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Articles de revues sur le sujet « Frequency transfer »

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Auteur : Grafiati
Publié le 14 mars 2023

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1

Yukun Luo, Yukun Luo, Shuhua Yan Shuhua Yan, Aiai Jia Aiai Jia, Chunhua Wei Chunhua Wei, Zehuan Li Zehuan Li, Enlong Wang Enlong Wang et and Jun Yang and Jun Yang. « Revisiting the laser frequency locking method using acousto-optic frequency modulation transfer spectroscopy ». Chinese Optics Letters 14, no 12 (2016) : 121401–5. http://dx.doi.org/10.3788/col201614.121401.

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Sun, Oliver M., et Robert Pinkel. « Energy Transfer from High-Shear, Low-Frequency Internal Waves to High-Frequency Waves near Kaena Ridge, Hawaii ». Journal of Physical Oceanography 42, no 9 (11 avril 2012) : 1524–47. http://dx.doi.org/10.1175/jpo-d-11-0117.1.

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Abstract Evidence is presented for the transfer of energy from low-frequency inertial–diurnal internal waves to high-frequency waves in the band between 6 cpd and the buoyancy frequency. This transfer links the most energetic waves in the spectrum, those receiving energy directly from the winds, barotropic tides, and parametric subharmonic instability, with those most directly involved in the breaking process. Transfer estimates are based on month-long records of ocean velocity and temperature obtained continuously over 80–800 m from the research platform (R/P) Floating Instrument Platform (FLIP) in the Hawaii Ocean Mixing Experiment (HOME) Nearfield (2002) and Farfield (2001) experiments, in Hawaiian waters. Triple correlations between low-frequency vertical shears and high-frequency Reynolds stresses, 〈uiw∂Ui/∂z〉, are used to estimate energy transfers. These are supported by bispectral analysis, which show significant energy transfers to pairs of waves with nearly identical frequency. Wavenumber bispectra indicate that the vertical scales of the high-frequency waves are unequal, with one wave of comparable scale to that of the low-frequency parent and the other of much longer scale. The scales of the high-frequency waves contrast with the classical pictures of induced diffusion and elastic scattering interactions and violates the scale-separation assumption of eikonal models of interaction. The possibility that the observed waves are Doppler shifted from intrinsic frequencies near f or N is explored. Peak transfer rates in the Nearfield, an energetic tidal conversion site, are on the order of 2 × 10−7 W kg−1 and are of similar magnitude to estimates of turbulent dissipation that were made near the ridge during HOME. Transfer rates in the Farfield are found to be about half the Nearfield values.
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Takiguchi, Hiroshi, Yasuhiro Koyama, Ryuichi Ichikawa, Tadahiro Gotoh, Atsutoshi Ishii, Thomas Hobiger et Mizuhiko Hosokawa. « VLBI Measurements for Frequency Transfer ». Proceedings of the International Astronomical Union 5, H15 (novembre 2009) : 225. http://dx.doi.org/10.1017/s1743921310008926.

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AbstractWe carried out the intercomparison experiments between VLBI, GPS and DMTD to show the VLBI can measure the right time difference. We produced the artificial change using by line stretcher. At the artificial change part, VLBI and DMTD show good agreement, less than 10ps. The quantity and sense of VLBI results match well with DMTD results. Consequently, the geodetic VLBI technique can measure the right time difference.
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Panfilo, Gianna, et Thomas E. Parker. « A theoretical and experimental analysis of frequency transfer uncertainty, including frequency transfer into TAI ». Metrologia 47, no 5 (8 septembre 2010) : 552–60. http://dx.doi.org/10.1088/0026-1394/47/5/005.

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Zhang, Hongyuan, Haoyun Wei, Honglei Yang et Yan Li. « Active laser ranging with frequency transfer using frequency comb ». Applied Physics Letters 108, no 18 (2 mai 2016) : 181101. http://dx.doi.org/10.1063/1.4948593.

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Zhang, Zhehao, et Lin Pan. « Galileo Time Transfer with Five-Frequency Uncombined PPP : A Posteriori Weighting, Inter-Frequency Bias, Precise Products and Multi-Frequency Contribution ». Remote Sensing 14, no 11 (26 mai 2022) : 2538. http://dx.doi.org/10.3390/rs14112538.

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Galileo satellites can broadcast signals on five frequencies, namely E1, E5A, E5B, E5 (A+B), and E6. The multi-frequency integration has become an emerging trend in Global Navigation Satellite System (GNSS) data processing. This study focused on the precise time transfer based on Galileo five-frequency uncombined precise point positioning (PPP), including the performance comparison of PPP time transfer with a priori and a posteriori weighting strategies, with different inter-frequency bias (IFB) dynamic models, and with the precise satellite products from different analysis centers, as well as the contribution of multi-frequency observations for time transfer. Compared with the a priori weighting strategy, the short-term frequency stability of time transfer adopting the Helmert variance component estimation method can be improved by 28.9–37.6% when the average time is shorter than 100 s. The effect of IFB dynamic models on Galileo five-frequency PPP time transfer is not obvious. When employing the post-processed precise satellite products from seven analysis centers, the accuracy of time transfer can be better than 0.1 ns, while an accuracy of 0.253 ns can be obtained in the real-time mode. At an average time of approximately 10,000 s, the post-processed time transfer with Galileo five-frequency PPP can provide a frequency stability of 3.283 × 10−14 to 3.459 × 10−14, while that in real-time mode can be 3.541 × 10−14. Compared with dual-frequency PPP results, the contribution of multi-frequency combination to the accuracy and frequency stability of time transfer is not significant, but multi-frequency PPP can achieve more reliable time transfer results when the signal quality is poor.
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Li, Qi, Liang Hu, Jinbo Zhang, Jianping Chen et Guiling Wu. « Fiber Radio Frequency Transfer Using Bidirectional Frequency Division Multiplexing Dissemination ». IEEE Photonics Technology Letters 33, no 13 (1 juillet 2021) : 660–63. http://dx.doi.org/10.1109/lpt.2021.3086299.

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Zhang, Xiang, Liang Hu, Xue Deng, Qi Zang, Jie Liu, Dongdong Jiao, Jing Gao et al. « All-Passive Cascaded Optical Frequency Transfer ». IEEE Photonics Technology Letters 34, no 8 (15 avril 2022) : 413–16. http://dx.doi.org/10.1109/lpt.2022.3164406.

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Jaekel, Marc-Thierry, et Serge Reynaud. « Time-Frequency Transfer with Quantum Fields ». Physical Review Letters 76, no 14 (1 avril 1996) : 2407–11. http://dx.doi.org/10.1103/physrevlett.76.2407.

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Pufall, M. R., W. H. Rippard, S. Kaka, T. J. Silva et S. E. Russek. « Frequency modulation of spin-transfer oscillators ». Applied Physics Letters 86, no 8 (21 février 2005) : 082506. http://dx.doi.org/10.1063/1.1875762.

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Jacob, A., E. Burkert, H. Brauns et K. Schünemann. « Dynamic transfer properties of frequency multipliers ». IEE Proceedings H Microwaves, Antennas and Propagation 133, no 3 (1986) : 175. http://dx.doi.org/10.1049/ip-h-2.1986.0031.

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Raupach, Sebastian M. F., et Gesine Grosche. « Chirped frequency transfer : a tool for synchronization and time transfer ». IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 61, no 6 (juin 2014) : 920–29. http://dx.doi.org/10.1109/tuffc.2014.2988.

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Ge, Yulong, Xinyun Cao, Fei Shen, Xuhai Yang et Shengli Wang. « BDS-3/Galileo Time and Frequency Transfer with Quad-Frequency Precise Point Positioning ». Remote Sensing 13, no 14 (9 juillet 2021) : 2704. http://dx.doi.org/10.3390/rs13142704.

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In this work, quad-frequency precise point positioning (PPP) time and frequency transfer methods using Galileo E1/E5a/E5b/E5 and BDS-3 B1I/B3I/B1C/B2a observations were proposed with corresponding mathematical models. In addition, the traditional dual-frequency (BDS-3 B1I/B3I and Galileo E1/E5a) ionospheric-free (IF) model was also described and tested for comparison. To assess the proposed method for time transfer, datasets selected from timing labs were utilized and tested. Moreover, the number of Galileo or BDS-3 satellites, pseudorange residuals, positioning accuracy and tropospheric delay at receiver end were all analyzed. The results showed that the proposed quad-frequency BDS-3 or Galileo PPP models could be used to time transfer, due to stability and accuracy identical to that of dual-frequency IF model. Furthermore, the quad-frequency models can provide potential for enhancing the reliability and redundancy compared to the dual-frequency time transfer method.
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Bourgoin, A., M. Zannoni, L. Gomez Casajus, P. Tortora et P. Teyssandier. « Relativistic modeling of atmospheric occultations with time transfer functions ». Astronomy & ; Astrophysics 648 (avril 2021) : A46. http://dx.doi.org/10.1051/0004-6361/202040269.

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Context. Occultation experiments represent unique opportunities to remotely probe the physical properties of atmospheres. The data processing involved in modeling the time and frequency transfers of an electromagnetic signal requires that refractivity be properly accounted for. On theoretical grounds, little work has been done concerning the elaboration of a covariant approach for modeling occultation data. Aims. We present an original method allowing fully analytical expressions to be derived up to the appropriate order for the covariant description of time and frequency transfers during an atmospheric occultation experiment. Methods. We make use of two independent powerful relativistic theoretical tools, namely the optical metric and the time transfer functions formalism. The former allows us to consider refractivity as spacetime curvature while the latter is used to determine the time and frequency transfers occurring in a curved spacetime. Results. We provide the integral form of the time transfer function up to any post-Minkowskian order. The discussion focuses on the stationary optical metric describing an occultation by a steadily rotating and spherically symmetric atmosphere. Explicit analytical expressions for the time and frequency transfers are provided at the first post-Minkowskian order and their accuracy is assessed by comparing them to results of a numerical integration of the equations for optical rays. Conclusions. The method accurately describes vertical temperature gradients and properly accounts for the light-dragging effect due to the motion of the optical medium. It can be pushed further in order to derive the explicit form of the time transfer function at higher order and beyond the spherical symmetry assumption.
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Xiong, Ying-Zi, Ding-Lan Tang, Yu-Xuan Zhang et Cong Yu. « Complete cross-frequency transfer of tone frequency learning after double training. » Journal of Experimental Psychology : General 149, no 1 (janvier 2020) : 94–103. http://dx.doi.org/10.1037/xge0000619.

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Zi, Fei, Xuejian Wu, Weicheng Zhong, Richard H. Parker, Chenghui Yu, Simon Budker, Xuanhui Lu et Holger Müller. « Laser frequency stabilization by combining modulation transfer and frequency modulation spectroscopy ». Applied Optics 56, no 10 (23 mars 2017) : 2649. http://dx.doi.org/10.1364/ao.56.002649.

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Nayfeh, A. H., et D. T. Mook. « Energy Transfer from High-Frequency to Low-Frequency Modes in Structures ». Journal of Mechanical Design 117, B (1 juin 1995) : 186–95. http://dx.doi.org/10.1115/1.2836454.

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A perspective of the mechanisms by which energy is transferred from high- to low-frequency modes is presented. The focus is on some recent experiments that reveal how a low-amplitude high-frequency excitation can produce a large-amplitude low-frequency response. Such a phenomenon is potentially harmful, if not catastrophic. Specifically, these experiments clarify the role of internal resonances, combination external and parametric resonances, and the interactions among modes of widely spaced frequencies.
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Nayfeh, A. H., et D. T. Mook. « Energy Transfer from High-Frequency to Low-Frequency Modes in Structures ». Journal of Vibration and Acoustics 117, B (1 juin 1995) : 186–95. http://dx.doi.org/10.1115/1.2838662.

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A perspective of the mechanisms by which energy is transferred from high- to low-frequency modes is presented. The focus is on some recent experiments that reveal how a low-amplitude high-frequency excitation can produce a large-amplitude low-frequency response. Such a phenomenon is potentially harmful, if not catastrophic. Specifically, these experiments clarify the role of internal resonances, combination external and parametric resonances, and the interactions among modes of widely spaced frequencies.
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19

Huang, S. D., Z. Q. Li et K. Y. Lu. « Transfer efficiency analysis of wireless power transfer system under frequency drift ». Journal of Applied Physics 117, no 17 (7 mai 2015) : 17E706. http://dx.doi.org/10.1063/1.4914951.

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Chen Faxi, 陈法喜, 李博 Li Bo et 郭宝龙 Guo Baolong. « 基于光纤频率传递的高精度时间传递方法 ». Acta Optica Sinica 42, no 15 (2022) : 1506002. http://dx.doi.org/10.3788/aos202242.1506002.

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Taylor, Stephanne, et David Straub. « Effects of Adding Forced Near-Inertial Motion to a Wind-Driven Channel Flow ». Journal of Physical Oceanography 50, no 10 (1 octobre 2020) : 2983–96. http://dx.doi.org/10.1175/jpo-d-19-0299.1.

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AbstractAn eddy-resolving primitive equation ocean model is used to examine energy transfers between frequency bands. Steady wind forcing is used to drive a geostrophic channel to which high-frequency winds are added. This excites near-inertial motion, which exerts a Reynolds stress on the slowly varying flow and acts to transfer kinetic energy between low and high frequencies. These transfers extract balanced energy primarily from the mesoscale. A frequency analysis of the transfers shows the bulk of the energy to be extracted from an intermediate range of frequencies that are large relative to the dominant kinetic energy–containing frequencies and small relative to the spectral gap separating high- and low-frequency bands. This phenomenon is robust and is found in systems spanning two orders of magnitude of kinetic energy. Direct calculation of potential energy transfers proved more difficult but nonetheless shows a similar low-to-high frequency transfer. For the parameter range considered, the ratio of potential-to-kinetic energy transfers is slightly larger than unity, and as such is consistent with balanced energy being extracted from horizontal scales that are somewhat larger than the relevant deformation radius.
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Li, Huicong, Wentao Zhang, Wenzhu Huang et Yanliang Du. « Design of low frequency fiber optic Fabry–Perot seismometer based on transfer function analysis ». Chinese Optics Letters 19, no 5 (2021) : 051201. http://dx.doi.org/10.3788/col202119.051201.

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Tiancheng Lin, Tiancheng Lin, Guiling Wu Guiling Wu, Hongwei Li Hongwei Li, Guoyong Wang Guoyong Wang et Jianping Chen Jianping Chen. « Passive phase noise compensation for fiber-optic radio frequency transfer with a nonsynchronized source ». Chinese Optics Letters 16, no 10 (2018) : 100602. http://dx.doi.org/10.3788/col201816.100602.

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Liu Jie, Gao Jing, Xu Guan-Jun, Jiao Dong-Dong, Yan Lu-Lu, Dong Rui-Fang, Jiang Hai-Feng, Liu Tao et Zhang Shou-Gang. « Study of optical frequency transfer via fiber ». Acta Physica Sinica 64, no 12 (2015) : 120602. http://dx.doi.org/10.7498/aps.64.120602.

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Kar, Ishan. « Frequency Domain Convolution of Rational Transfer Functions ». Journal of Applied Mathematics and Physics 10, no 06 (2022) : 2117–29. http://dx.doi.org/10.4236/jamp.2022.106144.

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Bertoluzzo, Manuele, et Giuseppe Buja. « Frequency Tuning in Inductive Power Transfer Systems ». Electronics 9, no 3 (23 mars 2020) : 527. http://dx.doi.org/10.3390/electronics9030527.

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Inductive power transfer systems (IPTSs) systems are equipped with compensation networks that resonate at the supply frequency with the inductance of the transmitting and receiving coils to both maximize the power transfer efficiency and reduce the IPTS power sizing. If the network and coil parameters differ from the designed values, the resonance frequencies deviate from the supply frequency, thus reducing the IPTS efficiency. To cope with this issue, two methods of tuning the IPTS supply frequency are presented and discussed. One method is aimed at making resonant the impedance seen by the IPTS power supply, the other one at making resonant the impedance of the receiving stage. The paper closes by implementing the first method in an experimental setup and by testing its tuning capabilities on a prototypal IPTS used for charging the battery of an electric vehicle.
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Skoda, Pavel, et Emilie Camisard. « Time and frequency transfer over optical networks ». Proceedings of the Asia-Pacific Advanced Network 35 (10 juin 2013) : 20. http://dx.doi.org/10.7125/apan.35.3.

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WHITFIELD, A. H. « Transfer function synthesis using frequency response data ». International Journal of Control 43, no 5 (mai 1986) : 1413–26. http://dx.doi.org/10.1080/00207178608933548.

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Budovsky, I. « Very low frequency ac-dc transfer standard ». IEEE Transactions on Instrumentation and Measurement 44, no 2 (avril 1995) : 367–69. http://dx.doi.org/10.1109/19.377854.

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Śliwczyński, Łukasz, Przemysław Krehlik et Marcin Lipiński. « Optical fibers in time and frequency transfer ». Measurement Science and Technology 21, no 7 (20 mai 2010) : 075302. http://dx.doi.org/10.1088/0957-0233/21/7/075302.

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Uitenbroek, H. « Multilevel Radiative Transfer with Partial Frequency Redistribution ». Astrophysical Journal 557, no 1 (10 août 2001) : 389–98. http://dx.doi.org/10.1086/321659.

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Jackson, Shira, Hiromitsu Sawaoka, Nishant Bhatt, Shreyas Potnis et Amar C. Vutha. « Laser frequency stabilization using a transfer interferometer ». Review of Scientific Instruments 89, no 3 (mars 2018) : 033109. http://dx.doi.org/10.1063/1.5012000.

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Rickard, Mark A., Andrei V. Pakoulev, Nathan A. Mathew, Kathryn M. Kornau et John C. Wright. « Frequency- and Time-Resolved Coherence Transfer Spectroscopy ». Journal of Physical Chemistry A 111, no 7 (février 2007) : 1163–66. http://dx.doi.org/10.1021/jp0677804.

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Fannjiang, Albert C. « Two-frequency radiative transfer and asymptotic solution ». Journal of the Optical Society of America A 24, no 8 (11 juillet 2007) : 2248. http://dx.doi.org/10.1364/josaa.24.002248.

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Weis, Rolf, et Peter Fromherz. « Frequency dependent signal transfer in neuron transistors ». Physical Review E 55, no 1 (1 janvier 1997) : 877–89. http://dx.doi.org/10.1103/physreve.55.877.

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Pesnell, W. Dean, Kazem Omidvar et Walter R. Hoegy. « Momentum transfer collision frequency of O+-O ». Geophysical Research Letters 20, no 13 (9 juillet 1993) : 1343–46. http://dx.doi.org/10.1029/93gl01597.

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Clivati, Cecilia, Anna Tampellini, Alberto Mura, Filippo Levi, Giuseppe Marra, Pauline Galea, André Xuereb et Davide Calonico. « Optical frequency transfer over submarine fiber links ». Optica 5, no 8 (25 juillet 2018) : 893. http://dx.doi.org/10.1364/optica.5.000893.

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Im, Soobin, Da Young Lim, Min Kyun Sohn et Yeongwook Kim. « Frequency of and Reasons for Unplanned Transfers From the Inpatient Rehabilitation Facility in a Tertiary Hospital ». Annals of Rehabilitation Medicine 44, no 2 (30 avril 2020) : 151–57. http://dx.doi.org/10.5535/arm.2020.44.2.151.

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Objective To characterize the patients in the inpatient rehabilitation facility who were transferred to acute care facilities and identify the frequency of and reasons for the unplanned transfer.Methods Medical records of patients admitted to the inpatient rehabilitation facility from October 2017 to December 2018 were reviewed. Patients were categorized according to their diagnoses. The included patients were divided into the unplanned transfer and control groups based on whether they required to transfer to another department for acute care before completing an uninterrupted rehabilitation course. The groups were compared in terms of sex, age, length of stay, admission sources, and disease groups. The reasons for unplanned transfers were classified based on medical or surgical conditions.Results Of the 1,378 patients were admitted to the inpatient rehabilitation facility, 1,301 satisfied inclusion criteria. Among them, 121 (9.3%) were unexpectedly transferred to the medical or surgical department. The unplanned transfer group had a higher age (69.54±12.53 vs. 64.39±15.32 years; p=0.001) and longer length of stay (85.69±66.08 vs. 37.81±31.13 days; p<0.001) than the control group. The top 3 reasons for unplanned transfers were infectious disease, cardiopulmonary disease, and orthopedic problem.Conclusion The unplanned transfer group had a significantly higher age and longer length of stay. The most common reason for the unplanned transfer was infectious disease. However, the proportions of those with orthopedic and neurological problems were relatively high. Therefore, further studies of these patient populations may help organize systematic strategies that are needed to reduce unplanned transfers to acute facilities for patients in rehabilitation facilities.
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He, Yabai, Brian J. Orr, Kenneth G. H. Baldwin, Michael J. Wouters, Andre N. Luiten, Guido Aben et R. Bruce Warrington. « Stable radio-frequency transfer over optical fiber by phase-conjugate frequency mixing ». Optics Express 21, no 16 (30 juillet 2013) : 18754. http://dx.doi.org/10.1364/oe.21.018754.

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Wei, Heng, Lin Lu, Longqiang Yu, Tao Pu, Xiaoyu Zhao, Juncheng Guo, Baofu Zhang et Chuanxin Wu. « Frequency crosstalk on fiber-optic radio frequency transfer under fiber temperature variation ». Optical Engineering 58, no 06 (27 juin 2019) : 1. http://dx.doi.org/10.1117/1.oe.58.6.066117.

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Fedyczak, Zbigniew, et Pawel Szczesniak. « Matrix-reactance frequency converters using an low frequency transfer matrix modulation method ». Electric Power Systems Research 83, no 1 (février 2012) : 91–103. http://dx.doi.org/10.1016/j.epsr.2011.09.017.

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Wang, Yajun, Yuhang Tian, Xiaocong Sun, Long Tian et Yaohui Zheng. « Noise transfer of pump field noise with analysis frequency in a broadband parametric downconversion process ». Chinese Optics Letters 19, no 5 (2021) : 052703. http://dx.doi.org/10.3788/col202119.052703.

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Han, Bangzhong. « Prospect Analysis of High Frequency Inverter Used in ESP ». Electronics Science Technology and Application 2 (3 décembre 2015) : 4. http://dx.doi.org/10.18686/esta.v2i1.2.

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It has been difficult for the old ESP to meet the new dust emission standards, and the update of the equipment costs a lot of money, therefore, how to reach a higher cost performance becomes the focus of attention. After researches we found that the replacement of the industrial frequency power with the high-frequency inverter of the ESP power can greatly improve the collection efficiency, with a high cost performance and a good prospect of application. The core idea of electrostatic precipitators of high frequency inverter is to transfer three-phase working frequency power into DC power, make use of modernized power electronic technologies and transfer DC power inverter into high frequency AC for control. We can see from this article that electrostatic precipitators of high frequency inverter enjoy the following strengths: (l) Three-phase rectifier transfers three-phase AC power into DC power; the inverter transfers DC voltage into high frequency AC voltage. This method enjoys great flexibility in the control. (2) The output form of high frequency AC voltage square wave in the inverter transfers step-up transformer into high frequency transformer. (3) Compared with the traditional power supply of controllable silicon working frequency phase control electrostatic precipitators, the electrostatic precipitators power supply of high frequency inverter adopts full-controllable power component: IGBT which features swift switch-on/off speed and in case of flashover in the electrostatic precipitators, it is switched off immediately. Research has discovered that high frequency inverter can greatly upgrade the dust collection efficiency, enjoy favorable advancement and very high performance-price ratio and realize broad application prospect.
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Hoffmann, Lea, Hisham Sabbagh, Andera Wichelhaus et Andreas Kessler. « Bracket transfer accuracy with two different three-dimensional printed transfer trays vs silicone transfer trays ». Angle Orthodontist 92, no 3 (4 janvier 2022) : 364–71. http://dx.doi.org/10.2319/040821-283.1.

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ABSTRACT Objectives To compare the transfer accuracy of two different three-dimensional printed trays (Dreve FotoDent ITB [Dreve Dentamid, Unna, Germany] and NextDent Ortho ITB [NextDent, Soesterberg, the Netherlands]) to polyvinyl siloxane (PVS) trays for indirect bonding. Materials and Methods A total of 10 dental models were constructed for each investigated material. Virtual bracket placement was performed on a scanned dental model using OnyxCeph (OnyxCeph 3D Lab, Chemnitz, Germany). Three-dimensional printed transfer trays using a digital light processing system three-dimensional printer and silicone transfer trays were produced. Bracket positions were scanned after the indirect bonding procedure. Linear and angular transfer errors were measured. Significant differences between mean transfer errors and frequency of clinically acceptable errors (&lt;0.25 mm/1°) were analyzed using the Kruskal–Wallis and χ2 tests, respectively. Results All trays showed comparable accuracy of bracket placement. NextDent exhibited a significantly higher frequency of rotational error within the limit of 1° (P = .01) compared with the PVS tray. Although PVS showed significant differences between the tooth groups in all linear dimensions, Dreve exhibited a significant difference in the buccolingual direction only. All groups showed a similar distribution of directional bias. Conclusions Three-dimensional printed trays achieved comparable results with the PVS trays in terms of bracket positioning accuracy. NextDent appears to be inferior compared with PVS regarding the frequency of clinically acceptable errors, whereas Dreve was found to be equal. The influence of tooth groups on the accuracy of bracket positioning may be reduced by using an appropriate three-dimensional printed transfer tray (Dreve).
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Marra, Diana, Beth Pethel, Gordon G. Churchward et June R. Scott. « The Frequency of Conjugative Transposition of Tn916 Is Not Determined by the Frequency of Excision ». Journal of Bacteriology 181, no 17 (1 septembre 1999) : 5414–18. http://dx.doi.org/10.1128/jb.181.17.5414-5418.1999.

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ABSTRACT Excision and formation of a covalently closed circular transposon molecule are required for conjugative transposition of Tn916 but are not the only factors that limit the frequency of conjugative transposition from one host to another. We found that in gram-positive bacteria, an increase in the frequency of excision and circularization of Tn916 caused by expression of integrase (Int) and excisionase (Xis) from a xylose-inducible promoter does not lead to an increase in the frequency of conjugative transposition. We also found that the concentration of Int and Xis in the recipient cell does not limit the frequency of conjugative transposition and that increased excision does not result in increased expression of transfer functions required to mobilize a plasmid containing the Tn916 origin of transfer. We conclude that in gram-positive hosts in which the Tn916 functions Int and Xis are overexpressed, the frequency of conjugative transposition is limited by the availability of transfer functions.
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Lazcano, A., J. J. Gutiérrez, L. A. Leturiondo, F. Pazos et J. Ruiz. « Case study : flicker transfer coefficient and frequency components ». Renewable Energy and Power Quality Journal 1, no 07 (avril 2009) : 537–41. http://dx.doi.org/10.24084/repqj07.413.

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Liu, Wei, K. Chau, W. Lam et Zhen Zhang. « Continuously Variable-Frequency Energy-Encrypted Wireless Power Transfer ». Energies 12, no 7 (3 avril 2019) : 1286. http://dx.doi.org/10.3390/en12071286.

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This paper proposes and implements a novel continuously variable-frequency energy-encrypted wireless power transfer (WPT) system for wireless energy security in multi-receiver applications. To prevent wireless energy from being illegally stolen, the proposed chaotic 2-D frequency-and-duration encryption (FDE) technology directly generates well-defended security keys to guarantee energy security. An LCC-compensated transmitter without using a switched-capacitor array is proposed to competently encrypt the wireless energy into burglarproof energy packages, which are decrypted only by authorized receivers. Then, the concept of the static variable capacitor (SVC) is presented to achieve dynamical impedance compensation for wireless energy decryption in authorized receivers with knowledge of security keys. Consequently, the proposed energy-encrypted SVC-based WPT system can flexibly encrypt and decrypt wireless energy packages in a continuous frequency-and-duration adjustment rather than in a discrete way, thus greatly improving energy security performance. Theoretical analysis, computer simulation and experimental results are provided to verify the feasibility of the proposed continuously energy-encrypted SVC-based WPT system.
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Zhang, Yiming, Zhengming Zhao et Kainan Chen. « Frequency Decrease Analysis of Resonant Wireless Power Transfer ». IEEE Transactions on Power Electronics 29, no 3 (mars 2014) : 1058–63. http://dx.doi.org/10.1109/tpel.2013.2277783.

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Yu, Jun, David G. Hasko et Arokia Nathan. « Frequency Selection for High Efficiency Wireless Power Transfer ». Journal of Display Technology 12, no 7 (juillet 2016) : 681–84. http://dx.doi.org/10.1109/jdt.2016.2521804.

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Levine, Judah. « A review of time and frequency transfer methods ». Metrologia 45, no 6 (décembre 2008) : S162—S174. http://dx.doi.org/10.1088/0026-1394/45/6/s22.

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