Results 81 to 90 of about 9,980 (290)

Laboratory Studies of Grains from outside the Solar System: A New Kind of Astronomy [PDF]

Science Progress, 1999
Several phases whose origins predate that of the solar system have been identified in primitive meteorites during the past dozen years. The properties and the observed isotopic structures of these grains provide a variety of information, not obtainable in this detail by other means, on several highly interesting subjects: (a) details of the nuclear ...
openaire   +2 more sources

Polycarbazole–NiOOH Interfacial Engineering of BiVO4 Photoanodes for Efficient and Stable Solar Water Splitting

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
A π‐conjugated carbazole (p‐CBZ) layer is electro‐polymerized on BiVO4 to form a p–n heterojunction that enhances charge separation and suppresses surface recombination, while a NiOOH co‐catalyst accelerates oxygen evolution kinetics. The synergistic BVO/p‐CBZ/NiOOH photoanode delivers a high photocurrent density and long‐term stability for efficient ...
Lakshman Sundar Arumugam, Ana Gutierrez‐Blanco, Agustin O. Alvarez, Alejandro Saura Aviles, Mahesh Eledath‐Changarath, Rafael Abargues, Juan Francisco Sánchez‐Royo, Helena Rabelo, Maria Chiara Spadaro, Jordi Arbiol, Javier E. Durantini, Sixto Giménez   +11 more
wiley   +1 more source

Research Progress of Three‐Terminal Perovskite/Silicon Tandem Solar Cells Based on Back‐Contact Silicon

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
Perovskite/silicon tandem solar cells offer efficiencies beyond 30%, yet conventional architectures face trade‐offs between optical performance and current matching. Three‐terminal tandems employing silicon back‐contact bottom cells eliminate the current‐matching constraint while minimizing optical losses, offering superior energy yield under real ...
Yunhao Fan, Sheng Ma, Huanpei Huang, Zhengping Li, Wenzhong Shen   +4 more
wiley   +1 more source

Optimisation of solar sail interplanetary heteroclinic connections [PDF]

, 2014
This paper investigates time-optimal solar sail trajectories between displaced Libration Point Orbits (LPOs) of different circular restricted three-body systems.
Heiligers, Jeannette, Mingotti, Giorgio, McInnes, Colin   +2 more
core  

Wide binary stars in the Galactic field : a statistical approach [PDF]

, 2010
This thesis focuses on the statistical properties of wide binary (WB) star systems in the Galactic field. With projected separations larger than 200 AU and, consequently, having very low binding energies, WB are sensitive probes of the Galactic ...
Longhitano, Marco
core   +1 more source

Identifying Suitable Front Contacts for High‐Efficiency Cd(Se,Te) Solar Cells on Space‐Qualified Cover Glass

Progress in Photovoltaics: Research and Applications, EarlyView.
Front contact selection governs interfacial stability in CdTe‐based (Cd(Se,Te)) solar cells on ultra‐thin space‐qualified cover glass. Optimized TCO/emitter combinations suppress interdiffusion and deliver up to 16.2% AM0 efficiency with high specific power, demonstrating strong potential for lightweight space photovoltaics.
Aesha P. Patel, Ryan Muzzio, Matthew R. Young, Robert Morrissey, Suresh Chaulagain, B. Edward Sartor, Prabodika N. Kaluarachchi, Christian Velez, Joshua A. Brown, Bishal Shrestha, Joel N. Duenow, Stephen Glynn, Michael J. Heben, Zhaoning Song, Nikolas J. Podraza, Adam B. Phillips, Randy J. Ellingson, Matthew O. Reese   +17 more
wiley   +1 more source

Displaced solar sail orbits : dynamics and applications [PDF]

, 2010
We consider displaced periodic orbits at linear order in the circular restricted Earth-Moon system, where the third massless body is a solar sail. These highly non-Keplerian orbits are achieved using an extremely small sail acceleration.
Simo, J., Simo, Jules, McInnes, Colin, McInnes, Colin R., McInnes, C.R.   +4 more
core  

Heavenly Order: Concept Dynamics, Mathematical Practices, and the Stability of the Solar System [PDF]

, 2018
The proof of the stability of the solar system has been customarily presented as the solution of a great riddle originated by Newton and completed by Laplace. In this paper, I suggest a different narrative. I argue that Newton considered the stability of
Massimiliano Badino, massimiliano.badino@univr.it   +1 more
core   +1 more source

Sliding Mode Control in Aerospace Applications: A Survey

International Journal of Robust and Nonlinear Control, EarlyView.
ABSTRACT Sliding mode control (SMC) enjoys robustness to matched and unmatched (in the case of minimum phase input‐output dynamics) bounded perturbations, and finite time convergence. Second‐order and higher‐order sliding mode control systems (2‐SMC/HOSMC) retain all the advantages of sliding mode control, but in addition can be applied to systems of ...
Yuri Shtessel, Christopher Edwards
wiley   +1 more source

Solar system astrophysics: background science and the inner solar system [PDF]

, 2008
Solar System Astrophysics: A Text for the Science of Planetary Systems covers the field of solar system astrophysics beginning with basic tools of spherical astronomy, coordinate frames, and celestial mechanics.
Wilson, Willam J.F, Milone, Eugene F
core   +1 more source