نتایج جستجو برای: ceres
تعداد نتایج: 1179 فیلتر نتایج به سال:
The Clouds and the Earth’s Radiant Energy System (CERES) project provides observations of Earth’s radiation budget using measurements from CERES instruments onboard the Terra, Aqua and Suomi National Polar-orbiting Partnership (S-NPP) satellites. As the objective is to create a long-term climate data record, it is necessary to periodically reprocess the data in order to incorporate the latest c...
Building on the experience of NAFTA, and assuming that rules of origin (RoO) negotiated under NAFTA are likely to resemble those that would be agreed upon in an FTAA, this paper discusses how different RoO criteria would affect different Southern partners in a multi-stage production setting. Next, we use a combination of parametric and non-parametric methods to estimate the costs of RoO under N...
یکی از اهداف علم کشاورزی دقیق، ایجاد ابزار های با دقت و توانمندی های بیشتر برای بررسی فرآیند های آب خاک، گیاه و اتمسفر و در نهایت، یافت و معرفی بهترین استراتژی های مدیریت مزرعه ای است. هدف از این مطالعه توسعه مدلی بر پایه مدل ceres-maize است که با توجه به شرایط خاص کشورمان توانمندی های بیشتری برای شبیه سازی رشد ذرت در شرایط تنش شوری و خشکی داشته باشد. گیاهی است گه بتواند در در این مطالعه با هدف...
The dwarf planet Ceres may have an ice-rich crust, and subsurface ice exposed by impacts or endogenic activity would be subject to sublimation. We model surface and subsurface temperatures on Ceres to assess lifetimes of water ice and other volatiles. Topographic shadowing allows a small but nonnegligible fraction (∼0.4%) of Ceres’ surface to be perennially below the ∼110 K criterion for 1 Gyr ...
[1] Spectral albedo and bidirectional reflectance of snow were measured at Dome C on the East Antarctic Plateau for wavelengths of 350–2400 nm and solar zenith angles of 52°–87°. A parameterization of bidirectional reflectance, based on those measurements, is used as the lower boundary condition in the atmospheric radiation model SBDART to calculate radiance and flux at the top of the atmospher...
CERES is a dilepton experiment at the CERN SPS, known for its observation of enhanced production of low mass ee pairs in collisions between heavy nuclei [ 1]. The fact that the excess pairs had invariant masses above approximately twice the pion mass and that the enhancement was absent in proton induced collisions [ 2] pointed towards pion annihilation ππ → ρ → ee as the additional source of le...
Aims. We present a study of the spectrophotometric properties of dwarf planet Ceres in the visual-to-infrared (VIS-IR) spectral range by means of hyper-spectral images acquired by the VIR imaging spectrometer on board the NASA Dawn mission. Methods. Disk-resolved observations with a phase angle within the 7◦ < α < 132◦ interval were used to characterize Ceres’ phase curve in the 0.465–4.05 μm s...
Context. Astronomical research dealing with accurate radial velocity measurements need reliable astronomical standards to calibrate the spectrographs and to assess possible systematics. Stellar radial velocity standards offer a reference at the level of a few hundred m s−1 and are not adequate for most present needs. Aims. We aim to show that sunlight reflected by asteroids is a fairly accessib...
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