Results 41 to 50 of about 1,004 (162)

The role of fibroblast growth factors in cell and cancer metabolism. [PDF]

FEBS Lett
Fibroblast growth factor (FGF) signaling regulates crucial signaling cascades that promote cell proliferation, survival, and metabolism. Therefore, FGFs and their receptors are often dysregulated in human diseases, including cancer, to sustain proliferation and rewire metabolism.
Price J, Francavilla C.
europepmc   +2 more sources

A study on predicting network corrections in PPP-RTK processing [PDF]

Advances in Space Research, 2017
Abstract In PPP-RTK processing, the network corrections including the satellite clocks, the satellite phase biases and the ionospheric delays are provided to the users to enable fast single-receiver integer ambiguity resolution. To solve the rank deficiencies in the undifferenced observation equations, the estimable parameters are formed to generate ...
Wang, Kan, Khodabandeh, Amir, Teunissen, Peter   +2 more
openaire   +2 more sources

Application of Atmospheric Augmentation for PPP-RTK with Instantaneous Ambiguity Resolution in Kinematic Vehicle Positioning

Remote Sensing
The long convergence time and non-robust positioning accuracy are the main factors limiting the application of precision single-point positioning (PPP) in kinematic vehicle navigation. Therefore, a dual/triple-frequency multi-constellation PPP-RTK method
Zhu-Feng Shao, Dun-Wei Gong, Zi-Yang Qu, Sheng-Yi Xu, Xiao-Ting Lei, Zhen Li   +5 more
doaj   +1 more source

Mapping Space Weather Induced PPP‐AR Uncertainty to UAV Power‐Line Inspection Safety Risk

Space Weather, Volume 24, Issue 10, October 2026.
Abstract Space weather can affect the reliability of satellite‐based positioning and thereby disrupt industrial operations that increasingly depend on Global Navigation Satellite System (GNSS) services. This concern is becoming more relevant with the rapid growth of the low‐altitude economy, where unmanned aerial vehicles (UAVs) are increasingly used ...
Mengfei Sun, Ning Li, Tong Liu
wiley   +1 more source

Quantifying Groundwater–Surface Water Exchange on a River Island: A Comparative Analysis of Direct and Indirect Methods

Water Resources Research, Volume 62, Issue 10, October 2026.
Abstract Groundwater–surface water exchange is a key hydrological process that governs river water quality and aquatic ecosystems. However, the quantification of such exchange remains uncertain, especially within river island aquifers where exchange processes are highly heterogeneous.
Nayeon Ki, Kyungwon Kwak, Jonghoon Park, Gyeongseo Jeong, Yongmoon Lee, Hanjin Choe, Chung‐Mo Lee   +6 more
wiley   +1 more source

Robust Machine Learning–Based Ionospheric Delay Grid Modeling for PPP‐RTK Under Sparse Reference Stations and Severe Geomagnetic Disturbance

Space Weather, Volume 24, Issue 9, September 2026.
Abstract Sparse reference station networks and severe geomagnetic disturbances can significantly degrade the accuracy of regional ionospheric delay modeling at the network side, thereby reducing the positioning performance of PPP‐RTK. To address this issue, this study proposes a machine learning‐based ionospheric delay grid modeling method that finely ...
Linyu He, Weiping Jiang, Hua Chen, Xingyu Zhou, Tianjun Liu, Jie He, Jie Ding   +6 more
wiley   +1 more source

Tightly coupled multi-frequency PPP-RTK/INS integration model and its application in an urban environment

Geo-spatial Information Science
The Precise Point Positioning-Real Time Kinematic (PPP-RTK) technique, which provides centimeter-level positioning with instantaneous ambiguity resolution, is considered as a potential tool for intelligent vehicle applications.
Hang Zhu, Yibin Yao, Xiongwei Ma, Qi Zhang   +3 more
doaj   +1 more source

A Multi-Epoch Processing Strategy for PPP-RTK Users

, 2023
AbstractThe present contribution aims to address why the stochastic model of the PPP-RTK user-filter is misspecified, and how one can limit the precision-loss associated with user parameter solutions. By developing tools for measuring the stated precision-loss under existing formulations of the user’s Kalman filter, we propose an alternative ...
Khodabandeh, A, Teunissen, PJG, Psychas, D   +2 more
openaire   +2 more sources

Integrity Monitoring of PPP-RTK Positioning; Part II: LEO Augmentation

Remote Sensing, 2022
Low Earth orbit (LEO) satellites benefit future ground-based positioning with their high number, strong signal strength and high speed. The rapid geometry change with the LEO augmentation offers acceleration of the convergence of the precision point positioning (PPP) solution.
Kan Wang 0005, Ahmed el-Mowafy, Wei Wang, Long Yang, Xuhai Yang   +4 more
openaire   +4 more sources

A primer on forest structure measurement with lidar for ecologists

Ecosphere, Volume 17, Issue 8, August 2026.
Abstract Light detection and ranging (lidar) technology has fundamentally advanced the way we measure forest structure, facilitating new insights into ecological processes. Lidar for forest ecology applications is deployed on multiple types of platforms that operate from the ground, air, or space, and each has associated strengths and limitations ...
K. C. Cushman, Kamil Král, Angelica M. Almeyda Zambrano, Eben N. Broadbent, Martin Krůček, Alice Rosen, Sean M. McMahon   +6 more
wiley   +1 more source