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- 저자 : Ayub (검색결과 116 건)
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Toward High-performance Quinoxaline Based Unfused Non-fullerene Acceptors for Organic Solar Cells
Amna Ayub,Muhammad Ans,Sehrish Gul,Ahmed M. Shawky,Khurshid Ayub,Javed Iqbal,Muhammad Ali Hashmi,Ahmed Lakhani 대한금속·재료학회 2023 ELECTRONIC MATERIALS LETTERS Vol.19 No.1
Unfused non-fullerene acceptors with the advantages of simple synthesis, high yields, and low cost have received a lot ofinterest in recent years. Herein, we designed fi ve structures (UF-M1–UF-M5) with unfused non-fullerene acceptors coupledto electron-defi cient quinoxaline (Qx) as the core unit via electron-donating cyclo-penta-dithiophene (CPDT) as the conjugatedbackbone by modifi cation in UF-Qx-2Cl taken as reference. Among all, mPW1PW91 method predicted λ max closestto the λ max of UF-Qx-2Cl, so we implemented the mPW1PW91 method with a 6-31G(d,p) basis set for the optimization ofdesigned geometries and their molecular electrostatic mapping (MEP). Further parameters like FMOs (frontier molecularorbitals), TDM (transition density matrix analysis), DOS (density of state analysis), electron–hole mobility rate (reorganizationenergies), dipole moment, and chemical quantum descriptive parameters were evaluated for organic photovoltaics. Among all, UF-M4 predicted better absorption in the gaseous and solvent phase (λ max = 726 nm and 789 nm respectively),lower bandgap (E g = 2.03 eV), higher dipole moment (1.99 and 5.33 debye in gaseous and solvent phase respectively), betterquantum chemical descriptive parameters, and higher electron mobility rate (λ e = 0.00766 eV). The results reveal that theacceptor molecule UF-M4 that has been created performs better in studies and better opportunities for organic-photovoltaics. To summarize, the unfused non-fullerene-based acceptor modifi cation technique has shown eff ective in paving the way forthe development of promising photovoltaic materials. All currently projected acceptor contributors (UF-M1–UF-M5) shouldbe targeted to produce future competent organic photovoltaics.
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Connection Frequency Buffer Aware Routing Protocol for Delay Tolerant Network
Ayub, Qaisar,Mohd Zahid, M. Soperi,Abdullah, Abdul Hanan,Rashid, Sulma The Korean Institute of Electrical Engineers 2013 Journal of Electrical Engineering & Technology Vol.8 No.3
DTN flooding based routing protocol replicate the message copy to increase the delivery like hood that overloads the network resources. The probabilistic routing protocols reduce replication cost by forwarding the message to a node that holds high predictability value to meet its destination. However, the network traffic converges to high probable nodes and produce congestion that triggers the drop of previously stored messages. In this paper, we have proposed a routing protocol called as Connection frequency Buffer Aware Routing Protocol (CFBARP) that uses an adaptive method to maintain the information about the available buffer space at the receiver before message transmission. Furthermore, a frequency based method has been employed to determine the connection recurrence among nodes. The proposed strategy has performed well in terms of reducing message drop, message relay while increases the delivery probability.
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Effect of impurities on ultra-pure hydrogen production by pressure vacuum swing adsorption
Ayub Golmakani,Seyed Ali Nabavi,Vasilije Manovi 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.82 No.-
The most viable technology for production of ultra-pure hydrogen (>99.99%), required for fuel cells, issteam methane reforming (SMR) coupled with pressure vacuum swing adsorption (PVSA). A PVSAprocess with a two-layer bed of activated carbon (AC)/zeolite 5A for ultra-pure hydrogen production fromsyngas was developed and simulated with the aim of exploring the effect of impurities on energyintensity of the process. The simulated concentration profiles showed that CH4 was removed by thefirsthalf of the AC layer, CO2 and CO were mostly removed by the end of that layer, but zeolite 5A (the secondlayer) could not completely remove the remaining N2. Further, the effect of the N2 on performance of thePVSA process was demonstrated by simulating purification of two feeds with 3.1 and 1.1 vol% N2,respectively. The 2% drop in N2 concentration in the syngas feed resulted in decreased energyconsumption of the PVSA process from 940 kJ/kg to 430 kJ/kg H2, while H2 recovery increased from 47% to55%. Therefore, the presence of N2 has a very large impact on recovery and energy intensity of the ultrapurehydrogen production process, and development of adsorbents with better N2 removal performanceis required.
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Emotion Graph Models for Bipedal Walk Cycle Animation
Ayub bin Abdul Rahman,Dr. Normaziah Abdul Aziz,Dr. Syarqawi Hamzah 국제문화기술진흥원 2016 International Journal of Advanced Culture Technolo Vol.4 No.1
Technology in the animation industry has evolved significantly over the past decade. The tools to create animation are becoming more intuitive to use. Animators now spend more time on the artistic quality of their work than wasting time figuring out how to use the software that they rely on. However, one particular tool that is still unintuitive for animators is the motion graph editor. A motion graph editor is a tool to manipulate the interpolation of the movements generated by the software. Although the motion graph editor contains a lot of options to control the outcome of the animation, the emotional rhythm of the movements desired by the animator still depends on the animator’s skill, which requires a very steep learning curve. More often than not, animators had to resort to trial and error methods to achieve good results. This inevitably leads to slow productivity, susceptible to mistakes, and waste of resources. This research will study the connection between the motion graph profile and the emotions they portray in movements. The findings will hopefully be able to provide animators reference materials to achieve the emotional animation they need with less effort.
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Critical Analysis of Cloud Computing Software Development Process Models
Ayub Khan,Muhammad Fayaz,Abdul Salam Shah,Fazli Wahid 보안공학연구지원센터 2016 International Journal of Software Engineering and Vol.10 No.11
Nowadays, every vendor and IT service provider wants to switch into a cloud environment for better Quality of Service (QoS), Scalability, Performance and reasonable Cost. Many software developers trying to get the benefits of cloud computing and want to access the cloud environments at low cost and easy access. For this rationale and real-time cloud services, a reliable virtual platform is required. Many issues are encountering in development and deployment of these platforms regarding programming models, application architecture, APIs and services it provided. On the other hand, there are too many issues on the client side, including the limitation of tools, the interaction between client and service provider and user requirements in a specific cloud. As the cloud is inherently distributed environment, so it fabricates gaps in communication and coordination between stack holders. To cope with these obstacles and overcome challenges during software development in Cloud Computing, it is necessary to have a framework which resolves the issues and develop the software process model which meet the user requirement and provide quality of services within a time and budget. In this paper, the literature review mainly focuses on the software process model with their strength and weakness. The literature review also analyzes some attributes for software life cycle including cost, time, scalability and QoS.
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Ayub Elyasi,Taher Moradi,Javad Moharrami,Saeid Parnian,Akbar Mousazadeh,Sepideh Nasseh 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.57 No.6
Tunneling is one of the challenging tasks in civil engineering because it involves a variety of decision making and engineering judgment based on knowledge and experience. One of the challenges is to construct tunnels in risky areas under shallow overburden. In order to prevent the collapse of ceilings and walls of a large tunnels, in such conditions, either a sequential excavation method (SEM) or ground reinforcing method, or a combination of both, can be utilized. This research deals with the numerical modeling of L-profiles and pipe fore-poling pre-support systems in the adit tunnel in northwestern Iran. The first part of the adit tunnel has been drilled in alluvial material with very weak geotechnical parameters. Despite applying an SEM in constructing this tunnel, analyzing the results of numerical modeling done using FLAC3D, as well as observations during drilling, indicate the tunnel instability. To improve operational safety and to prevent collapse, pre-support systems, including pipe fore-poling and L-profiles were designed and implemented. The results of the numerical modeling coupled with monitoring during operation, as well as the results of instrumentation, indicate the efficacy of both these methods in tunnel collapse prevention. Moreover, the results of modeling using FLAC3D and SECTION BUILDER suggest a double angle with equal legs (2L100×100×10 mm) in both box profile and tee array as an alternative section to pipe fore-poling system while neither L80×80×8 mm nor 2L80×80×8 mm can sustain the axial and shear stresses exerted on pipe fore-poling system.
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Ayub Elyasi,Kamran Goshtasbi,Hamid Hashemolhosseini,Sharif Barati 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.59 No.1
Reservoir geomechanics can play an important role in hydrocarbon recovery mechanism. In CO2-EOR process, reservoir geomechanics analysis is concerned with the simultaneous study of fluid flow and the mechanical response of the reservoir under CO2 injection. Accurate prediction of geomechanical effects during CO2 injection will assist in modeling the Carbon dioxide recovery process and making a better design of process and production equipment. This paper deals with the implementation of a program (FORTRAN 90 interface code), which was developed to couple conventional reservoir (ECLIPSE) and geomechanical (ABAQUS) simulators, using a partial coupling algorithm. A geomechanics reservoir partially coupled approach is presented that allows to iteratively take the impact of geomechanics into account in the fluid flow calculations and therefore performs a better prediction of the process. The proposed approach is illustrated on a realistic field case. The reservoir geomechanics coupled models show that in the case of lower maximum bottom hole injection pressure, the cumulative oil production is more than other scenarios. Moreover at the high injection pressures, the production rates will not change with the injection bottom hole pressure variations. Also the FEM analysis of the reservoir showed that at CO2 injection pressure of 11000 Psi the plastic strain has been occurred in the some parts of the reservoir and the related stress path show a critical behavior.
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