Results 31 to 40 of about 296,485 (288)

The critical role of hot carrier cooling in optically excited structural transitions

npj Computational Materials, 2021
The hot carrier cooling occurs in most photoexcitation-induced phase transitions (PIPTs), but its role has often been neglected in many theoretical simulations as well as in proposed mechanisms.
Wen-Hao Liu, Jun-Wei Luo, Shu-Shen Li, Lin-Wang Wang   +3 more
doaj   +1 more source

Blind adaptive carrier phase recovery for QAM systems

Digital Signal Processing, 2016
AbstractThis paper provides a study of adaptive phase recovery in quadrature amplitude modulation (QAM) based communication systems. Here, we modify the traditional fourth-power phase recovery algorithm (FP-PRA) to propose three improved algorithms, and analyze their performances in the presence of additive white Gaussian noise, phase noise, frequency ...
Abrar, Shafayat, Zerguine, Azzedine, Nandi, Asoke K.   +2 more
openaire   +1 more source

Noise characterization of an Optical Frequency Comb using Offline Cross-Correlation

, 2016
Using an offline cross-correlation technique, we have analyzed the noise behavior of a new type of optical frequency comb (OFC), which is carrier envelope offset (CEO) free by configuration, due to difference frequency generation.
Champenois, Caroline, Collombon, Mathieu, Ferrand, Didier, Guyomarc'h, Didier, Hagel, Gaëtan, Houssin, Marie, Khayatzadeh, Ramin, Knoop, Martina, Morizot, Olivier   +8 more
core   +2 more sources

Achievable Mitigation of Nonlinear Phase Noise through Optimized Blind Carrier Phase Recovery [PDF]

2020 22nd International Conference on Transparent Optical Networks (ICTON), 2020
Partial mitigation of nonlinear phase noise by standard carrier phase recovery has been reported both, experimentally and through simulations. In this paper we quantify the achievable mitigation by using different implementations of the carrier phase recovery.
di Rosa, Gabriele, Richter, Andre
openaire   +1 more source

Revealing the structure of land plant photosystem II: the journey from negative‐stain EM to cryo‐EM

FEBS Letters, EarlyView.
Advances in cryo‐EM have revealed the detailed structure of Photosystem II, a key protein complex driving photosynthesis. This review traces the journey from early low‐resolution images to high‐resolution models, highlighting how these discoveries deepen our understanding of light harvesting and energy conversion in plants.
Roman Kouřil
wiley   +1 more source

Spatiotemporal and quantitative analyses of phosphoinositides – fluorescent probe—and mass spectrometry‐based approaches

FEBS Letters, EarlyView.
Fluorescent probes allow dynamic visualization of phosphoinositides in living cells (left), whereas mass spectrometry provides high‐sensitivity, isomer‐resolved quantitation (right). Their synergistic use captures complementary aspects of lipid signaling. This review illustrates how these approaches reveal the spatiotemporal regulation and quantitative
Hiroaki Kajiho, Shin Morioka, Junko Sasaki, Takehiko Sasaki   +3 more
wiley   +1 more source

Perancangan dan Realisasi Perangkat Keras Demodulator BPSK dengan Costas Loop

Techne, 2015
Pada tulisan ini akan dirancang dan direalisasikan suatu perangkat demodulator data berbasis BPSK (Binary Phase Shift Keying) menggunakan metode Costas Loop.
Budihardja Murtianta, Deddy Susilo, Arivia Aurelia Devina P.   +2 more
doaj   +1 more source

In situ molecular organization and heterogeneity of the Legionella Dot/Icm T4SS

FEBS Letters, EarlyView.
We present a nearly complete in situ model of the Legionella Dot/Icm type IV secretion system, revealing its central secretion channel and identifying new components. Using cryo‐electron tomography with AI‐based modeling, our work highlights the structure, variability, and mechanism of this complex nanomachine, advancing understanding of bacterial ...
Przemysław Dutka, Yuxi Liu, Stefano Maggi, Debnath Ghosal, Jue Wang, Prashant P. Damke, Stephen D. Carter, Wei Zhao, Sukhithasri Vijayrajratnam, Joseph P. Vogel, Carrie L. Shaffer, Grant J. Jensen   +11 more
wiley   +1 more source

The (Glg)ABCs of cyanobacteria: modelling of glycogen synthesis and functional divergence of glycogen synthases in Synechocystis sp. PCC 6803

FEBS Letters, EarlyView.
We reconstituted Synechocystis glycogen synthesis in vitro from purified enzymes and showed that two GlgA isoenzymes produce glycogen with different architectures: GlgA1 yields denser, highly branched glycogen, whereas GlgA2 synthesizes longer, less‐branched chains.
Kenric Lee, Dimitrios Bekiari, Sofia Doello, Karl Forchhammer   +3 more
wiley   +1 more source

QPSK-Modulation Modem Invariant to the Rotation of the Signal Constellation Plane

Electrical, Control and Communication Engineering, 2018
In order to increase the efficiency of dedicated frequency channels, i.e. to increase the specific data transfer rate, multipositional quadrature phase shift keying (QPSK, aka 4-PSK) should be used.
Sadchenko Andrey, Kushnirenko Oleg
doaj   +1 more source