020 Computers and Concrete, An International Journal Vol.25 No.2
This paper aims to study vibration characteristics of chiral and zigzag double-walled carbon nanotubes entrenched on Donnell shell model. The Eringen’s nonlocal elastic equations are being combined with Donnell shell theory to observe small scale response. Wave propagation is proposed technique to establish field equations of model subjected to four distinct end supports. A nonlocal model has been formulated to explore the frequency spectrum of both chiral and zigzag double-walled CNTs along with diversity of indices and nonlocal parameter. The significance of scale effect in relevance of length-to-diameter and thickness- to- radius ratios are discussed and displayed in detail. The numerical solution based on this nonlocal Donnell shell model can be further used to predict other frequency phenomena of double-walled and multi-walled CNTs.
Prediction of small-scale vibration of zigzag DWCNTs: Numerical approach
Sehar Asghar,Muzamal Hussain,Mohamed Amine Khadimallah,Muhammad N. Naeem,Zainab Ali,Khaled Mohamed Khedher,Muhammad Taj,Abdelouahed Tounsi 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.39 No.6
In this article, free vibration attributes of zigzag double-walled carbon nanotubes (CNTs) based on nonlocal elastic shell model have been investigated. The impact of small scale is being perceived by establishing Flügge shell model. The wave propagation is engaged to frame the ruling equations as eigen value system. The influence of nonlocal parameter subjected to different end supports has been overtly examined. A suitable choice of material properties and nonlocal parameter been focused to analyze the vibration characteristics. The new set of inner and outer tubes radii investigated in detail against aspect ratio and length. The dominance of boundary conditions via nonlocal parameter is shown graphically. The results generated furnish the evidence regarding applicability of nonlocal shell model and also verified by earlier published literature.
Nonlocal vibration of DWCNTs based on Flügge shell model using wave propagation approach
Sehar Asghar,Muhammad N. Naeem,Muzamal Hussain,Abdelouahed Tounsi 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.34 No.4
In this article, free vibration attributes of double-walled carbon nanotubes based on nonlocal elastic shell model have been investigated. For this purpose, a nonlocal Flügge shell model is established to observe the small scale effect. The wave propagation is employed to frame the governing equations as eigenvalue system. The influence of nonlocal parameter subjected to different end supports has been overtly examined. A suitable choice of material properties and nonlocal parameter been focused to analyze the vibration characteristics. The new set of inner and outer tubes radii investigated in detail against aspect ratio and length. The dominance of boundary conditions via nonlocal parameter is shown graphically. The results generated furnish the evidence regarding applicability of nonlocal shell model and also verified by earlier published literature.
Sehar Mahalakshmi,Thangevel Alagesan,Vellaichamy Parthasarathy,Ramasamy Anbarasan 한국고분자학회 2019 Macromolecular Research Vol.27 No.4
The molybdenum thioglycolate (Mo-TG) end capped poly(ε-caprolactone) (PCL) was prepared in the presence of novel Mo-TG nanohybrid initiator by ring opening polymerization (ROP) technique. The structural analysis was carried out by FTIR, 1H and 13C NMR techniques for the synthesized PCL. The particle size of the end capped Mo-TG nano hybrid in the PCL matrix was analysed by HRTEM. The morphology, surface roughness and average surface roughness of the polymer sample were investigated by AFM. The geometry of the nucleated crystals of PCL was examined using polarized optical microscopy (POM). The crystallization and thermal history of the sample under non-isothermal condition were assessed by DSC and TGA. The morphology of the nucleated crystals was analysed theoretically with the help of kinetic models for Mo-TG end capped PCL under non-isothermal crystallization condition. The kinetic parameters associated with crystallization and degradation processes of PCL were also determined using various kinetic models.
Superior dye degradation using SnO2-ZnO hybrid heterostructure catalysts
Shama Sehar,Iffat Naz,Irum Perveen,Safia Ahmed 한국화학공학회 2019 Korean Journal of Chemical Engineering Vol.36 No.1
We investigated the efficiency of oxide based hierarchical heterostructure as adsorbent for the treatment of organic dyes, Methyl orange (MO) and Methylene Blue (MB), containing solution. Nanocrystals such as ZnO nanorods (at various temperatures of 30, 60 and 75 oC) and SnO2 nanoparticles were synthesized by electrodeposition method and hydrothermal approaches, respectively. SnO2-ZnO heterostructures were formed by spin coating SnO2 nanoparticles on ZnO nanorods matrix to form a heterostructured film. The surface morphologies and structural characterization of as-prepared heterostructures were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM) and X-ray diffraction (XRD) techniques. While, absorption spectra of all samples were examined by UV-vis diffuse reflectance spectroscopy. The photocatalytic activities of as-prepared samples for organic dyes degradation were tested under UV light as model reaction. The SnO2-ZnO heterostructured photocatalyst showed superior activities than individual ZnO and SnO2 nanocrystals. This heightened behavior was attributed to its better charge separation capability and the slow charge recombination originating due to difference in energy values of conduction band edges of SnO2 and ZnO. The SnO2-ZnO heterostructure demonstrated better stability and recyclability up to five times, which is highly desirable for potential industrial applications including dye degradation and wastewater treatment systems.
Shama Sehar,Layla Jassim Hazeem,Iffat Naz,Abdul Rehman,Wuyang Sun,Saleh S. Alhewairini,Ali Salman Bin Thani,Mohammad Salim Akhter,Adnan Younis 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.11
Industrial effluents that contain various toxic substances have polluted our water and soil and posed major health issues. Thus, their removal or conversion to non-toxic products is highly crucial and desirable. This work emphasizes the synthesis of sulfur nanoparticles through precipitation method using anionic and cationic surfactants for exploring its catalytic efficiency in the photocatalytic reduction of hexavalent chromium Cr (VI). As-synthesized sulfur nanoparticles (SNPs) were physically characterized by UV-Vis absorption, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and dynamic light scattering (DLS) measurements. The SNPs prepared using both surfactants have narrow size distribution with great homogeneity (50-80 nm). Moreover, excellent efficiency for Cr (VI) to Cr (III) reduction was recorded for SNPs. Besides, cytotoxicity analysis against microalgae Picochlorum sp. was analyzed and the SNPs showed no negative effect on algal growth and chlorophyll a concentration. Finally, the SNPs were found to provide excellent sunlight protection. Our results highlight that SNPs have great potential for the treatment of industrial wastewater with greater reproducibility. Moreover, they are equally effective against harmful sun rays and are suitable in different skin care products.
Effect of chiral structure for free vibration of DWCNTs: Modal analysis
Asghar, Sehar,Naeem, Muhammad N.,Khadimallah, Mohamed Amine,Hussain, Muzamal,Iqbal, Zafar,Tounsi, Abdelouahed Techno-Press 2020 Advances in concrete construction Vol.9 No.6
In this paper, vibration attributes of chiral double-walled carbon nanotubes (CNTs) based on nonlocal elastic shell model have been investigated. The impact of small scale is being perceived by establishing Flügge shell model. The wave propagation is engaged to frame the ruling equations as eigen value system. The influence of nonlocal parameter subjected to different end supports has been overtly examined. A suitable choice of material properties and nonlocal parameter been focused to analyze the vibration characteristics. The new set of inner and outer tubes radii investigated in detail against aspect ratio and length. The dominance of boundary conditions via nonlocal parameter is shown graphically. Whereas for lower aspect ratio the frequencies coincide but as it continues to expand the difference between all respective boundary conditions slightly tend to increase. The results generated furnish the evidence regarding applicability of nonlocal shell model and also verified by earlier published literature.