Results 81 to 90 of about 14,664 (299)

Hazardous near Earth asteroid mitigation campaign planning based on uncertain information on fundamental asteroid characteristics [PDF]

, 2014
Given a limited warning time, an asteroid impact mitigation campaign would hinge on uncertainty-based information consisting of remote observational data of the identified Earth-threatening object, general knowledge of near-Earth asteroids (NEAs), and ...
Abe, Baer, Bottke, Britt, Britt, Consolmagno S.J., Deb, Flynn, Foster, G. Radice, Gritzner, Hasegawa, Holsapple, J.P. Sanchez, M. Ceriotti, Maddock, Mason, Michel, Milani, Morrison, Müller, Opeil, Sanchez, Sanchez, Sugimoto, Vasile, Wertz, Wood, Y. Sugimoto, Yager, Yoshikawa, Yurimoto, Zuiani, Öpik   +33 more
core   +1 more source

Orbital Electrowetting: From Continuous Droplet Transport to Programmable Microfluidics

Advanced Materials, EarlyView.
This work comprehensively summarizes the mechanisms, recent advances, potential applications, and key challenges of orbital electrowetting. It highlights that integrating orbital electrowetting with conventional electrowetting is required to enable complete digital‐microfluidic workflows while simplifying platform architecture.
Jie Tan, Jiayu Du, Dong Lv, Yikui Gao, Dongyue Jiang, Zuankai Wang, Wenjie Liu, Chi Yan Tso   +7 more
wiley   +1 more source

Design and Analysis of a Micro–Electro-Mechanical System Thruster for Small Satellites and Low-Thrust Propulsion

Aerospace
As a cost-effective and versatile solution, small satellites are increasingly being considered for space exploration. However, one of the major challenges in deploying small satellites for high total impulse missions, particularly deep space exploration,
Yubin Zhong, Fabrizio Ponti, Francesco Barato, Guojun Xia, Siyu Li, Xiao Zhang, Tao Wu   +6 more
doaj   +1 more source

An evaluation of metallized propellants based on vehicle performance [PDF]

An analytical study was conducted to determine the improvements in vehicle performance possible by burning metals with conventional liquid bipropellants.
Green, James M., Zurawski, Robert L.
core   +1 more source

Preparation and Performance Evaluation of Platinum Barium Hexaaluminate Catalyst for Green Propellant Hydroxylamine Nitrate Thrusters. [PDF]

Materials (Basel), 2021
Kang S, Kwon S.
europepmc   +1 more source

Magnetically Actuated Drops‐on‐Stilts Microrobots for Transport and Delivery of Hydrophobic Cargo

Advanced Materials Interfaces, EarlyView.
Iron oxide nanoparticles and oil droplets in external magnetic fields form “drops‐on‐stilts” microrobots that transport hydrophobic cargo. Tunable nanoparticle–droplet interactions generate stilt‐like structures. Field rotation enables walking, obstacle navigation, and collective motion.
Oluwafemi Ligan, Hrishabh Singh, Sahil Kulkarni, Hong Huy Tran, James M. Kikkawa, Daeyeon Lee, Ravi Radhakrishnan, Edward Steager, Hyun Koo, Kathleen Stebe   +9 more
wiley   +1 more source

Dynamics of electrically controlled propellant valves for “green”-propellant thrusters

Technical mechanics
Recently, the leading space countries have paid much attention to searching for and using new types of untoxic “green” propellants. Developments of 0.1 N to 220 N “green”-propellant thrusters have been reported, and some of them have been successfully tested in flight conditions.
openaire   +1 more source

Topological Point Defects in SmC* Liquid Crystals Under Mechanical Disturbance

Advanced Materials Interfaces, EarlyView.
Tangetial air jet shear inducess island formation and nucleates topological point defects in uniform SmC films. Island bounded by edge dislocation loops shrink and transform into isolated point defects under continued shear. Mechanical perturbatio provides a controllable route for defect engineering in smectric liquid crystal thin films.
Gunganist Kongklad, Vandana Molahalli, Apichart Pattanaporkratana, Nattaporn Chattham   +3 more
wiley   +1 more source

Flow visualization of a rocket injector spray using gelled propellant simulants [PDF]

A study was conducted at NASA-Lewis to compare the atomization characteristics of gelled and nongelled propellant simulants. A gelled propellant simulant composed of water, sodium hydroxide, and an acrylic acid polymer resin (as the gelling agent) was ...
Green, James M., Rapp, Douglas C., Roncace, James   +2 more
core   +1 more source

Hot-Fire Testing of 100 LB(sub F) LOX/LCH4 Reaction Control Engine at Altitude Conditions [PDF]

, 2010
Liquid oxygen/liquid methane (LO2/LCH4 ) has recently been viewed as a potential green propulsion system for both the Altair ascent main engine (AME) and reaction control system (RCS).
Kleinhenz, Julie E., Marshall, William M.   +1 more
core   +1 more source