Results 41 to 50 of about 3,435,507 (205)

Distinct impacts of diverse forcing agents on Arctic sea ice since the mid-twentieth century

open access: yesnpj Climate and Atmospheric Science
Arctic sea ice has undergone non-monotonic changes since the middle of the last century. Here, we investigate the cause of this behavior by isolating and quantifying the effects of anthropogenic aerosols, well-mixed greenhouse gases, and biomass burning ...
Yu-Chi Lee   +3 more
doaj   +1 more source

From Tides to Currents: Unraveling the Mechanism that Powers WASP-107b’s Internal Heat Flux

open access: yesThe Astrophysical Journal
The sub-Jovian exoplanet WASP-107b ranks among the best-characterized low-density worlds, featuring a Jupiter-like radius and a mass that lies firmly in the sub-Saturn range.
Konstantin Batygin
doaj   +1 more source

Simulation of Contact Force of Fault Planetary Gear System based on Virtual Prototype Technology

open access: yesJixie chuandong, 2015
In order to obtain the changing pattern of contact force of fault planetary gear system,a dynamics model of fault planetary gear system is established and the computation method for contact force of gear meshing based on Hertz theory is also introduced ...
Xiang Ling, Chen Tao, Hu Silei
doaj  

Cr-spinel records metasomatism not petrogenesis of mantle rocks

open access: yesNature Communications, 2019
Chromian-spinel from mafic-ultramafic rocks is used as a reliable geotectonic and mantle melting indicator. Here, the authors argue that this only works partially – it can be used to assess information on mantle metasomatic processes but not petrogenesis.
Hamed Gamal El Dien   +8 more
doaj   +1 more source

The topology of non-linear global carbon dynamics: from tipping points to planetary boundaries

open access: yesEnvironmental Research Letters, 2013
We present a minimal model of land use and carbon cycle dynamics and use it to explore the relationship between non-linear dynamics and planetary boundaries.
J M Anderies   +3 more
doaj   +1 more source

In situ, Surface-deployed Distributed Instruments for Planetary Science: Scientific Opportunities and Technology Feasibility

open access: yesThe Planetary Science Journal
In this paper, we assess the scientific promise and technology feasibility of in situ distributed instruments for planetary surface and atmospheric science. A distributed instrument is an instrument designed to collect spatially and temporally correlated
Federico Rossi   +8 more
doaj   +1 more source

Study on Nonlinear Dynamics Characteristic of Two-stage Planetary Gear Train

open access: yesJixie chuandong, 2020
The translation and torsion coupled strong nonlinear dynamics model of two-stage planetary gear transmission system is established, and the nonlinear factors such as time-varying meshing stiffness, tooth side clearance and meshing error are introduced ...
Xiaolu Leng   +3 more
doaj  

Solar barycentric dynamics from a new solar-planetary ephemeris

open access: yesAstronomy & Astrophysics, 2018
Aims. The barycentric dynamics of the Sun has increasingly been attracting the attention of researchers from several fields, due to the idea that interactions between the Sun’s orbital motion and solar internal functioning could be possible.
R. Cionco, D. Pavlov
semanticscholar   +1 more source

Climate effects of a future net forestation scenario in CMIP6 models

open access: yesnpj Climate and Atmospheric Science
Forestation may reduce temperatures by lowering atmospheric CO2. However, biogeophysical changes from forestation may weaken this cooling. We use twelve Coupled Model Intercomparison Project (CMIP6) models to quantify the biogeochemical (carbon cycle ...
James L. Gomez   +8 more
doaj   +1 more source

Research of Load Sharing Performance of Hub Reducer with Considering the Flexible of Planetary Pin

open access: yesJixie chuandong, 2020
Taking the distributed electric drive hub reducer as study object,by using the FEA method, the support stiffness of the planetary wheel bearing and the flexible pin is solved.
Li Xuan
doaj  

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