Results 41 to 50 of about 425,883 (279)

Large Scale Structure Formation with Global Topological Defects. A new Formalism and its implementation by numerical simulations [PDF]

, 1995
We investigate cosmological structure formation seeded by topological defects which may form during a phase transition in the early universe. First we derive a partially new, local and gauge invariant system of perturbation equations to treat microwave ...
A.N. Taylor, D. Bennett, D. Coulson, D. Scott, E.J. Groth, E.J. Wollack, E.L. Wright, E.L. Wright, G. Efstathiou, G.F. Smoot, G.F.R.S. Ellis, H. Kodama, I. Chuang, J. Borrill, J. Borrill, J. Holtzman, J.A. Peacock, J.C.R Magueijo, J.M. Stewart, J.P. Ostriker, K.B. Fisher, K.M. Gorski, K.M. Gorski, M. Bruni, M. Davis, M.J. Devlin, N. Bahcall, N. Sugiyama, N. Turok, N. Turok, P. Meinhold, P. Mészáros, P.J.E. Peebles, R. Cen, R. Durrer, R. Durrer, R. Durrer, R. Durrer, R. Durrer, R. Durrer, Ruth Durrer, S. Xiang, T. Gaier, T.W.B. Kibble, U.-L. Pen, W. Press, W.H. Press, Y. Choquet-Bruhat, Zhi-Hong Zhou   +48 more
core   +3 more sources

Analysis of the BDGIM Performance in BDS Single Point Positioning

Remote Sensing, 2021
The broadcast ionospheric model is mainly used to correct the ionospheric delay error for single-frequency users. Since the BeiDou global ionospheric delay correction model (BDGIM) is a novel broadcast ionospheric model for BDS-3, its performance was ...
Guangxing Wang, Zhihao Yin, Zhigang Hu, Gang Chen, Wei Li, Yadong Bo   +5 more
doaj   +1 more source

MGR-DCB: A Precise Model for Multi-Constellation GNSS Receiver Differential Code Bias [PDF]

Journal of Navigation, 2015
In this study, we develop a Multi-constellation Global Navigation Satellite System (GNSS) Receiver Differential Code Bias (MGR-DCB) model. The model estimates the receiver DCBs for the Global Positioning System (GPS), BeiDou and Galileo signals from the ionosphere-corrected geometry-free linear combinations of the code observations. In order to account
Mohamed Abdelazeem, Rahmi N. Çelik, Ahmed El-Rabbany   +2 more
openaire   +1 more source

Statistics of Weak Gravitational Lensing in Cold Dark Matter Models; Magnification Bias on Quasar Luminosity Functions [PDF]

, 1999
We compute statistical properties of weak gravitational lensing by large-scale structure in three Cold Dark Matter models. We use a P$^3$M $N$-body code to simulate the formation and evolution of large-scale structure in the universe.
Babul A., Bartelmann M., Bartelmann M., Bernardeau F., Bliokh P. V., Boyle B. J., Ehlers J., Eke V. R., Frieman J. A., Hawkins M. R. S., Hugo Martel, Jaroszynski M., Jaroszynski M., Nakamura T. T., Peacock J. A., Peacock J. A., Schneider P., Schneider P., Schneider P., Takashi Hamana, Tomita K., Toshifumi Futamase, Viana P. P., Villumsen J. V.   +23 more
core   +3 more sources

A Novel Method to Estimate Multi-GNSS Differential Code Bias without Using Ionospheric Function Model and Global Ionosphere Map

Remote Sensing, 2022
Global navigation satellite system (GNSS) differential code bias (DCB) is one of main errors in ionospheric modeling and applications. Accurate estimation of multiple types of GNSS DCBs is important for GNSS positioning, navigation, and timing, as well ...
Qisheng Wang, Shuanggen Jin, Xianfeng Ye
doaj   +1 more source

Comparative Effectiveness of Step-up Therapies in Children with Asthma Prescribed Inhaled Corticosteroids : A Historical Cohort Study [PDF]

, 2017
This work was supported by the Respiratory Effectiveness Group. Acknowledgments We thank the Respiratory Effectiveness Group for funding this work, Annie Burden for assistance with statistics, and Simon Van Rysewyk and Lisa Law for assistance with ...
Murray, Claire S., Price, David B., Richardson, Kathryn, Thomas, Mike, Turner, Steve W.   +4 more
core   +2 more sources

Estimation and Analysis of BDS2 and BDS3 Differential Code Biases and Global Ionospheric Maps Using BDS Observations

Remote Sensing, 2021
Following the continuous and stable regional service of BDS2, the BDS3 officially announced its global service in July 2020. To fully take advantage of the new multi-frequency BDS3 signals in ionosphere sensing and positioning, it is essential to ...
Min Li, Yunbin Yuan
doaj   +1 more source

Calibration and Impact of BeiDou Satellite-Dependent Timing Group Delay Bias

Remote Sensing, 2020
The accuracy of the timing group delay (TGD) transmitted in the broadcast ephemeris is an important factor that affects the service performance of a GNSS system.
Yize Zhang, Hu Wang, Junping Chen, Ahao Wang, Lingdong Meng, Ershen Wang   +5 more
doaj   +1 more source

JIDT: An information-theoretic toolkit for studying the dynamics of complex systems [PDF]

, 2014
Complex systems are increasingly being viewed as distributed information processing systems, particularly in the domains of computational neuroscience, bioinformatics and Artificial Life. This trend has resulted in a strong uptake in the use of (Shannon)
Lizier, Joseph T.
core   +2 more sources

Stressful Events Reported by Childhood Cancer Survivors and Community Controls From the St. Jude Lifetime (SJLIFE) Cohort: A Mixed Method Study

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Introduction Characterizing stressful events reported by childhood cancer survivors experienced throughout the lifespan may help improve trauma‐informed care relevant to the survivor experience. Methods Participants included 2552 survivors (54% female; 34 years of age) and 469 community controls (62% female; 33 years of age) from the St.
Megan E. Ware, Colter K. Clayton, Fang Wang, Sedigheh Mirzaei, Kyla Shelton, Tara M. Brinkman, Victoria Willard, Katianne M. Howard Sharp, Kevin Krull, Lindsay F. Schwartz, Melissa M. Hudson, Gregory T. Armstrong, Kirsten K. Ness, Rachel T. Webster   +13 more
wiley   +1 more source