Results 221 to 230 of about 4,787 (279)

Evaluation methods of BDS-3 ground-segment defensive capability oriented to satellite navigation countermeasures. [PDF]

Heliyon
Wang Y, Sun F, Wang X, Gao S.
europepmc   +1 more source

Cyanoacetamidobetaine—A Zwitterionic Nitrile Derivative

ChemistryOpen, EarlyView.
The reaction of sodium dicyanamide with betainium chloride in aqueous solution affords N‐cyano‐2‐(trimethylammonio)acetaminide (cyanoacetamidobetaine). Single crystal X‐ray diffraction reveals a monoclinic structure comprising a trimethylammonium head group connected to a cyanoacetaminide unit via a methylene bridge.
Pan Duan, Julia‐Maria Hübner, Florian Puls, Vitaliy Romaka, Hans‐Joachim Knölker, Michael Ruck   +5 more
wiley   +1 more source

Progress Toward Efficient Wide‐Gap Cu(In,Ga)(S,Se)2 Thin‐Film Solar Cells

Progress in Photovoltaics: Research and Applications, EarlyView.
Wide‐gap Cu (In,Ga)(S,Se)2 thin‐film solar cells are studied in view of their performance, limitations, and opportunities for further optimization. Different sources of open circuit voltage limitations were discussed and weighted. Interface recombination appears the main recombination channel, which however can be influenced heavy alkali treatment ...
Setareh Zahedi‐Azad, Roland Scheer, Dimitrios Hariskos, Stefan Paetel, Wolfram Hempel, Wolfram Witte, Hao Luo, Oana Cojocaru‐Mirédin, Mary Blankenship, Dirk Hauschild, Victor van Maris, Lothar Weinhardt, Clemens Heske, Thomas Unold, José A. Márquez, Jasmin Seeger, Florian Wilhelmi, Michael Hetterich, Thomas Niesen, Patrick Eraerds, Thomas Dalibor, Xiaowei Jin, Reinhard Schneider, Dagmar Gerthsen, Di Wang, Christian Kübel   +25 more
wiley   +1 more source

Massively parallel Hong-Ou-Mandel interference based on independent soliton microcombs. [PDF]

Sci Adv
Huang L, Wang W, Wang F, Wang Y, Zou C, Tang L, Little BE, Zhao W, Han Z, Yang J, Wang G, Chen W, Zhang W.   +12 more
europepmc   +1 more source

Improved SSA-Based GRU Neural Network for BDS-3 Satellite Clock Bias Forecasting. [PDF]

Sensors (Basel)
Liu H, Liu F, Kong Y, Yang C.
europepmc   +1 more source

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Digital lock-in amplifier for space rubidium atomic clock

Review of Scientific Instruments, 2021
In many low-noise applications, extracting information from the extremely noisy signal is required. This task can be accomplished by a lock-in amplifier if the frequency of the signal is known before detection. Error signal output from the physics package of the rubidium atomic clock (RbAC) is one of those noisy signals.
Pratik Jain, Priyanka Priya, T. V. S. Ram, K. S. Parikh, Thejesh N. Bandi   +4 more
openaire   +2 more sources

Rubidium atomic clock with drift compensation

CPEM 2010, 2010
This paper shows the results of an automatic system that compensates drifts of rubidium atomic clocks, comparing to GPS. This leads to high stability in large time and low noise in short time.
Leonardo Trigo, Daniel Slomovitz
openaire   +1 more source

All-Optical Integrated rubidium Atomic Clock

2011 Joint Conference of the IEEE International Frequency Control and the European Frequency and Time Forum (FCS) Proceedings, 2011
We report on progress in the development of an All-Optical Integrated Micro-Primary Atomic Clock (AO-IMPAC). The operattion of the clock is based on an inhomogeneously broadened rubidium optical transition used for stabilization of a Kerr optical frequency comb generated in a high-Q whispering gallery mode (WGM) microresonator. We have demonstrated the
L. Maleki, A. A. Savchenkov, V. S. Ilchenko, W. Liang, D. Eliyahu, A. B. Matsko, D. Seidel, N. P. Wells, J. C. Camparo, B. Jaduszliwer   +9 more
openaire   +1 more source

Atomic phase delay in a rubidium atomic clock

1993 IEEE International Frequency Control Symposium, 2002
The phase delay that exists between the oscillating atomic system and the probing microwave field in a rubidium atomic clock is examined. This phase delay must be accounted for in the feedback control circuitry of the clock in order to maximize the device's short-term stability.
J.C. Camparo, R.P. Frueholz
openaire   +1 more source

CPT atomic clock based on rubidium 85

EFTF-2010 24th European Frequency and Time Forum, 2010
We present a compact physics package based on coherent population trapping (CPT) in rubidium 85. The architecture of the package is described along with results obtained using optical- and microwave spectroscopy. We also report the stability of the CPT resonance to variations in operating parameters such as microwave modulation power and vapour cell ...
C. Schori, G. Mileti, B. Leuenbeger, P. Rochat   +3 more
openaire   +1 more source