Готові списки джерел за темами / Rotational echoes

Добірка наукової літератури з теми "Rotational echoes"

Автор: Grafiati
Опубліковано: 7 липня 2024
Оновлено: 7 липня 2024

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Зміст

  1. Статті в журналах
  2. Дисертації
  3. Частини книг
  4. Тези доповідей конференцій

Статті в журналах з теми "Rotational echoes":

1

van der Struijf, C., T. Ph Pelupessy, E. E. van Faassen, and Y. K. Levine. "Rotational Motion of Ca-ATPase Monitored by Electron Spin Echoes." Journal of Magnetic Resonance, Series B 111, no. 2 (May 1996): 158–67. http://dx.doi.org/10.1006/jmrb.1996.0074.

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2

Karlsson, Torgny, Michael Helmle, N. D. Kurur, and Malcolm H. Levitt. "Rotational resonance echoes in the nuclear magnetic resonance of spinning solids." Chemical Physics Letters 247, no. 4-6 (December 1995): 534–40. http://dx.doi.org/10.1016/s0009-2614(95)01257-5.

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3

Rosenberg, Dina, Ran Damari, Shimshon Kallush, and Sharly Fleischer. "Rotational Echoes: Rephasing of Centrifugal Distortion in Laser-Induced Molecular Alignment." Journal of Physical Chemistry Letters 8, no. 20 (October 6, 2017): 5128–35. http://dx.doi.org/10.1021/acs.jpclett.7b02215.

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4

Lu, Jian, Yaqing Zhang, Harold Y. Hwang, Benjamin K. Ofori-Okai, Sharly Fleischer, and Keith A. Nelson. "Nonlinear two-dimensional terahertz photon echo and rotational spectroscopy in the gas phase." Proceedings of the National Academy of Sciences 113, no. 42 (October 4, 2016): 11800–11805. http://dx.doi.org/10.1073/pnas.1609558113.

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Ultrafast 2D spectroscopy uses correlated multiple light−matter interactions for retrieving dynamic features that may otherwise be hidden under the linear spectrum; its extension to the terahertz regime of the electromagnetic spectrum, where a rich variety of material degrees of freedom reside, remains an experimental challenge. We report a demonstration of ultrafast 2D terahertz spectroscopy of gas-phase molecular rotors at room temperature. Using time-delayed terahertz pulse pairs, we observe photon echoes and other nonlinear signals resulting from molecular dipole orientation induced by multiple terahertz field−dipole interactions. The nonlinear time domain orientation signals are mapped into the frequency domain in 2D rotational spectra that reveal J-state-resolved nonlinear rotational dynamics. The approach enables direct observation of correlated rotational transitions and may reveal rotational coupling and relaxation pathways in the ground electronic and vibrational state.
5

SHARMA, BL. "Hailstorms near Nagpur -A radar study." MAUSAM 18, no. 2 (April 30, 2022): 255–66. http://dx.doi.org/10.54302/mausam.v18i2.4446.

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In the present study, which has been made by a Decca type 41 radar, it has been shown that the hailstorms over Kamptee situated at a distance of 10 n, miles towards northeast of the radar station had occurred due to the presence of a rotational echo with characteristic hook features, An attempt has been made to find out (a) the speed and direction of the movement of the rotational and non-rotational echoes and their collision courses in directional convergence, (b) to calculate the terminal velocity of the precipitation particles and the corresponding particle size from the streamers, associated with a prominent hook echo and (()) to suggest the probable time of occurrence and end of the hailstorm over Kamptee.
6

Watanabe, Jun-Ichi. "RADAR Observations of Leonids in Japan." Highlights of Astronomy 11, no. 2 (1998): 1020. http://dx.doi.org/10.1017/s153929960001950x.

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We are observing meteor showers using the MU radar located at Shigaraki, Japan. This is a Mesosphere, Stratosphere and Troposphere radar, belonging to the Kyoto University, with a frequency and a peak power of 46.5M.ffz and 1MW, respectively. This system is characterized by the versatility of the antenna array. By using four antennas out of 475 Yagi arrays together with four receiver channels, we can observe more than several hundred meteor echoes per hour. The beam applied at the meteor observation is a static “doughnut beam”, which is the rotational symmetrical pattern to the vertical line. This beam is effective enough to detect meteor echoes of which the zenith angle is smaller than about 50°, which characterizes the MU radar as an all sky monitoring radar of meteor echoes. For the low velocity meteors, most of the echoes satisfy a condition of the perpendicular reflection, and we can derive the position of the radiant point statistically, and succeeded its application for the Geminids (Watanabe et al. 1992a). For the high velocity meteors, most of the echoes are in the overdense condition. However, we can discriminate the echoes of a specific meteor shower out of the data by checking the echo duration, the height, the strength or the combination of them. We have been monitoring the Perseids from 1990, and succeeded to reveal the unusual activity in 1991 (Watanabe et al. 1992b). For the Leonids, we are continuing the observation from 1991. The drastic increase of the activity has been detected around 23h UT on November 17, 1994. The number of the observed long duration echoes, which came from possibly bright Leonids meteors, were 80 per hour. This should be the beginning of the Leonids activity toward the 1998-1999. We are planning to continue this observation until the end of the activity in the 2000’s.
7

Zhou, Zibo, Libing Jiang, and Zhuang Wang. "A novel image registration method for InISAR 3D imaging." MATEC Web of Conferences 232 (2018): 02044. http://dx.doi.org/10.1051/matecconf/201823202044.

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Image registration is a key intermediate step for Interferometric Inverse Synthetic Aperture Radar (InISAR) three-dimensional (3D) imaging. It arranges the same scatterers of the target on the same pixel cell in different ISAR images, which makes the interferometric processing carried on between the same scatterers to obtain its 3D coordinates. This paper proposes a novel ISAR image registration method of three steps. Firstly, chirp Fourier transform is used to estimate the rotational angular velocity of the target. Secondly, the compensation phase is constructed, according to the rotational angular velocity, to eliminate the wave path difference between different radars echoes. Finally, two-dimensional (2D) Fourier transform is used to yield registered ISAR images. The proposed method achieves the ISAR image registration through phase compensation in echo field, therefore, no extra computation is needed in image field. The experiment results demonstrate the advantages of the proposed method in precision, computation efficiency and practicability.
8

Karlsson, Torgny, and Malcolm H. Levitt. "Longitudinal rotational resonance echoes in solid state nuclear magnetic resonance: Investigation of zero quantum spin dynamics." Journal of Chemical Physics 109, no. 13 (October 1998): 5493–507. http://dx.doi.org/10.1063/1.477168.

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9

Bertmer, Marko, and Hellmut Eckert. "Dephasing of spin echoes by multiple heteronuclear dipolar interactions in rotational echo double resonance NMR experiments." Solid State Nuclear Magnetic Resonance 15, no. 3 (December 1999): 139–52. http://dx.doi.org/10.1016/s0926-2040(99)00050-8.

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10

Di Girolamo, Paolo, Noemi Franco, Marco Di Paolantonio, Donato Summa, and Davide Dionisi. "Atmospheric Thermodynamic Profiling through the Use of a Micro-Pulse Raman Lidar System: Introducing the Compact Raman Lidar MARCO." Sensors 23, no. 19 (October 6, 2023): 8262. http://dx.doi.org/10.3390/s23198262.

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It was for a long time believed that lidar systems based on the use of high-repetition micro-pulse lasers could be effectively used to only stimulate atmospheric elastic backscatter echoes, and thus were only exploited in elastic backscatter lidar systems. Their application to stimulate rotational and roto-vibrational Raman echoes, and consequently, their exploitation in atmospheric thermodynamic profiling, was considered not feasible based on the technical specifications possessed by these laser sources until a few years ago. However, recent technological advances in the design and development of micro-pulse lasers, presently achieving high UV average powers (1–5 W) and small divergences (0.3–0.5 mrad), in combination with the use of large aperture telescopes (0.3–0.4 m diameter primary mirrors), allow one to presently develop micro-pulse laser-based Raman lidars capable of measuring the vertical profiles of atmospheric thermodynamic parameters, namely water vapor and temperature, both in the daytime and night-time. This paper is aimed at demonstrating the feasibility of these measurements and at illustrating and discussing the high achievable performance level, with a specific focus on water vapor profile measurements. The technical solutions identified in the design of the lidar system and their technological implementation within the experimental setup of the lidar prototype are also carefully illustrated and discussed.
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Статті в журналах

Дисертації з теми "Rotational echoes":

1

Bournazel, Manon. "Dynamique collisionnelle sondée par alignement moléculaire post-impulsionnel." Electronic Thesis or Diss., Bourgogne Franche-Comté, 2024. http://www.theses.fr/2024UBFCK011.

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Au cours de ces trente dernières années, le développement des sources laser ultra courtes a permis d'accélérer la recherche sur le contrôle des mouvements de rotation des molécules par alignement moléculaire. En régime post-impulsionnel, lorsque la durée de l'impulsion laser est plus courte que la période rotationnelle de la molécule, une récurrence périodique de transitoires d'alignement se manifeste suite à l'excitation laser. Ces molécules, en interaction avec leur environnement, subissent des collisions internes qui atténuent l'amplitude de ces transitoires au cours du temps. L'étude de la disparition de cet alignement moléculaire en fonction du temps ou de la pression permet d'extraire des informations sur la relaxation des cohérences et des populations rotationnelles.Dans cette thèse nous nous intéressons à la dynamique collisionnelle de différents systèmes sondés via l'alignement moléculaire ou les échos rotationnels. Nous observons dans un premier temps des effets non séculaires et non markoviens dans le domaine temporel aux temps courts. Les échos rotationnels sont ensuite utilisés pour améliorer l'alignement de la molécule d'acétone très asymétrique et donc difficile à aligner. Enfin, pour s'affranchir de la dépendance de l'amplitude des échos par rapport au délai entre les deux impulsions laser et l'éclairement de la deuxième impulsion, nous mettons en place une nouvelle technique associant un modulateur spatial de lumière à un algorithme d'évolution pour créer une bi-impulsion dont les paramètres optimaux sont automatiquement ajustés afin de garder une amplitude d'écho constante
Over the past thirty years, the development of ultra-short laser sources has accelerated the research on the control of molecular rotational motions by molecular alignment. For field free molecular alignment, when the pulse duration of the laser is shorter than the rotationnal period of the molecule, a periodic reccurence of revivals follows the excitation by the laser pulse. These molecules, interacting with their environment, undergo internal collisions that attenuate the amplitude of these revivals over time. Studying the disappearance of this molecular alignment over time or pressure provides insights into the relaxation of coherences and rotational populations.In this thesis, we investigate the collisional dynamics of various systems, probed through molecular alignment or rotational echoes. First we observe nonsecular and non-Markovian effects in the temporal domain at short timescales. Rotationnal echoes are then used to improve the alignment of acetone which is highly asymmetric and hence challenging to align. In addition, to overcome the dependence of echo amplitude on the delay between the two laser pulses and the intensity of the second pulse, we introduce a new technique involving a spatial light modulator and a learning algorithm to create a bi-pulse. The optimal parameters of the bi-pulse are automatically adjusted to maintain the echo amplitude constant
2

Bürsing, Helge. "Photon-Echo-Spektroskopie zur Dynamik der Solvatation in Wasser und an Lipidmembran-Wasser-Grenzschichten." Doctoral thesis, 2002. http://hdl.handle.net/11858/00-1735-0000-0006-AE96-3.

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Частини книг з теми "Rotational echoes":

1

Pan, Yong. "The Study of Flouridated Hydroxyapatite by31P-19F Rotational-Echo, Double-Resonance NMR." In ACS Symposium Series, 168–81. Washington, DC: American Chemical Society, 1999. http://dx.doi.org/10.1021/bk-1999-0717.ch004.

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2

Kainz, Philipp, Harald Burgsteiner, Martin Asslaber, and Helmut Ahammer. "Robust Bone Marrow Cell Discrimination by Rotation-Invariant Training of Multi-class Echo State Networks." In Engineering Applications of Neural Networks, 390–400. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-23983-5_36.

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3

Callaghan, Paul T. "The Measurement of Motion Using Spin Echoes." In Principles of Nuclear Magnetic Resonance Microscopy, 328–70. Oxford University PressOxford, 1991. http://dx.doi.org/10.1093/oso/9780198539445.003.0006.

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Abstract In Chapter 5 the concept of image contrast was introduced. The nuclear magnetic resonance spectrum is rich in details which reveal the molecular environment of the nucleus. Chemical shift contrast and other more sophisticated methods of spectral editing can provide molecularly selective images while other schemes take advantage of the various characteristic time-scales in NMR, giving effects which are highly sensitive to the motion of the surrounding molecule. For example, the use of relaxation time contrast can differentiate molecules via their characteristic rotational motions. The suggestion that nuclear magnetic resonance could be used to measure molecular translational motion dates from the earliest days of this field of research.
4

Britt, R. D., and M. P. Klein. "Electron spin echo envelope modulation studies of mixed valence manganese complexes: applications to the catalytic manganese cluster of photosynthetic oxygen evolution." In Pulsed Magnetic Resonance: NMR, ESR, and Optics, 390–410. Oxford University PressOxford, 1992. http://dx.doi.org/10.1093/oso/9780198539629.003.0017.

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Abstract Professor Erwin Hahn’s 1950 discovery of spin echoes has opened a number of areas in experimental physics and chemistry [ 1] . Among these is the use of the electron spin echo envelope modulation (ESEEM) technique, such as described by Rowanet al.[2], which has become an important tool for measuring the spin transitions of magnetic nuclei magnetically coupled to EPRvisible electron paramagnets. In our applications, we use the ESEEM technique to study the coordination of ligands containing magnetic nuclei to metal centres active in biological catalysis. Details of experimental and theoretical aspects of the use of the ESEEM technique are provided in a number of good references [3-11] . In a brief review, the ESEEM technique requires the use of a pulsed EPR spectrometer, in which powerful microwave pulses are employed to affect large rotations of the net electron spin magnetization on a time-scale short compared to the relaxation processes which return the electron spin magnetization to equilibrium. For very narrow EPR signals, the EPR spectrum can be obtained by Fourier analysis of the Free Induction Decay (FID) following a single microwave pulse. However, the large bandwidths of most EPR signals, in particular those associated with transition metals, preclude such simple pulsed EPR experiments. In such cases, only a small fraction of an inhomogeneously broadened EPR line is excited by the microwave pulse.
5

GULLION, TERRY, and JACOB SCHAEFER. "Detection of Weak Heteronuclear Dipolar Coupling by Rotational-Echo Double-Resonance Nuclear Magnetic Resonance." In Advances in Magnetic and Optical Resonance Volume 13, 57–83. Elsevier, 1989. http://dx.doi.org/10.1016/b978-0-12-025513-9.50009-4.

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Тези доповідей конференцій з теми "Rotational echoes":

1

Rosenberg, Dina, and Sharly Fleischer. "Intrinsic Calibration of Molecular Alignment Using Rotational Echoes." In CLEO: QELS_Fundamental Science. Washington, D.C.: OSA, 2021. http://dx.doi.org/10.1364/cleo_qels.2021.fw3p.7.

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2

Rosenberg, Dina, Ran Damari, Shimshon Kallush, and Sharly Fleischer. "Rephasing the rotational centrifugal effect by laser-induced alignment echoes (Conference Presentation)." In Optical Sensing and Detection, edited by Francis Berghmans and Anna G. Mignani. SPIE, 2018. http://dx.doi.org/10.1117/12.2306675.

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3

van Voorst, J. D. W., D. Brandt, and B. L. van Hensbergen. "Coherent transients for the study of molecular dynamics in simple liquids." In International Conference on Ultrafast Phenomena. Washington, D.C.: Optica Publishing Group, 1986. http://dx.doi.org/10.1364/up.1986.wf4.

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The technique of Raman echo's in a vibrational degree of freedom of the nitrogen molecule is shortly described. The essential of this experiment is a phase-matching for a frequency box CARS configuration for (i) the two pumping as rephasing laser frequencies, and (ii) the probe laser pulse and the coherent anti-Stokes scattering, in such a way that there is also a definite phase-matching for pumping and rephasing pulse as well as for the probe pulse and the anti-Stokes pulse. This prohibits a three frequency CARS generation influencing the population during the rephasing pulse and gives a sensitive alignment (by four frequency box CARS) for the echo experiment. The Raman echo has been applied to a binary mixture of the van der Waals liquids nitrogen and argon. The absence of an echo in pure nitrogen and pure argon indicates an inhomogeneous broadening of the transition due to the many nearest neighbour configurations surrounding the reference molecule which, due to the difference in intermolecular interactions, give different force fields. The results are compared with molecular dynamics calculations. The nonexponential decay of the echo shows that in contrast to the high frequency component of the fast rotation reorientational motion, also a low frequency component, due to diffusive processes changing slowly the composition and configuration in the first two solvatation layers, is present.
4

Grunwald, Rüdiger, Max Liebmann, Alexander Treffer, Martin Bock, Thomas Seiler, Jürgen Jahns, and Thomas Elsässer. "Spectral self-imaging and Gouy rotation echos of propagating vortex pulse arrays." In Complex Light and Optical Forces XIII, edited by David L. Andrews, Enrique J. Galvez, and Jesper Glückstad. SPIE, 2019. http://dx.doi.org/10.1117/12.2507934.

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5

Lu, Jian, Yaqing Zhang, Harold Y. Hwang, Benjamin K. Ofori-Okai, Sharly Fleischer, and Keith A. Nelson. "Two-dimensional Terahertz Photon Echo and Rotational Spectroscopy in the Gas Phase." In International Conference on Ultrafast Phenomena. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/up.2016.utu1a.6.

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6

Barbarossa, S. "Target recognition using a set of scale, rotation and translation invariant features extracted directly from the radar echoes." In Radar Systems (RADAR 97). IEE, 1997. http://dx.doi.org/10.1049/cp:19971777.

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7

Li Xi-Min, Li Jing-Jing, Jia-Jia Sun, and Chuang-Ming Tong. "Wideband radar echo simulation of rotationally asymmetric target with non-ideal scattering centers." In 2016 IEEE International Conference on Microwave and Millimeter Wave Technology (ICMMT). IEEE, 2016. http://dx.doi.org/10.1109/icmmt.2016.7761803.

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8

Nguyen, Chi-Hai, Jing Zhu, Norio Tagawa, Masasumi Yoshizawa, and Takasuke Irie. "Performance improvement of ultrasonic range super-resolution based on phase rotation by dealing with echo distortion." In 2019 International Congress on Ultrasonics. ASA, 2019. http://dx.doi.org/10.1121/2.0001158.

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9

Wang, Qingbo. "An FrFT Based Real-Time Estimation of Moving Target Acceleration Method for FMCW Radar." In 13th International Conference on Computer Science, Engineering and Applications (CCSEA 2023). Academy and Industry Research Collaboration Center (AIRCC), 2023. http://dx.doi.org/10.5121/csit.2023.130515.

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This paper considers the problem of real-time estimating the moving target acceleration in frequency modulated continuous wave (FMCW) radar. Based on the accelerated target FMCW radar echo signal model, after utilizing KeyStone transform to eliminate the ef ect of range migration on the signal parameters estimation. An improved fractional Fourier transform (FrFT) and optimized the best matching rotation angle search strategy is proposed to estimate the chirp rate of doppler dimension echosignal related to the target acceleration. Compared with the traditional FrFT, the approach in this paper has less computation and significantly reduced processing time while ensuring estimation accuracy. The proposed method is demonstrated with simulation and measurement data.
10

Gladyshev, A. M., I. I. Popov, and G. L. Popova. "Principle of control of current of electro transmission line on basis of non-Faraday rotation of polarization vector of a photon echo." In SPIE Proceedings, edited by Vitaly V. Samartsev. SPIE, 2006. http://dx.doi.org/10.1117/12.675030.

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