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检索条件"任意字段=8th International Conference on Modeling Simulation and Applied Optimization, ICMSAO 2019"

共 199 条记录，以下是31-40 订阅

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Fluid-structural interaction simulation of vortices behind a flexible vortex generator 8

Fluid-structural interaction simulation of vortices behind a...

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8th international conference on modeling simulation and applied optimization, icmsao 2019

作者： Dol, Sharul Sham Bin, Chan Hiang Department of Mechanical Engineering Abu Dhabi University Abu Dhabi United Arab Emirates Department of Mechanical Engineering Curtin University Malaysia CDT 250 Miri Sarawak98009 Malaysia

ISBN: (纸本)9781538676844

this paper computationally studied the strength of wake structures behind a free-oscillating flexible vortex generator (FVG) by computing the circulation around the FVG using Fluid-Structural Interaction (FSI) simulation of RANS (SST) k-ω model. the amount of circulation found that the vortex generated by the FVG is stronger than those generated by the rigid vortex generator (RVG). this result has demonstrated that the FVG has a better turbulence generation ability compared to the RVG, suggesting improved energy transport for better heat transfer rate or improving aerodynamics performance. In addition., the result of the analysis was used to justify the proposed flow model for stronger turbulence phenomenon. According to the model, the case with greater structural velocity will result in a greater shear or circulation. For this purpose, the structural velocity was computed and the result demonstrates an excellent agreement with the model's prediction. this has further strengthened the reliability of the proposed model. © 2019 IEEE.

关键词： Vortex flow

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modeling of distribution transformer for analysis of core losses of different core materials using FEM 8

Modeling of distribution transformer for analysis of core lo...

引用

8th international conference on modeling simulation and applied optimization, icmsao 2019

作者： Dawood, Kamran Komurgoz, Guven Isik, Fatih Electrical Engineering Department Istanbul Technical University Istanbul Turkey Research Development Astor Transformers Ankara Turkey

ISBN: (纸本)9781538676844

the core losses of the transformer are mainly dependent on the material of the transformer core. the material of the transformer core just not minimize the cost of the core losses but also increase the lifetime of the transformer. M5 material cold rolled grain oriented silicon steel is generally used for the manufacturing of the core of the transformer. In this study, 2- dimensional finite element models are used to determine the core losses of the transformer. M5 and M4 cold rolled grain oriented silicon steel materials were used for the manufacturing of the transformer core. In this study, a core loss of the three phase distribution transformer with a power of 400 kVA and a voltage level of 30/0.4 kV was investigated and the results presented in this paper are based on the finite element analysis. the results show that the core losses in the M4 cold rolled grain oriented silicon steel material are lesser than the M5 core material. For validation, the results of the finite element results are compared with the experimental results. © 2019 IEEE.

关键词： Finite element method

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Design and optical simulation of a sensor pixel for an optical readout-based thermal imager 8

Design and optical simulation of a sensor pixel for an optic...

引用

8th international conference on modeling simulation and applied optimization, icmsao 2019

作者： Odebowale, Ambali Alade Abdel-Rahman, Mohamed Electrical Engineering Department College of Engineering King Saud University Riyadh11421 Saudi Arabia

ISBN: (纸本)9781538676844

In this paper, we present an optical design and analysis of a single pixel element detector in an optical readout-based infrared imaging system. the proposed thermal imaging system contains no readout integrated circuitry and thus can be considered as a low cost alternative to typical thermal imaging systems. In this paper, we present the design and optical simulation details for a fabry perot cavity filter (FPCF)-based sensor configuration operating in the transmission mode at 650nm and as a Long Wave Infrared (LWIR) absorber in the 8000nm-12000nm band. the temperature tuning of the FPCF resonant frequency is dependent on the thermo-optic sensitivity of its cavity layer. the performance of the FPCF sensor is considered at different cavity layer thermo-optic coefficients (TOCs) and for different thermal scene temperature variations. the proposed sensor was found to be sensitive to 25mK thermal scene temperature variations. © 2019 IEEE.

关键词： Optical design

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Fractional derivative modeling of free convective flow over a vertical plate with stability analysis 8

Fractional derivative modeling of free convective flow over ...

引用

8th international conference on modeling simulation and applied optimization, icmsao 2019

作者： El-Amin, Mohamed F. Radwan, Ahmed G. Kou, Jisheng Salama, Amgad College of Engineering Effat University Jeddah Saudi Arabia Department of Engineering Mathematics Faculty of Engineering Cairo University Cairo Egypt School of Mathematics and Statistics Hubei Engineering University Xiaogan China University of Regina Regina Canada

ISBN: (纸本)9781538676844

the problem fractional derivative of flow and heat transfer by natural convection from a heated semi-infinite wall immersed in a fluid is studied numerically. the time derivative terms in both the momentum and energy equations are assumed fractional. Fractional derivative is a generalization to the normal derivative and it would be interesting to study its possible effects on both velocity and temperature fields. For accurate implementation, it is important that the results obtained by fractional derivative formulations reduce to the results obtained by normal derivative when the order of differentiation becomes the same. In this work, it is found that both the velocity and temperature profiles using fractional derivatives around first order (i.e., smaller and larger than one) encompass those obtained using first order time derivative. Nusselt number variations as well as friction coefficient profiles follow a similar pattern. © 2019 IEEE.

关键词： Natural convection

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Comparisons and appropriate solutions to prevent data threats of cloud computing, applied in green environment 8

Comparisons and appropriate solutions to prevent data threat...

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8th international conference on modeling simulation and applied optimization, icmsao 2019

作者： Alsadoon, Ghossoon AMA International University Salmabad Bahrain

ISBN: (纸本)9781538676844

Cloud computing security or online storage is an E-business that provides mass storage solutions in return for a periodic set fee. Such services enable individuals to store or upload content over a secure, established network of remote servers hosted on the internet to store, manage, and process data, as an alternative to a local server or a personal computer, to avoid the risk of potential loss of vital information without the need to manually or periodically back up data. Due to the shared nature of the network, the main priority is the privacy and protection of organization data utilizing cloud computing. With an increase of individuals and organizations using cloud services, appropriate cloud security is mandatory to avoid potential in an organization. the researcher conducted online survey and distributed for deferent academic staff and university students to check the legacy of the privacy and find the appropriate solutions using statistic tools such as correlation measurement. One of the key challenges in cloud computing is how to protect stored information from hacking and maintain a high quality of performance in the cloud computing environment. Several different topics are raised in discussions about cloud computing, such as data, privacy, infected applications, and security. this paper discusses different approaches to protecting information and preventing unauthorized access to data, application of cloud computing to keep data safe data and the make an environment green. © 2019 IEEE.

关键词： Cloud security

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Solar powered battery-less portable RO desalination unit: simulation studies 8

Solar powered battery-less portable RO desalination unit: Si...

引用

8th international conference on modeling simulation and applied optimization, icmsao 2019

作者： Kandathil, Anoop Kumaran Mansour, Noureddine Sreedharan, Sreejith Taleb, Maamar Chemical Engineering Department University of Bahrain Isa Town Bahrain Electrical and Electronic Engineering Department University of Bahrain Isa Town Bahrain

ISBN: (纸本)9781538676844

Due to the promising technical feasibility of PV powered RO unit, many studies worldwide are carried out to further enhance their performance. In this simulation studies, we investigate the performance and efficiency of a battery free portable PV-RO unit powered directly and continuously from the PV array and compare it to the performance of a solar battery driven RO unit. the solar battery is charged during daytime using the PV array and runs the RO setup during nighttime. However, the energy provided by the PV array is intermittent and depends on daily available irradiations. Fortunately, in the case of the battery less unit the energy consumption of the RO unit can be adjusted by manipulating the brine flow rate or/and system pressure. In this work, we discuss two techniques for automatic adjustment of RO parameter (e.g. valve position at the brine) so that RO power consumption matches the maximum power provided by PV arrays. Matlab/Simulink implementations performed in these studies are presented and simulation results of battery less PV-RO system driven by UM and solar battery driven RO system are presented and compared. © 2019 IEEE.

关键词： Desalination

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modeling the dipolar interaction field distributions in random superparamagnetic system 8

Modeling the dipolar interaction field distributions in rand...

引用

8th international conference on modeling simulation and applied optimization, icmsao 2019

作者： Nasser, Layla S. El-Hilo, M. Alsaei, J. Department of Physics University of Bahrain Sakhir Bahrain

ISBN: (纸本)9781538676844

Dipolar interactions in a system of superparamagnetic nanoparticles play an important role in the magnetic response of the system, where it is well known that they depress the magnetisation. In this study, we simulate a system of 5000 interacting nanoparticles using Metropolis Monte Carlo method. In such system, it is known that the dipolar interactions adopt Gaussian distribution with approximately zero mean and with varying standard deviation depending on the external applied field and the packing density. In this study we comprehensively investigate the effect of the packing density on the standard deviation of the interaction fields at different applied fields. We provide an empirical formula that combines the two factors and show that it gives magnetisation curves that are in a very good agreement to actual Monte Carlo simulations. Furthermore, the individual effects of the interaction fields along each direction are investigated using the developed empirical formula. Our results show that the longitudinal and the transverse components do not contribute linearly to the overall depression of magnetisation (i.e., the sum of the individual reductions in magnetisation of each component does not add up to the total reduction due to the combined effect of all components). We tried to explain this by showing theoretically that the reduction in magnetisation due to the longitudinal components is, to a first order approximation, directly proportional to the curvature of the magnetisation curve of the noninteracting system. However, the reduction due to the transverse components does not show this behaviour. © 2019 IEEE.

关键词： Magnetization

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optimization of transportation collaborative robots fleet size in flexible manufacturing systems 8

Optimization of transportation collaborative robots fleet si...

引用

8th international conference on modeling simulation and applied optimization, icmsao 2019

作者： Sahnoun, M'Hammed Xu, Yiyi Abdelaziz, Fouad Ben Baudry, David LINEACT Laboratory CESI 1 Rue G. Marconi M.S. Aignan76130 France Neoma Business School 1 Rue du Maréchal Juin M.S. Aignan76130 France

ISBN: (纸本)9781538676844

the current economic context is uncertain and highly competitive, where companies seek to reduce their production cost and adapt production systems to market needs. Since consumer behaviour becomes more and more unpredictable within shorter and shorter product lifetime, flexible manufacturing systems are introduced to allow company to adapt their production to the market without changing systems. the inherent painful and repetitive transportation activities are central in such workshop, where all other activities, like production and maintenance, are impacted by the transportation task. Recently, more and more collaborative mobile robots fleet are used to ensure this activity. therefore, the fleet size is necessary to be optimized to reduce costs while avoiding delays. In this paper, we propose a decision making tool based on a multi-agent simulation to help decision makers to find the optimal robot fleet size of transportation robots. © 2019 IEEE.

关键词： Flexible manufacturing systems

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Numerical modeling of nanofluids flow and heat transfer in a porous cavity 8

Numerical modeling of nanofluids flow and heat transfer in a...

引用

8th international conference on modeling simulation and applied optimization, icmsao 2019

作者： El-Amin, Mohamed F. Abdel-Naeem, Shereen Ebrahiem, Nehma A. College of Engineering Effat University Jeddah Saudi Arabia Mathematics Department Faculty of Science Aswan University Aswan Egypt

ISBN: (纸本)9781538676844

the present article investigates the non-isothermal nanofluids flow in a squared porous cavity. the model consists of the conservation laws of energy, momentum, and mass. the cavity boundaries are modeled by mixed Dirichlet-Neumann boundary conditions. the discretization of time derivatives is developed by a time-splitting multiscale technique. the momentum and continuity equations are solved implicitly to find the pressure, then the velocity of the field is explicitly calculated. therefore, both energy equation is solved implicitly. the Courant-Friedrichs-Lewy condition has been used to achieve the time step-size adaptation. Two numerical cases are considered for different boundary conditions. the effects of the nanofluid volume fraction of the on pressure, velocity, temperature and Nusselt number have been investigated. It was found that the temperature decreases as the volume fraction increases. We also found that the pressure and velocity increase while the local Nusselt number decreases as the volume fraction increases. © 2019 IEEE.

关键词： Volume fraction

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SPARQL2Hive: An approach to processing SPARQL queries on Hive based on meta-models 8

SPARQL2Hive: An approach to processing SPARQL queries on Hiv...

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8th international conference on modeling simulation and applied optimization, icmsao 2019

作者： Banane, Mouad Erraissi, Allae Belangour, Abdessamad Laboratory of Information Technology and Modeling Hassan 2 University Casablanca Morocco

ISBN: (纸本)9781538676844

the growth of Web data has presented new challenges in terms of the ability to effectively query RDF data. Traditional relational database systems efficiently adapt and query distributed data. With the development of Hadoop, its implementation of the MapReduce Framework with Hive, a data warehouse, the semantics of data processing and querying has changed. We present in this article, SPARQL2Hive a competitive SPARQL Query Processing System on MapReduce that allows ad hoc SPARQL query processing on large RDF graphs. Instead of a direct mapping, SPARQL2Hive uses the query language of Hive, a data warehouse system that queries systems using HDFS, located above Hadoop MapReduce, as an intermediate layer between SPARQL and MapReduce. this additional level of abstraction makes our approach independent of the current version of Hadoop and thus ensures compatibility with future changes to the Hadoop framework as they will be covered by the underlying Hive layer. Our approach is to use the two meta-models of SPARQL and Hive, and propose a transformation between these two meta-models using the ATL language. We compare SPARQL2Hive with MapReduce-based SPARQL implementations. © 2019 IEEE.

关键词： MapReduce

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