Results 21 to 30 of about 361 (154)

Microbial biomass activity of a sodic Lixisol reclaimed with gypsum and clean water irrigation in urban vegetable systems of Burkina Faso

Journal of Plant Nutrition and Soil Science, Volume 186, Issue 2, Page 188-195, April 2023., 2023
Abstract Background Little is known about the effects of gypsum application to remediate saline–sodic soils in the tropics and the role of microbial indicators in soil reclamation. Aims Our study aimed at (1) remediating a highly weathered, irrigated sodic Lixisol under prolonged urban crop production by clean water and gypsum application and (2) to ...
Nongma Zongo, Juliane Dao, Désiré Jean‐Pascal Lompo, Kathrin Stenchly, Christoph Steiner, Delphine Manka'abusi, Michel Papaoba Sedogo, Andreas Buerkert, Rainer Georg Joergensen   +8 more
wiley   +1 more source

Real-Time Orbit Determination of Korean Navigation Satellite System based on Multi-GNSS Precise Point Positioning [PDF]

E3S Web of Conferences, 2019
This study proposes real-time orbit/clock determination of Korean Navigation Satellite System (KNSS), which employs the kinematic precise point positioning (PPP) solutions of multiple Global Navigation Satellite System (multi-GNSS) to compensate for ...
Kim Gimin, Oh Hyungjik, Park Chandeok, Seo Seungmo   +3 more
doaj   +1 more source

RINEXAV: GNSS global network selection open-source software based on qualitative analysis of RINEX files

SoftwareX, 2023
The determination of global geodetic parameters using Global Navigation Satellite System (GNSS) observations requires using a global, evenly distributed network of stations.
Filip Gałdyn, Radosław Zajdel, Krzysztof Sośnica   +2 more
doaj   +1 more source

Hourly Sea Level Prediction‐Based GNSS‐IR Inversions by Combining the Least Squares Learning Cross‐Checking Method With the Gaussian Kernel Model L2 Constraint and LSTM

Earth and Space Science, Volume 10, Issue 3, March 2023., 2023
Abstract Multisatellite systems and multi‐signal‐to‐noise ratio types provide a more prosperous data basis for the inversion of sea level by GNSS‐IR technology. However, there are few studies on data reconstruction of the retrieved sea level height. This study takes the SPBY station as an example and introduces the least squares learning cross‐checking
Naiquan Zheng, Hongzhou Chai, Yongchao Ma, Lingqiu Chen, Min Wang, Tengfei Bai   +5 more
wiley   +1 more source

Ride the trend: Is there spread momentum profit in the US commodity markets?

Journal of Agricultural Economics, Volume 74, Issue 1, Page 24-47, February 2023., 2023
Abstract Some previous researchers have argued that trading strategies based on calendar spread time series momentum (STSM) can deliver significant returns (Szymanowska et al. 2014; Boons and Prado 2019), which, if true, is at odds with the efficient market hypothesis. These arguments however, do not exclude the unrealisable futures contract roll yield
Quanbiao Shang, Teresa Serra, Philip Garcia   +2 more
wiley   +1 more source

An improved triple‐frequency cycle slip detection and repair method based on wavelet packet transform and adaptive threshold for BeiDou System satellite

IET Radar, Sonar &Navigation, Volume 17, Issue 1, Page 27-37, January 2023., 2023
Abstract Cycle slip detection and repair is one of the key factors of Global Navigation Satellite System carrier phase high precision positioning. Although various methods have been proposed to detect and repair the cycle slip, they are still limited by kinds of factors and the effect is not ideal, especially in real‐time triple‐frequency high precise ...
Mingkun Su, Yanxi Yang, Lei Qiao, Erxiao Liu, Huina Song, Chao Wu, Huan Zhang   +6 more
wiley   +1 more source

Precise Orbit and Clock Products of Galileo, BDS and QZSS from MGEX Since 2018: Comparison and PPP Validation

Remote Sensing, 2020
In recent years, the development of new constellations including Galileo, BeiDou Navigation Satellite System (BDS) and Quasi-Zenith Satellite System (QZSS) have undergone dramatic changes. Since January 2018, about 30 satellites of the new constellations
Xingxing Li, Yiting Zhu, Kai Zheng, Yongqiang Yuan, Gege Liu, Yun Xiong   +5 more
doaj   +1 more source

Galileo-based precise point positioning with different MGEX products

Measurement Science and Technology, 2020
Considering the remarkable progress of the Galileo constellation in recent years, the main objective of this study is to evaluate the performance of dual- and single-frequency Galileo-based precise point positioning (PPP), and its contribution to GPS and Galileo integration with different precise products generated by four analysis centers (ACs) within
Berkay Bahadur, Metin Nohutcu
openaire   +2 more sources

Design optimisation of low earth orbit constellation based on BeiDou Satellite Navigation System precise point positioning

IET Radar, Sonar &Navigation, Volume 16, Issue 8, Page 1241-1252, August 2022., 2022
Abstract The use of low earth orbit (LEO) satellites to enhance the performance of global navigation satellite system navigation and positioning services has become a popular research topic. In this study, NSGA‐III optimisation algorithm was used to design two hybrid configurations of 177 and 186 LEO constellations for enhancing the BeiDou Satellite ...
Jing Liu, Jinming Hao, Yan Yang, Zheyu Xu, Weiping Liu, Renzhe Wu   +5 more
wiley   +1 more source

What do relationships between extractable metals and soil organic carbon concentrations mean?

Soil Science Society of America Journal, Volume 86, Issue 2, Page 195-208, March/April 2022., 2022
Abstract Aluminum (Al)‐bearing and iron (Fe)‐bearing minerals, especially short‐range‐ordered (SRO) phases, are thought to protect soil organic C (SOC). However, it remains methodologically challenging to assess the influence of Al vs. Fe minerals or metal complexes.
Steven J. Hall, Aaron Thompson
wiley   +1 more source