Results 21 to 30 of about 228,330 (246)

Semi-analytical guidance algorithm for autonomous close approach to non-cooperative low-gravity targets [PDF]

, 2014
An adaptive guidance algorithm for close approach to and precision landing on uncooperative low-gravity objects (e.g. asteroids) is proposed. The trajectory, updated by means of a minimum fuel optimal control problem solving, is expressed in a polynomial
Armellin, Roberto, Lunghi, Paolo, Michele, Lavagna   +2 more
core  

3D Anodic Alumina Nanoarchitectures: A Decade of Progress from Foundational Science to Functional Metamaterials

Advanced Materials, EarlyView.
Ordered three‐dimensional anodic aluminum oxide (3D‐AAO) nanoarchitectures with longitudinal and transverse pores enable architecture‐driven metamaterials. The review maps fabrication advances, including hybrid pulse anodization, and shows how 3D‐AAO templates tailor properties across magnetism, energy, catalysis, and sensing.
Marisol Martín‐González
wiley   +1 more source

Theoretical analysis of Reiner-Philippoff fluid flow in two layers due to metachronal propulsion: Subject to surrounding temperature

Case Studies in Thermal Engineering
Mucociliary clearance plays a crucial role within the respiratory system as an initial protective mechanism against infections. Hence, it is imperative to validate any assumptions made regarding the mucociliary clearance and its impact on its ...
Muhammad Bilal Arain, Adnan Idris, Sidra Shaheen, Taseer Muhammad, Junhui Hu   +4 more
doaj   +1 more source

Aircraft control system [PDF]

, 1973
An aircraft control system is described which is particularly suited to rotary wing aircraft. Longitudinal acceleration and course rate commands are derived from a manual control stick to control translational velocity of the aircraft along a flight path.
Koziol, J. S., Jr., Rempfer, P. S., Robertson, A. J., Stevenson, L. E.   +3 more
core   +1 more source

Photocatalytic Water Splitting on the Lunar Surface: Prospects for In Situ Resource Utilization

Advanced Materials Interfaces, EarlyView.
Water has been found in craters on the moon nearby locations which are illuminated >80% of the time. Photocatalysis uses energy from sunlight to drive chemical reactions such as water splitting to produce oxygen and hydrogen. It is a scalable technology that requires lighter equipment and utilizes resources available on the moon. ABSTRACT The discovery
Ranjani Kalyan, Thomas D. Small, Gregory F. Metha, Mahmoud Adel Hamza, Thomas J. O'Dea, Yideng Shen, Cameron J. Shearer   +6 more
wiley   +1 more source

Unraveling metachronal wave effects on heat and mass transfer in Non-Newtonian fluid

Case Studies in Thermal Engineering
Non-Newtonian fluids flow generated by “cilia” are critical in medicine and bio-medical engineering. Such investigations are created by the back-and-forth movement of a microscopic hair-like structure connected to the walls, which causes a metachronal ...
Yuchi Leng, Yijie Li, Haris Anwaar, Sidra Shaheen, Muhammad Bilal Arain, Emad Az-Zo'bi, Ahmed M. Zidan   +6 more
doaj   +1 more source

From the Discovery of the Giant Magnetocaloric Effect to the Development of High‐Power‐Density Systems

Advanced Materials Technologies, EarlyView.
The article overviews past and current efforts on caloric materials and systems, highlighting the contributions of Ames National Laboratory to the field. Solid‐state caloric heat pumping is an innovative method that can be implemented in a wide range of cooling and heating applications.
Agata Czernuszewicz, Yaroslav Mudryk, Jun Cui, Lucas Griffith, Duane D. Johnson, Julie Slaughter   +5 more
wiley   +1 more source

Roll‐to‐Roll Manufacturing of Flexible Thermoelectric Semiconductors Using Low‐Level Direct‐Current Sputtering

Advanced Materials Technologies, EarlyView.
Roll‐to‐roll direct‐current sputtering enables room‐temperature manufacture of flexible bismuth telluride thermoelectric films. By identifying a low‐power deposition window that suppresses charge‐induced arcing, this work links sputtering conditions to film structure, charge transport, and thermoelectric performance, achieving a room‐temperature figure
Xudong Tao, John O'Sullivan, Kening Wan, Emiliano Bilotti, Ruy Sebastian Bonilla, Hazel E. Assender   +5 more
wiley   +1 more source

Channel flow of Ellis fluid due to cilia motion

Nonlinear Engineering
In this report, a theoretical study is directed at the cilia motion of the Ellis fluid model due to the propagation of an infinite metachronal wave train traveling along the walls of the channel due to the continuous beating of the cilia.
Arain Muhammad Bilal, Shaheen Sidra, Nisar Kottakkaran Sooppy, Hu Junhui, Muhammad Taseer   +4 more
doaj   +1 more source

Determination of the Exchange Current Density at Lithium │ Polymer Electrolyte Interfaces

Advanced Science, EarlyView.
This work presents a comprehensively validated method to determine the exchange current density (j0) at the interface of lithium metal and polymer electrolytes by combining electrochemical impedance spectroscopy with Bayesian inference and distribution of relaxation times analyses to successfully deconvolute solid electrolyte interphase and charge ...
Katrin Geng, Bryce A. Tappan, Stefano Passerini, Yang Shao‐Horn, Dominic Bresser   +4 more
wiley   +1 more source