Results 1 to 10 of about 40,285 (315)

Post-main-sequence planetary system evolution [PDF]

Royal Society Open Science, 2016
The fates of planetary systems provide unassailable insights into their formation and represent rich cross-disciplinary dynamical laboratories. Mounting observations of post-main-sequence planetary systems necessitate a complementary level of theoretical
Dimitri Veras
doaj   +2 more sources

PARAMETER OPTIMIZATION FOR A THERMAL SIMULATION OF AN URBAN AREA [PDF]

ISPRS Annals of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2023
Urban heat island (UHI) phenomenon is a significant challenge in urban planning, and accurate temperature predictions are crucial for effective decision-making. The choice of material parameters is crucial to simulate a realistic temperature distribution
B. Kottler, S. Fischer, E. Strauss, D. Bulatov, D. Bulatov, P. Helmholz   +5 more
doaj   +1 more source

On Populism, Planets, and Why Concepts Should Precede Definitions and Theory-Seeking

Sociologica, 2019
Despite its remarkable growth in recent years, the study of populism has long suffered from the lack of a comprehensive theory about its causes, development, and outcomes.
Takis S. Pappas
doaj   +1 more source

Fault diagnosis method of shearer planetary gear transmission systemunder variable speed conditions

Gong-kuang zidonghua, 2021
When the shearer cuts the coal seam, the planetary gear transmission system of the traction unit is in a variable speed working condition, and the structure of the planetary gear transmission system is complicated.
MAO Qinghua1,2,, ZHANG Yongqiang1,2, ZHAO Xiaoyong3, ZHANG Xuhui1,2, FAN Hongwei1,2, ZHANG Fei1,2   +5 more
doaj   +1 more source

The record‐breaking heat wave of June 2019 in Central Europe

Atmospheric Science Letters, 2020
After being hit by several devastating heat waves in recent years, Europe experienced an exceptionally hot June in 2019 again. This June is the hottest one on record over Central Europe both in a monthly‐mean sense and in terms of the number of extremely
Peiqiang Xu, Lin Wang, Yuyun Liu, Wen Chen, Ping Huang   +4 more
doaj   +1 more source

Contrast analysis between the trajectory of the planetary system and the periodicity of solar activity [PDF]

Annales Geophysicae, 2017
The relationship between the periodic movement of the planetary system and its influence on solar activity is currently a serious topic in research. The kinematic index of the planet juncture index has been developed to find the track and variation of
W. Sun, W. Sun, W. Sun, J. Wang, J. Wang, J. Chen, J. Chen, Y. Wang, G. Yu, X. Xu   +9 more
doaj   +1 more source

Research on the Coupled Phase-Tuning Vibration Characteristics of a Two-Stage Planetary Transmission System

Machines, 2023
Mesh phasing has a dramatic impact on the static and dynamic behaviours of planetary gear systems. This research investigates the coupled phase-tuning mechanism of two-stage planetary gear systems and the corresponding relationship with the coupled ...
Pengfei Yan, Yaning Li, Qiang Gao, Tao Wang, Chen Zhang   +4 more
doaj   +1 more source

Fatigue Reliability Design Method for Large Aviation Planetary System Considering the Flexibility of the Ring Gear

Applied Sciences, 2022
As the foundation and core of various heavy aircraft transmission systems, the reliability level of large-scale aviation planetary mechanism restricts the economic affordability and service safety for the aircraft to a great extent.
Ming Li, Yuan Luo, Liyang Xie
doaj   +1 more source

Research Progress on the Dynamic Characteristics of Planetary Gear Transmission in a Non-Inertial System

Machines, 2023
Planetary gear systems have many advantages over other gear systems. Previous studies on its dynamic characteristics mostly used Earth as the reference system, which is inconsistent with the actual working conditions of many planetary gear systems, such ...
Bingwei Gao, Yongkang Wang, Guangbin Yu
doaj   +1 more source

E-L₀: Advanced Surface Segmentation of LiDAR Point Clouds in Open-Pit Mine Stepped Terrain

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Ensuring the stability of open-pit mine slopes is crucial for safe and efficient mining operations. To analyze slope stability and assess geological disaster risks, LiDAR point-cloud data are widely used to create high-precision 3-D models.
Tao Chen, Junxiang Tan, Ping Zhou, Gang Hu, Ronghao Yang, Xiubo Wu, Shaoda Li   +6 more
doaj   +1 more source