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Πλοήγηση ανά Θέμα "Numerical results"

Αποτελέσματα 21-40 από 46

    • Hybrid data pricing for network-assisted user-provided connectivity 

      Gao, L.; Iosifidis, G.; Huang, J.; Tassiulas, L. (2014)
      User-provided connectivity (UPC) is a promising paradigm to achieve a low-cost ubiquitous connectivity. In this paper, we study a network-assisted UPC service model, where a mobile virtual network operator (MVNO) enables ...

    • Illumination, data transmission, and energy harvesting: The threefold advantage of VLC 

      Sandalidis H.G., Vavoulas A., Tsiftsis T.A., Vaiopoulos N. (2017)
      Visible light communication (VLC) is a promising technology that meets illumination and information transmission requirements in an indoor environment. Because light waves convey energy, a VLC link may exploit that fact ...

    • Incentive mechanisms for hierarchical spectrum markets 

      Iosifidis, G.; Chorppath, A. K.; Alpcan, T.; Koutsopoulos, I. (2012)
      We study spectrum allocation mechanisms in hierarchical multi-layer markets which are expected to proliferate in the near future according to the evolving spectrum policy reform proposals. We consider the scenario that ...

    • Information-Centric Connectivity 

      Katsaros K.V., Sourlas V., Psaras I., Rene S., Pavlou G. (2016)
      Mobile devices are often presented with multiple connectivity options, usually making a selection either randomly or based on the wireless medium's conditions, as is the case for current offloading schemes. In this article ...

    • Lattice kinetic schemes in toroidal geometry 

      Breyiannis, G.; Valougeorgis, D. (2006)
      Lattice kinetic schemes has been consistently developed for the last 15 years as a tool to tackle complicated problems from a mesoscopic perspective. The system is described by a velocity distribution function, which follows ...

    • A Learning-Based Spectrum Access Stackelberg Game: Friendly Jammer-Assisted Communication Confrontation 

      Qi N., Wang W., Xiao M., Jia L., Jin S., Zhu Q., Tsiftsis T.A. (2021)
      Defensive and offensive capabilities are both significant in communication confrontation games. By exploiting the above two capabilities, a new confrontation mechanism in the spectrum domain between two opposing teams ...

    • Mechanical behavior of buried steel pipelines crossing strike-slip seismic faults 

      Vazouras, P.; Karamanos, S. A.; Dakoulas, P. (2011)
      The present paper investigates the mechanical behaviour of buried steel pipelines, crossing active strike-slip tectonic faults. The fault plane is vertical and perpendicular to the pipeline axis. The interacting soil-pipeline ...

    • Mechanical Behavior of Steel Pipe Bends: An Overview 

      Karamanos S.A. (2016)
      An overview of the mechanical behavior of steel pipe (elbows) is offered, based on previously reported analytical solutions, numerical results, and experimental data. The behavior of pipe bends is characterized by significant ...

    • Mechanical Response of Steel Pipe Welded Lap Joints in Seismic Areas 

      Karamanos S.A., Koritsa E., Keil B.D., Card R.J., Pappa P. (2017)
      Nonlinear finite element simulation tools are employed to investigate the bending capacity of internally-pressurized double-welded lap pipeline joints for a typical steel, with D | t value equal to 191.5. The study constitutes ...

    • Mechanics models for hydrogen embrittlement mechanisms 

      Liang, Y.; Sofronis, P.; Dodds Jr, R. H.; Aravas, N. (2005)
      Of the many suggestions of hydrogen-induced degradation of engineering materials, two mechanisms appear to be viable in non-hydride forming systems: hydrogen-enhanced localized plasticity (HELP) and hydrogeninduced decohesion. ...

    • A Novel System for Assuring the Performance of Steel Water Pipelines in Ground Settlement Areas 

      Vazouras P., Keil B.D., Dakoulas P., Mielke R.D., Karamanos S.A. (2022)
      The paper presents the application of a new system, called "InfraShield," which increases the performance level of steel water pipelines, which are connected to rigid structures and subjected to differential ground settlement. ...

    • Numerical simulation of buried steel pipelines under strike-slip fault displacements 

      Vazouras, P.; Karamanos, S. A.; Dakoulas, P. (2011)
      The paper examines the structural response of buried butt-welded steel pipelines, crossing active strike-slip tectonic faults, which are vertical and perpendicular to the pipeline axis. The interacting soil-pipeline system ...

    • Numerical Simulation of Steel Lap Welded Pipe Joint Behavior in Seismic Conditions 

      Chatzopoulou G., Fappas D., Karamanos S.A., Keil B.D., Mielke R.D. (2018)
      The present paper reports numerical calculations which complement experimental work reported in the companion paper entitled "Experimental Results of Steel Lap Welded Joints in Seismic Conditions", also presented in ASCE ...

    • On the inverse-Gaussian shadowing 

      Chatzidiamantis, N. D.; Sandalidis, H. G.; Karagiannidis, G. K.; Kotsopoulos, S. A. (2011)
      The Inverse Gaussian (IG) distribution has been recently proposed as a less complex alternative to the classical log-normal distribution to describe shadowing phenomena. This paper investigates the performance of digital ...

    • Optimal accelerated SOR-like (ASOR) method for singular symmetric saddle point problems 

      Guo X.-P., Hadjidimos A. (2020)
      In a recent paper a new iterative method for the solution of the nonsingular symmetric saddle point problem was proposed (Njeru and Guo, 2016). The ASOR method belongs to the family of the SOR-like methods and uses two ...

    • Polyatomic thermal creep flows through long microchannels at large temperature ratios 

      Tantos C. (2019)
      Rarefied polyatomic gas flows through long microchannels of circular cross section due to small temperature and pressure gradients have been studied on the basis of the Rykov model in a wide range of the gas rarefaction ...

    • Simplified methodology for estimating seismic coefficients for the pseudo-static slope stability analysis of earth dams 

      Papadimitriou, A. G.; Andrianopoulos, K. I.; Bouckovalas, G. D.; Anastasopoulos, K. (2011)
      This paper presents a simplified methodology for the estimation of seismic coefficients for pseudo-static slope stability analysis of earth dams and tall embankments. This methodology is based on a statistical analysis of ...

    • Soil-pipe interaction models for simulating the mechanical response of buried steel pipelines crossing active faults 

      Sarvanis G.C., Ferino J., Karamanos S.A., Vazouras P., Dakoulas P., Mecozzi E., Demofonti G. (2016)
      In geohazard areas, buried pipelines are subjected to permanent ground deformations, which constitute major threats for buried pipelines. Geohazards include seismic fault movements, liquefactioninduced lateral spreading ...

    • Structural integrity of buckled steel pipes 

      Pournara A.E., Karamanos S.A., Papatheocharis T., Perdikaris P.C. (2015)
      Local distortions on steel pipeline wall in the form of buckles may constitute a threat for the structural integrity of the steel pipeline. In the present paper, experimental research supported by numerical simulation is ...

    • Structural integrity of steel hydrocarbon pipelines with local wall distortions 

      Pournara, A. E.; Karamanos, S. A.; Papatheocharis, T.; Perdikaris, P. C. (2014)
      Local distortions on pipeline wall in the form of dents or buckles may constitute a threat for the structural integrity of the steel pipeline. In the present paper, experimental research supported by numerical simulation ...