Results 11 to 20 of about 72,789 (286)

Models and performance of SBAS and PPP of BDS

Satellite Navigation, 2022
Satellite Based Augmentation System (SBAS) is one of the services provided by the BeiDou Navigation Satellite System (BDS). It broadcasts four types of differential corrections to improve user application performance.
Junping Chen, Yize Zhang, Chao Yu, Ahao Wang, Ziyuan Song, Jianhua Zhou   +5 more
semanticscholar   +1 more source

Iterated amplitudes in the high-energy limit [PDF]

, 2008
We consider the high-energy limits of the colour ordered four-, five- and six-gluon MHV amplitudes of the maximally supersymmetric QCD in the multi-Regge kinematics where all the gluons are strongly ordered in rapidity.
A. Brandhuber, Claude Duhr, E.A. Kuraev, E.W.N Glover, J. Bartels, J.M. Drummond, J.M. Drummond, L.F. Alday, L.F. Alday, L.N. Lipatov, N. Beisert, R.C. Brower, R.C. Brower, V. Del Duca, V. Del Duca, V. Del Duca, V. Del Duca, Vittorio Del Duca   +17 more
core   +2 more sources

BDS/IMU Integrated Auto-Navigation System of Orchard Spraying Robot

Applied Sciences, 2022
To improve the accuracy and reliability of orchard spraying robots, an integrated navigation system was developed, consisting of a real-time kinematic positioning-Beidou satellite navigation system (RTK-BDS) receiver, an inertial measurement unit (IMU ...
Liang Zhang, Xinghui Zhu, Jingjing Huang, Jinqi Huang, Jingxin Xie, Xu Xiao, Gang Yin, Xiayu Wang, Ming Li, Kui Fang   +9 more
semanticscholar   +1 more source

The large-scale disk fraction of brown dwarfs in the Taurus cloud as measured with Spitzer [PDF]

, 2010
Aims. The brown dwarf (BD) formation process has not yet been completely understood. To shed more light on the differences and similarities between star and BD formation processes, we study and compare the disk fraction among both kinds of objects over a
A. Noriega-Crespo, Bate, Bate, Bertout, Bouy, C. McCabe, C. Pinte, Chabrier, D. Padgett, Damjanov, F. Ménard, Fazio, Goldsmith, Goodwin, Guieu, Guieu, Gutermuth, J.-L. Monin, K. Stappelfeld, L. Hillenbrand, L. Rebull, Lay, Luhman, Luhman, Luhman, Luhman, Luhman, Luhman, Luhman, Luhman, M. Fukagawa, M. Guedel, Mathis, P. Goldsmith, Padoan, Padoan, Pinte, Pinte, Pinte, Reach, Reipurth, S. Carey, S. Guieu, S. Terebey, Scholz, Scholz, Scholz, T. Brooke, T. Huard, Thies, Werner, Whyatt   +51 more
core   +4 more sources

Modeling and assessment of five-frequency BDS precise point positioning

Satellite Navigation, 2022
Since its full operation in 2020, BeiDou Satellite Navigation System (BDS) has provided global services with highly precise Positioning, Navigation, and Timing (PNT) as well as unique short-message communication.
Zhiyuan Wu, Qianxin Wang, Chao Hu, Zhihao Yu, Wei Wu   +4 more
semanticscholar   +1 more source

On the circum(sub)stellar environment of brown dwarfs in Taurus [PDF]

, 2007
Aims : We want to investigate whether brown dwarfs (BDs) form like stars or are ejected embryos. We study the presence of disks around BDs in the Taurus cloud, and discuss implications for substellar formation models.
A. Noriega-Crespo, Alexander, Allard, Andrews, Baraffe, Barrado y Navascués, Bate, Bate, Bate, Beckwith, Briceño, Briceño, C. Pinte, Chabrier, Chauvin, Cohen, D. L. Padgett, Delgado-Donate, Draine, Draine, Draine, Duchêne, F. Ménard, Fazio, Gomez, Goodwin, Goodwin, Goodwin, Guieu, Guieu, Hartmann, J.-L. Monin, Jayawardhana, Jayawardhana, Kenyon, Klein, Kroupa, Kroupa, L. M. Rebull, Lada, Liu, Luhman, Luhman, Luhman, Lépin, M. Fukagawa, M. Guedel, Martín, Meyer, Mizuno, Mohanty, Monin, Muzerolle, Natta, Padoan, Pascucci, Reach, Reipurth, Rieke, S. Guieu, S. J. Carey, Scholz, Sterzik, T. Huard, Werner, Whelan, White, Whitworth   +67 more
core   +5 more sources

Approaching zero : temporal effects of a restrictive antibiotic policy on hospital-acquired Clostridium difficile, extended-spectrum β-lactamase-producing coliforms and meticillin-resistant Staphylococcus aureus [PDF]

, 2013
A restrictive antibiotic policy banning routine use of ceftriaxone and ciprofloxacin was implemented in a 450-bed district general hospital following an educational campaign.
Christison, F., Corcoran, D.S., Dancer, S.J., Farmer, D., Kirkpatrick, P., Robertson, Chris   +5 more
core   +3 more sources

Analysis of BDS-3 PPP-B2b Positioning and Time Transfer Service

Remote Sensing, 2022
With the completion of the BeiDou global navigation satellite system (BDS-3), the BeiDou Navigation Satellite System Signal In Space Interface Control Document Precise Point Positioning Service Signal PPP-B2b (Version 1.0) was officially announced, and ...
Runzhi Zhang, Zaimin He, Langming Ma, Gongwei Xiao, Wei Guang, Yulong Ge, Xiangbo Zhang, Jihai Zhang, J. Tang, Xue-Qin Li   +9 more
semanticscholar   +1 more source

High-precision services of BeiDou navigation satellite system (BDS): current state, achievements, and future directions

Satellite Navigation
With the rapid development of technologies such as autonomous driving and robotic navigation, the demand for accurate and reliable positioning results with BDS has increased.
Weiguang Gao, Wei Zhou, Chengpan Tang, Xingxing Li, Yongqiang Yuan, Xiaogong Hu   +5 more
semanticscholar   +1 more source

BDS and GPS side-lobe observation quality analysis and orbit determination with a GEO satellite onboard receiver

GPS Solutions, 2022
Multi-GNSS combination can alleviate problems associated with GNSS-based geostationary earth orbit (GEO) satellite navigation and orbit determination (OD), such as GNSS availability and observation geometry deterioration.
Wenwen Li, Kecai Jiang, Min Li, Qile Zhao, M. Wang, Chuang Shi, Caijun Xu   +6 more
semanticscholar   +1 more source