32 research outputs found
Topology of Disordered Networks and their Applications
No full textThis eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contac
Topology of Disordered Networks and their Applications
No full textThis eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contac
Solar Sail Trajectory Design for a Martian Moon Sample-return Mission
No full textWith a dedicated mission to the Martian moons, Phobos and Deimos, set to launch soon, there is a growing interest in further exploring these moons using low-thrust propulsion. This paper investigates the trajectory design for a sample-return mission from Deimos using fuel-free solar sail propulsion technology, aiming to maximize operational time near Deimos within a minimum permissible total mission duration. Time-optimal transfers between Earth and Deimos are sought by formulating and solving an optimal control problem using a direct pseudospectral method. Initial guesses for the direct method are generated by considering a patched circular restricted three-body problem (CR3BP) approximation and by searching for heteroclinic-like connections between the Sun-Earth and Mars-Deimos systems using the differential evolution algorithm. The obtained solution, with a maximum mission duration set to eight years based on the insights from initial guess generation, results in an optimal duration of stay at Deimos of 329 days with a mission duration of 7.7 years. Although the patched CR3BP approximation demonstrated valid transfer solutions for this study, it is deemed computationally inefficient for future trajectory designs for similar mission concepts targeting either only Phobos or both moons at once. Nevertheless, the trajectories obtained back and forth from Deimos are sufficiently optimal for a preliminary mission concept and validate the feasibility of achieving such a mission employing a solar sail.Aerospace Engineerin
Oblique propagation of E.M. wave in magnetized quantum plasma with two different spin states
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Thermal dosimetry analysis combined with patient-specific thermal modeling of clinical interstitial ultrasound hyperthermia integrated within HDR brachytherapy for treatment of locally advanced prostate cancer
No full textInvestigation of interstitial ultrasound ablation of spinal and paraspinal tumors: A patient-specific and parametric simulation study
No full textAn explicit expression for velocity profile in presence of secondary current and sediment in an open channel turbulent flow
No full textThe present study revisits the determination of vertical distribution of streamwise velocity in an open channel turbulent flow considering the effect of secondary current in the presence of sediment together with a concentration dependent settling velocity and von Karman constant κs. The work mainly modifies a previous study that introduced a lot of assumptions to obtain an analytical solution of the velocity distribution. The present study overcomes those assumptions in the model and though not fully analytical, attempts to present a semi-analytical solution that is explicit and in the form of a convergent series. Homotopy analysis method is used for this purpose and it is validated with numerical solution as well as with available laboratory data from the literature. How the secondary current and concentration dependent κs influence the velocity profile, is also discussed.The presentation of the authors' names and (or) special characters in the title of the pdf file of the accepted manuscript may differ slightly from what is displayed on the item page. The information in the pdf file of the accepted manuscript reflects the original submission by the author
