Results 131 to 140 of about 23,934,500 (209)

Performance of ionospheric-free PPP time transfer models with BDS-3 quad-frequency observations

, 2020
The BeiDou Navigation Satellite System (BDS) has as achieved the status of a global navigation satellite system. Compared to BDS-2 satellites, BDS-3 satellites transmit B1C, B2a, and B2b signals but not B1I and B3I signals.
Yulong Ge, Shuo Ding, W. Qin, Feng Zhou, Xuhai Yang, Shengli Wang   +5 more
semanticscholar   +1 more source

Accounting BDS3–BDS2 inter-system biases for precise time transfer

, 2020
The rapid development of BDS not only brings opportunities but also new problems. This article has been verified that the biases exist between BDS-2 and BDS-3 precise point positioning time transfer.
W. Qin, Yulong Ge, Zhe Zhang, Hang Su, Pei Wei, Xuhai Yang   +5 more
semanticscholar   +1 more source

GPS time transfer

Proceedings of the IEEE, 1991
The authors describe the use of GPS (Global Positioning System) for time coordination. When GPS first became available, it provided a quantum leap in time coordination with little or no effort on the part of the user. However, workers realized that with more sophisticated analysis techniques even greater accuracy could be wrung from GPS.
W. Lewandowski, C. Thomas
openaire   +1 more source

Interhemispheric Transfer Time in Sportsmen

Journal of Motor Behavior, 2012
The authors' aim was to compare interhemispheric transfer time between 2 groups: highly skilled sportsmen and control subjects. Left- and right-handed individuals were included in the study. The Poffenberger paradigm was used to measure the crossed-uncrossed difference, representing the time to transfer information from one hemisphere to the other.
SEMPRINI, GABRIELE, Coggi D., Corballis M. C.   +2 more
openaire   +3 more sources

Timing intra-Fallopian transfer procedures

Reproductive BioMedicine Online, 2007
With the gradual decline in the use of zygote intra-Fallopian transfer (ZIFT), current practice is to offer ZIFT almost exclusively to patients with repeated implantation failure (RIF). For practical reasons, the procedure is sometimes deferred by 1 day and embryo intra-Fallopian transfer (EIFT) is performed. The aim of the present study was to compare
Ariel, Weissman, Ido, Eldar, Amir, Ravhon, Galia, Biran, Jacob, Farhi, Hana, Nahum, Abraham, Golan, David, Levran   +7 more
openaire   +2 more sources

Precise point positioning time transfer with multi-GNSS single-frequency observations

Measurement, 2019
The dual-frequency precise point positioning (DF-PPP) technique has been widely used for time transfer. Actually, DF GNSS receivers are much more expensive than single-frequency (SF) receivers.
Yulong Ge, Feng Zhou, Peipei Dai, W. Qin, Shengli Wang, Xuhai Yang   +5 more
semanticscholar   +1 more source

Intergenerational time transfers and childcare

Review of Economic Dynamics, 2003
Although intergenerational transfers of time in the form of grandparenting are substantial, little is known about their role and importance. In this paper, we calibrate an overlapping generations model extended to allow for both time and monetary transfers to the US economy. We use simulations to show that time transfers have important positive effects
Emanuela Cardia, Serena Ng
openaire   +1 more source

Multi-GNSS time transfer based on the CGGTTS

Metrologia, 2019
This paper studies the use of multiple GNSS constellations for time transfer. The performances of each constellation are compared to one another. We show that, with its current constellation, Galileo already provides time transfer results with the same ...
Katrijn Verhasselt, P. Defraigne
semanticscholar   +1 more source

Time Experience and Transference

Journal of the American Psychoanalytic Association, 1983
This paper has examined the historical developments in the understanding of the experience of time in normal and pathological development, with an emphasis on the differences between "objective" time, "subjective" time, the "timelessness" of the system Ucs., and "intrapsychic" time. Using a variety of perspectives--psychobiology, cognitive development,
openaire   +2 more sources

Multiple GNSS inter-system biases in precise time transfer

Measurement science and technology, 2019
Inter-system bias (ISB) is important for the fusion of multiple global navigation satellite system data. They should be estimated or corrected for precise position, navigation, and timing solutions.
R. Tu, Ju Hong, Pengfei Zhang, Rui Zhang, Lihong Fan, Jinhai Liu, Xiaochun Lu   +6 more
semanticscholar   +1 more source