Results 21 to 30 of about 1,623,042 (284)

Frequency chirped Fourier-Transform spectroscopy

Communications Physics, 2023
AbstractFast (sub-second) spectroscopy with high spectral resolution is of vital importance for revealing quantum chemistry kinetics of complex chemical and biological reactions. Fourier transform (FT) spectrometers can achieve high spectral resolution and operate at hundreds of ms time scales in rapid-scan mode.
Sergej Markmann, Martin Franckié, Mathieu Bertrand, Mehran Shahmohammadi, Andres Forrer, Pierre Jouy, Mattias Beck, Jérôme Faist, Giacomo Scalari   +8 more
openaire   +4 more sources

Time‐frequency synchroextracting transform [PDF]

IET Signal Processing, 2021
Abstract The study proposes a novel time‐frequency analysis technique, titled time‐frequency synchroextracting transform which enhances the accuracy of synchroextracting transform. The synchroextracting transform is a powerful postprocessing method that sharpens the energy distribution of spectrogram.
Ran Zhang, Xingxing Liu, Yongjun Zheng, Haotun Lv, Baosheng Li, Shenghui Yang, Yu Tan   +6 more
openaire   +2 more sources

High Frequency Transformers for Solid-State Transformer Applications

Applied Sciences, 2023
This paper focuses on the study of the high frequency transformer incorporated in solid- state transformers, specifically on the development of the steps that enable the design of an optimized high frequency transformer and its equivalent model based on the desired characteristics.
Santos, Nuno, Chaves, Miguel, Gamboa, Paulo, Cordeiro, Armando, Santos, Nelson, Pinto, Sónia Ferreira   +5 more
openaire   +3 more sources

Novel Sub-Harmonic Injection-Locked Balanced Oscillator [PDF]

, 2001
A novel sub-harmonic injection-locked balanced oscillator is proposed. The circuit provides two outputs with a 180° ° phase difference by employing a transmission line section for impedance transformation to meet the oscillation conditions.
Chongcheawchamnan, M., Robertson, I. D., Siripon, N.   +2 more
core   +1 more source

A dual-band RF energy harvesting circuit using 4th order dual-band matching network

Cogent Engineering, 2017
A novel compact rectifier for dual-band operation in the RF energy harvesting is presented. The circuit comprises a 4th order dual-band impedance matching and a single-series circuit with one double diode, both are integrating into a compact shape to ...
Sachin Agrawal, Manoj S. Parihar, P.N. Kondekar   +2 more
doaj   +1 more source

Unitary relations in time-dependent harmonic oscillators [PDF]

, 1999
For a harmonic oscillator with time-dependent (positive) mass and frequency, an unitary operator is shown to transform the quantum states of the system to those of a harmonic oscillator system of unit mass and time-dependent frequency, as well as ...
Caldirola P, Colegrave R K, Colegrave R K, Dae-Yup Song, Ermakov V, Feynman R P, Haar D T, Hasse R W, Husimi K, Kanai E, Kerner E H, Leach P G L, Leach P G L, Lee M-H, Lewis H R, Lewis H R, Li F-l, Maamache M, Mostafazadeh A   +18 more
core   +2 more sources

Broadband Extraordinary Transmission in a Single Sub-wavelength Aperture [PDF]

, 2010
Coordinate transformation is applied to design an all-dielectric device for Extraordinary Transmission (ET) in a single sub-wavelength slit. The proposed device has a broadband feature and can be applied from microwave to visible frequency bands.
Argyropoulos, Aydin, Bilotti, Cakmak, Dunbar, Ebbesen, Francisco Medina, García-de-Abajo, García-Vidal, García-Vidal, Genet, Leonhardt, Lezec, Pendry, Pendry, Pendry, Pendry, Pendry, Porto, Schurig, Valdivia-Valero, Wenxuan Tang, Yang Hao, Zhao   +23 more
core   +2 more sources

Piezoelectric transducer design for electric power generation

Revista UIS Ingenierías, 2019
Working on alternatives for harnessing and transforming different forms of energy in a clean and efficient way, like piezoelectric phenomena, allows considering collecting energy that is commonly wasted.  For example, the piezoelectricity facilitates the
Edwin Forero-García, Oscar Gelvez-Lizarazo, Carlos Torres-Pinzón   +2 more
doaj   +1 more source

Establishment of A Simple and Efficient Agrobacterium-mediated Genetic Transformation System to Chinese Cabbage (Brassica rapa L. ssp. pekinensis)

Horticultural Plant Journal, 2021
Chinese cabbage, belonging to Brassica rapa species, is an important vegetable in Eastern Asia. It is well known that Chinese cabbage is quite recalcitrant to genetic transformation and the transgenic frequency is generally low.
Xiaonan Li, Haiyan Li, Yuzhu Zhao, Peixuan Zong, Zongxiang Zhan, Zhongyun Piao   +5 more
doaj   +1 more source

Short-time Fourier transform laser Doppler holography [PDF]

, 2013
We report a demonstration of laser Doppler holography at a sustained acquisition rate of 250 Hz on a 1 Megapixel complementary metal-oxide-semiconductor (CMOS) sensor array and image display at 10 Hz frame rate.
Atlan, Michael, Samson, Benjamin
core   +4 more sources