Results 71 to 80 of about 1,232,903 (298)

Mayan Cities of Yucatan; Settlement Patterns and Structure Types

open access: yesProstor, 2018
The research results on prehistoric Mesoamerican settlements in Mexico are presented through the planners’, rather than the archeological, point of view.
Nenad Lipovac, Nikolina Gradečki
doaj   +1 more source

Symmetry‐Driven Unconventional Magnetoelectric Coupling in Perovskite Altermagnets: From Bulk to the Two‐Dimensional Limit

open access: yesAdvanced Science, EarlyView.
The symmetry‐driven coexistence of altermagnetism and (anti)ferroelectricity in perovskites shows a strong dimensional dependence. Upon reducing the system from bulk to the two‐dimensional limit, only C‐type antiferromagnetic order retains ferroelectrically switchable altermagnetism, whereas A‐ and G‐type orders become conventional antiferromagnets ...
Zhou Cui   +6 more
wiley   +1 more source

Propagating Wave Phenomena Detected in Observations and Simulations of the Lower Solar Atmosphere [PDF]

open access: yes, 2012
We present high-cadence observations and simulations of the solar photosphere, obtained using the Rapid Oscillations in the Solar Atmosphere imaging system and the MuRAM magnetohydrodynamic (MHD) code, respectively. Each data set demonstrates a wealth of
Shelyag, S.   +14 more
core   +1 more source

Wafer‐Scale Atomically‐Thin Gold: Transferable Platform for Flexible Optoelectronics, Thermal Management and Bio‐Interfaces

open access: yesAdvanced Science, EarlyView.
Combining template stripping with a graphene‐inspired transfer yields continuous, transferable gold films at 6‐inch wafer scale with thicknesses approaching the atomic limit. The atomically smooth, near‐bulk‐quality films offer above 86% transmittance and sub‐20 Ω/square sheet resistance, serving as a universal platform for flexible optoelectronics ...
Dmitry Yakubovsky   +24 more
wiley   +1 more source

Astronomical Phenomena of November [PDF]

open access: yes, 1922
英文目次誤記修正済み.

core  

Discovering the unexpected in astronomical survey data

open access: yes, 2017
Most major discoveries in astronomy are unplanned, and result from surveying the Universe in a new way, rather than by testing a hypothesis or conducting an investigation with planned outcomes.
Norris, Ray P. (R17893)
core   +1 more source

Plaid‐Like Spin Splitting and Chirality of Magnon Bands in Antiferromagnetic MnTe2

open access: yesAdvanced Science, EarlyView.
Helicity‐ and angle‐resolved Raman spectroscopy reveals chiral magnons in the non‐coplanar antiferromagnet MnTe 2. Combined with first‐principles calculations and spin‐wave theory, the results establish its altermagnetic character through circular Raman dichroism, reduced rotational symmetry, and a distinctive plaid‐like momentum‐space magnon spin ...
Dirk Wulferding   +10 more
wiley   +1 more source

Receipt for membership of Carr Waller Pritchett to the Royal Astronomical Society, 16 February 1880.

open access: yes, 1880
Receipt for £2.2.0 (two guineas) from the Royal Astronomical Society, dated 16 February 1880 and signed by "W.N. Wesley, Asst Sec"
Royal Astronomical Society
core   +1 more source

A Study of Ancient Indian Astronomy through Architectural Marvels

open access: yesInternational Journal of Emerging Research in Engineering, Science, and Management
Ancient Indian astronomy has a rich legacy that spans millennia, encompassing intricate observations, advanced calculations, and skillful implementations.
Keerthi Krishnanath Prabhu Shirodkar
doaj   +1 more source

Real-World Oriented Smartphone AR Supported Learning System Based on Planetarium Contents for Seasonal Constellation Observation

open access: yesApplied Sciences, 2019
A popular astronomical concept covered by projection learning programs in the planetarium is seasonal constellation. However, a planetarium’s learning environment is limited to virtual scenes, where learners can observe seasonal constellations, but there
Ke Tian   +5 more
doaj   +1 more source

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