Results 61 to 70 of about 58,230 (252)

Toward Direct Detection of Hot Jupiters with Precision Closure Phase: Calibration Studies and First Results from the CHARA Array

, 2011
Direct detection of thermal emission from nearby hot Jupiters has greatly advanced our knowledge of extrasolar planets in recent years. Since hot Jupiter systems can be regarded as analogs of high contrast binaries, ground-based infrared long baseline ...
A. Mérand, Barnes T. G., Blackwell D. E., C. Farrington, E. Pedretti, Efron B., G. Schaefer, H. McAlister, Hestroffer D., J. D. Monnier, J. Sturmann, L. Sturmann, Leggett S. K., M. Zhao, N. Thureau, N. Turner, P. J. Goldfinger, Press W. H., S. T. Ridgway, T. ten Brummelaar, van Leeuwen F., X. Che   +21 more
core   +2 more sources

Transmission Water Losses at South African Irrigation Schemes: A Case Study of the Vaalharts Irrigation Scheme

Irrigation and Drainage, EarlyView.
ABSTRACT Irrigation water supply is under scrutiny because of dwindling water resources. Most irrigation water in South Africa (SA) is transmitted by canals. Transmission water loss (TWL) accounts for 12% of the irrigation water losses in SA. Therefore, there is a need to investigate and understand the major parameters influencing TWL at Vaalharts ...
M. Mutema, M. C. Sekgala, S. Vorster, D. C. Sambo, S. Mahlamvu, K. Dhavu   +5 more
wiley   +1 more source

Things to do with a broken stick [PDF]

arXiv, 2010
We use the idea of the broken stick problem (which goes back to Poincare) and calculate the corresponding probabilities for the cases in which the three broken part are: the medians in a triangle, the altitudes, radii of excircles, angle bisectors, distances from I or O to the vertices, respectively sides, and some other three elements in a triangle ...
arxiv  

The lowermost last‐glacial equilibrium line altitude in the Taiwanese Central Mountain Range and its implications for the palaeoclimate and the tropospheric moisture transport in East Asia

Journal of Quaternary Science, EarlyView.
Abstract The high mountains of Taiwan provide a unique location for Quaternary palaeoclimate research in East Asia and the north‐western Pacific. This study applies geomorphological field mapping and rock surface exposure dating with paired (10Be/26Al) in situ‐produced terrestrial cosmogenic nuclides to identify and date glacial landforms and boulders ...
Robert Hebenstreit, Jacob Hardt, Margot Böse   +2 more
wiley   +1 more source

Stokes tomography of radio pulsar magnetospheres. I. Linear polarization

, 2010
Polarimetric studies of pulsar radio emission traditionally concentrate on how the Stokes vector (I, Q, U, V) varies with pulse longitude, with special emphasis on the position angle (PA) swing of the linearly polarized component.
A. Melatos, Blaskiewicz, Brentjens, Burn, C. T. Y. Chung, Cheng, Cheng, Cordes, Deutsch, Dyks, Dyks, Gangadhara, Gil, Gil, Gould, Graham-Smith, Han, Haverkorn, Hibschman, Johnston, Johnston, Karastergiou, Karastergiou, Kaspi, Knight, Kramer, Lorimer, Lyne, Lyne, Manchester, Manchester, McKinnon, Melatos, Melrose, Navarro, Ord, Radhakrishnan, Rankin, Rankin, Rankin, Ruderman, Smith, Stairs, Słowikowska, von Hoensbroech, Watters, Weltevrede, Xilouris, Xu   +48 more
core   +1 more source

Cropping History and Cropland Abandonment Period Influenced Levels of Soil Organic Carbon, Distribution of Aggregates and Aggregate Associated Carbon

Land Degradation &Development, EarlyView.
ABSTRACT Knowledge gaps remain regarding soil organic carbon (SOC) storage and aggregate dynamics under varying cropland abandonment periods, particularly within the context of degraded and low‐SOC soils. This study aimed to assess the influence of cropping history and the period of cropland abandonment period on SOC, aggregate distribution, and ...
Sinesihle Mcengwa, Siphamandla Nyambo, Vusi Erick Mbanjwa, Dimpho Elvis Elephant   +3 more
wiley   +1 more source

Wind Estimation Using Quadcopter Motion: A Machine Learning Approach [PDF]

arXiv, 2019
In this article, we study the well known problem of wind estimation in atmospheric turbulence using small unmanned aerial systems (sUAS). We present a machine learning approach to wind velocity estimation based on quadcopter state measurements without a wind sensor.
arxiv  

An algorithm for two-dimensional mesh generation based on the pinwheel tiling

, 2004
We propose a new two-dimensional meshing algorithm called PINW able to generate meshes that accurately approximate the distance between any two domain points by paths composed only of cell edges.
Ganguly, Pritam, Papoulia, Katerina D., Vavasis, Stephen A.   +2 more
core   +1 more source

Pre‐existing phytoplankton biomass concentrations shape coastal plankton response to fire‐generated ash leachate

Limnology and Oceanography, EarlyView.
Abstract Climate‐driven warming is projected to intensify wildfires, increasing their frequency and severity globally. Wildfires are an increasingly significant source of atmospheric deposition, delivering nutrients, organic matter, and trace metals to coastal and open ocean waters.
Nicholas Baetge, Kimberly H. Halsey, Erin J. Hanan, Michael J. Behrenfeld, Allen J. Milligan, Jason R. Graff, Parker Hansen, Craig A. Carlson, Rene M. Boiteau, Eleanor C. Arrington, Jacqueline Comstock, Elisa R. Halewood, Elizabeth L. Harvey, Norman B. Nelson, Keri Opalk, Brian Ver Wey   +15 more
wiley   +1 more source

Projective geometry from Poisson algebras [PDF]

arXiv, 2009
In analogy with the Poisson algebra of the quadratic forms on the symplectic plane, and the notion of duality in the projective plane introduced by Arnold in \cite{Arn}, where the concurrence of the triangle altitudes is deduced from the Jacobi identity, we consider the Poisson algebras of the first degree harmonics on the sphere, the pseudo-sphere and
arxiv