Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.最新文献_第3页

Titanium doped cryogenic sapphire resonator oscillators 掺钛低温蓝宝石谐振振荡器

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-31 DOI: 10.1109/FREQ.2005.1573960

Y. Kersalé, N. Boubekeur, J. Hartnett, M. Tobar, N. Bazin, V. Giordano

引用次数: 4

Two-way satellite time transfer between USNO and PTB USNO和PTB之间的双向卫星时间传输

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-31 DOI: 10.1109/FREQ.2005.1573952

Dirk Piester, A. Bauch, J. Becker, T. Polewka, A. McKinley, L. Breakiron, A. Smith, B. Fonville, D. Matsakis

{"title":"Two-way satellite time transfer between USNO and PTB","authors":"Dirk Piester, A. Bauch, J. Becker, T. Polewka, A. McKinley, L. Breakiron, A. Smith, B. Fonville, D. Matsakis","doi":"10.1109/FREQ.2005.1573952","DOIUrl":"https://doi.org/10.1109/FREQ.2005.1573952","url":null,"abstract":"Two completely independent two-way time and frequency transfer (TWSTFT) links have been established between the institutions of USNO and PTB, with transponder frequencies in the Ku-band and X-band, respectively. The Ku-band link has some strategic importance, since currently it connects almost one half of the atomic clocks in the BIPM network that are employed for the realization of TAI. The X-band data are provided as a backup. To reach the full potential of TWSTFT, especially for time scale comparisons, repetitive calibrations of the links are necessary. Since 2002, USNO has scheduled semiannual calibration exercises. We report on the three calibration campaigns in 2004 and early 2005. New calibration values were determined in 2004 and 2005. For the first time, combined uncertainties below 1.0 ns for both links were achieved. A change of the TWSTFT transmission frequencies or satellite changes in general cause discontinuities in the series of time transfer data and render the previous calibration useless. We describe how we coped with two such events by bridging with X-band and GPS carrier phase data. The previous calibration could be preserved with sufficient accuracy of about a few tenths of a nanosecond","PeriodicalId":108334,"journal":{"name":"Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122834209","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 22

Frequency stabilization of the coupled opto-electronic oscillator 耦合光电振荡器的频率稳定

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-31 DOI: 10.1109/FREQ.2005.1574045

N. Yu, E. Salik, M. Tu, L. Maleki

引用次数: 0

Theoretical studying about the measurement of the C-field intensity in the optical pumped cesium frequency standard 光泵浦铯频率标准中c场强度测量的理论研究

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-31 DOI: 10.1109/FREQ.2005.1574001

Junhai Zhang, Fengzhi Wang, Donghai Yang

引用次数: 0

Demonstration and Observation of a Frequency Standard Based on an Expanding Cold Atoms Cloud of Cesium 基于膨胀铯冷原子云的频率标准的论证与观察

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-31 DOI: 10.1109/FREQ.2005.1573945

S. T. Muller, D. Magalhães, A. Bebeachibuli, M.S. Santos, V. Bagnato

引用次数: 3

Performance analysis and simulation of JTIDS network time synchronization JTIDS网络时间同步的性能分析与仿真

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-31 DOI: 10.1109/FREQ.2005.1574042

N. Wu, Hua Wang, Jingming Kuang

引用次数: 3

Optical links for ultra low phase noise microwave oscillators measurement 用于超低相位噪声微波振荡器测量的光学链路

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-31 DOI: 10.1109/FREQ.2005.1573991

B. Onillon, S. Constant, O. Liopis

引用次数: 17

A combination of TSM and AFM for investigating an interfacial interaction of particles with surfaces 结合TSM和AFM研究粒子与表面的界面相互作用

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-31 DOI: 10.1109/FREQ.2005.1573972

Qiliang Zhang, J. Desa, R. Lee, Guoliang Yang, K. Pourrezaei

{"title":"A combination of TSM and AFM for investigating an interfacial interaction of particles with surfaces","authors":"Qiliang Zhang, J. Desa, R. Lee, Guoliang Yang, K. Pourrezaei","doi":"10.1109/FREQ.2005.1573972","DOIUrl":"https://doi.org/10.1109/FREQ.2005.1573972","url":null,"abstract":"Interactions of microparticles and nanoparticles with various surfaces under different ambient conditions are of great importance to many applications such as micro-electrical-mechanical systems (MEMS), biomedical and chemical engineering, and have attracted broad interests in the last decade. However, there are only limited numbers of techniques currently available for interfacial particle analysis. In this paper, we propose to use a piezoelectric quartz sensor in a thickness shear mode (TSM) to characterize the interfacial interaction of a single microparticle with a surface. A theoretical model was developed based on the analysis of the various interaction forces, including Van der Waals (VDW) force, capillary force and electrostatic force, etc. The dependence of the particle-surface interaction forces on the particle size was demonstrated. Experimental results from a 5MHz TSM sensor have shown an average frequency shift of 0.5 Hz for a 40 mum stainless steel sphere, which indicated that a coupling strength between a sphere and a surface is about 1.3times104 N/m. An atomic force microscope (AFM) was used to provide a complementary tool to help study the interfacial interactions. Adhesion forces between particles and surfaces were measured and favorably compared with the simulation results. It is shown that a TSM sensor is capable of real-time analyzing an interaction of a single microparticle with a surface and an AFM is helpful to identify the effect of each individual interaction force. A combined TSM-AFM technique may create a novel measurement platform for characterization of nanoparticles and their interactions with surfaces","PeriodicalId":108334,"journal":{"name":"Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.","volume":"494 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116541428","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Adsorption studies with environmental significance using an acoustic wave sensor 利用声波传感器进行具有环境意义的吸附研究

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-31 DOI: 10.1109/FREQ.2005.1573904

A. Yamasaki, Jackson A. Oliveira, A. Duarte, M. Gomes

引用次数: 0

Enhanced or eLoran for time and frequency applications 增强或eLoran时间和频率应用

Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005. Pub Date : 2005-08-31 DOI: 10.1109/FREQ.2005.1574039

G. Linn Roth, P. Schick, J. Jacoby, C. Schweitzer, D. Gervasi, E. Wiley

{"title":"Enhanced or eLoran for time and frequency applications","authors":"G. Linn Roth, P. Schick, J. Jacoby, C. Schweitzer, D. Gervasi, E. Wiley","doi":"10.1109/FREQ.2005.1574039","DOIUrl":"https://doi.org/10.1109/FREQ.2005.1574039","url":null,"abstract":"The US Loran system is undergoing a modernization that will result in an enhanced or eLoran system. As a part of this modernization, three 5071A cesium clocks were installed at each transmitter, and state-of-the-art time and frequency clock measurement and control equipment was installed which uses GPS to steer the ensemble averaged Cs clocks to recover UTC (USNO) within 15 nanoseconds at each transmitter. When the conversion to eLoran is complete, the eLoran system will use time-of-transmission (TOT) control similar to GPS, and add a 9th pulse or Loran data channel (LDC) that will distribute UTC, leap second, and other information from each of the 29 transmitters in North America. eLoran provides performance comparable to GPS for numerous time and frequency applications, so eLoran can act as a traceable, infinite, and independent backup to GPS in these applications. This paper provides an overview of the eLoran modernization program and new eLoran antenna and receiver technology, and data from recent tests, including preliminary studies of Loran performance using H-field antennas located indoors","PeriodicalId":108334,"journal":{"name":"Proceedings of the 2005 IEEE International Frequency Control Symposium and Exposition, 2005.","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125626656","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5