Results 41 to 50 of about 34,814 (161)

The Mathematical History Behind the Granger–Johansen Representation Theorem

Oxford Bulletin of Economics and Statistics, EarlyView.
ABSTRACT When can a vector time series that is integrated once (i.e., becomes stationary after taking first differences) be described in error correction form? The answer to this is provided by the Granger–Johansen representation theorem. From a mathematical point of view, the theorem can be viewed as essentially a statement concerning the geometry of ...
Johannes M. Schumacher
wiley   +1 more source

Time-control system for communication between data-collection and orbiting [PDF]

, 1974
Platform design includes timers which limit data transmission to times when satellites are within radio communication range. As result of reduced power requirement, data-collection platforms now can be equipped with significantly lighter battery ...
Kurvin, C. W.
core   +1 more source

Physiological cerebrospinal fluid interactions between brain and eye structures are altered after long‐duration spaceflight

Experimental Physiology, EarlyView.
Abstract Long‐duration spaceflight represents an extreme challenge, triggering adaptive responses including spaceflight‐associated neuro‐ocular syndrome, characterized by diminished visual acuity and ocular changes, which is a significant health risk for Mars missions.
Ge Tang, Steven Jillings, Ben Jeurissen, Elena Tomilovskaya, Inna Nosikova, Alexandra Ryabova, Ekaterina Pechenkova, Viktor Petrovichev, Ilya Rukavishnikov, Stefan Sunaert, Paul M. Parizel, Lyudmila Makovskaya, Valentin Sinitsyn, Jan Sijbers, Jitka Annen, Steven Laureys, Angelique Van Ombergen, Seyed‐Ahmad Ahmadi, Floris L. Wuyts, Peter zu Eulenburg   +19 more
wiley   +1 more source

The United States Magnetotelluric Array and the National Impedance Map

Reviews of Geophysics, Volume 64, Issue 2, June 2026.
Abstract The United States Magnetotelluric Array (USMTArray) data set, collected in the years 2006–2024, consists of more than 1,700 long‐period magnetotelluric stations covering the entirety of the contiguous United States on a quasi‐regular 70 km grid.
Anna Kelbert, Paul A. Bedrosian, Adam Schultz, Gary D. Egbert, Louise Pellerin, Jeffrey J. Love, Andrew Frassetto, Benjamin S. Murphy   +7 more
wiley   +1 more source

Swept wing ice accretion modeling [PDF]

An effort to develop a three-dimensional modeling method was initiated. This first step towards creation of a complete aircraft icing simulation code builds on previously developed methods for calculating three-dimensional flow fields and particle ...
Bidwell, Colin S., Potapczuk, Mark G.
core   +1 more source

Interferometric locating system [PDF]

, 1980
A system is described for determining the position of a vehicle or other target that emits radio waves and which is of the type that senses the difference in time of arrival at spaced ground stations of signals from the vehicle to locate the vehicle on a
Macdoran, P. F.
core   +1 more source

World Englishes, applied linguistics, and air traffic control communication

World Englishes, Volume 45, Issue 2, Page 292-308, June 2026.
Abstract Air traffic control (ATC) communication in international aviation is conducted in a variety often referred to as Aviation English. Based on an analysis of the Standards and Recommended Practices (SARPs) defined by the International Civil Aviation Organization (ICAO), two specialized sub‐registers of Aviation English are identified in previous ...
Markus Bieswanger
wiley   +1 more source

Measure Less, Map More: Using Machine Learning, Physiography, and Prior Depth Maps to Extrapolate In‐Swath Snow Depth Measurements Across Mountain Basins

Geophysical Research Letters, Volume 53, Issue 10, 28 May 2026.
Abstract Basin‐wide snow depth (SD) maps can support operational water supply assessments, but their availability is limited by measurement costs (airborne) or sampling constraints (satellite and drone). We present Swath‐random forest (RF), a methodology that trains random forests on SD measured within a narrow swath (<10% of a basin) to extrapolate ...
Eric E. Small, Mark S. Raleigh, Jordan N. Herbert   +2 more
wiley   +1 more source

A Topology Optimization Framework for the Inverse Design of Nonlinear Mechanical Metamaterials

Advanced Engineering Materials, Volume 28, Issue 9, 6 May 2026.
This work uses topology optimization to design unit cells for mechanical metamaterials with a prescribed nonlinear stress–strain response. The framework adds contact and postbuckling modeling to synthesize microstructures for three highly nonlinear responses, including pseudoductile behavior, monostable with snap‐through buckling, and bistable ...
Charlie Aveline, Matthew Santer, Robert Hewson   +2 more
wiley   +1 more source

Aerodynamic testing technique for twin fuselage models at hypersonic speeds [PDF]

A testing technique for obtaining the static aerodynamic characteristics of twin-fuselage configurations at hypersonic speeds by using a conventional single-balance installation has been evaluated.
Ashby, G. C., Jr.
core   +1 more source