Results 71 to 80 of about 723,859 (290)

Tailoring Chirp in Spin-Lasers

, 2012
The usefulness of semiconductor lasers is often limited by the undesired frequency modulation, or chirp, a direct consequence of the intensity modulation and carrier dependence of the refractive index in the gain medium.
Chuang S. L., Coldren L. A., Guilhem Boéris, Igor Žutić, Jeongsu Lee, Karel Výborný, Yariv A., Žutić I.   +7 more
core   +1 more source

OFDM With Hybrid Number and Index Modulation [PDF]

IEEE Access, 2020
A novel transmission scheme is introduced for efficient data transmission by conveying additional information bits through jointly changing the index and number of active subcarriers within each orthogonal frequency division multiplexing (OFDM) subblock. The proposed scheme is different from the conventional OFDM-subcarrier number modulation (OFDM-SNM)
Ahmad M. Jaradat, Jehad M. Hamamreh, Huseyin Arslan   +2 more
openaire   +6 more sources

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

Index Modulation-Aided Unsourced Random Access in the Block-Fading Channel

IEEE Open Journal of the Communications Society
In this article, we propose three index modulation (IM) aided unsourced random access schemes in the block-fading multiple-antenna channel. In all the proposed schemes, the signal frame is partitioned into multiple time slots, and only part of time slots
Yaoxin Gao, Jianping Zheng
doaj   +1 more source

Enhanced Optical-OFDM With Index and Dual-Mode Modulation for Optical Wireless Systems

IEEE Access, 2020
In this article, we introduce intensity modulation and direct detection compatible enhanced optical-orthogonal frequency division multiplexing with index modulation (EO-OFDM-IM) schemes.
Ali Waqar Azim, Yannis Le Guennec, Marwa Chafii, Laurent Ros   +3 more
doaj   +1 more source

A Detailed Study of 2S 0114+650 with the RXTE [PDF]

, 2008
We present the results of a detailed study of the high mass X-ray binary 2S 0114+650 made with the pointed instruments onboard the Rossi X-ray Timing Explorer.
Aab, Apparao, Barlow, Blondin, Bonning, Chevalier, Corbet, Corral, Crampton, Crowther, Davies, De Luca, den Hartog, Ebisawa, Farrell, Farrell, Filippova, Finley, Finley, George, Gruber, Grundstrom, Haberl, Hall, Harding, Heindl, Hudec, Ikhsanov, Jahoda, Koenigsberger, Koenigsberger, Koenigsberger, Li, Masetti, Mattana, Meynet, Mukherjee, Nagase, Naik, Ogilvie, P. M. O'Neill, R. K. Sood, Reig, Rothschild, S. A. Farrell, S. Dieters, Schönherr, Sood, Soong, Taylor, Thompson, van Kerkwijk, Wang, Wasserman, Wen, White, Yamauchi   +56 more
core   +1 more source

Enteropathogenic E. coli shows delayed attachment and host response in human jejunum organoid‐derived monolayers compared to HeLa cells

FEBS Letters, EarlyView.
Enteropathogenic E. coli (EPEC) infects the human intestinal epithelium, resulting in severe illness and diarrhoea. In this study, we compared the infection of cancer‐derived cell lines with human organoid‐derived models of the small intestine. We observed a delayed in attachment, inflammation and cell death on primary cells, indicating that host ...
Mastura Neyazi, Pilar Samperio Ventayol, Natalie Burkard, Nicolas Schlegel, Carmen Aguilar, Sina Bartfeld   +5 more
wiley   +1 more source

OFDM transmission scheme with subcarrier supply index modulation

Tongxin xuebao, 2023
To address the drawback that subcarrier activation pattern (SAP) of the orthogonal frequency division multiplexing with index modulation (OFDM-IM) cannot match the binary numbers which affects the system performance, the orthogonal frequency division ...
Yi GUO, Yiqing WANG, Yuanyuan FAN, Gang LIU   +3 more
doaj  

Reciprocal control of viral infection and phosphoinositide dynamics

FEBS Letters, EarlyView.
Phosphoinositides, although scarce, regulate key cellular processes, including membrane dynamics and signaling. Viruses exploit these lipids to support their entry, replication, assembly, and egress. The central role of phosphoinositides in infection highlights phosphoinositide metabolism as a promising antiviral target.
Marie Déborah Bancilhon, Bruno Mesmin
wiley   +1 more source

Secure Uplink IM-OFDMA With Artificial IQ Imbalance

IEEE Access, 2023
This study proposes a novel secure uplink index modulation-based orthogonal frequency division multiple access (IM-OFDMA) systems using artificial in-phase and quadrature imbalance (A-IQI).
Ozgur Alaca, Saud Althunibat, Serhan Yarkan, Scott L. Miller, Khalid A. Qaraqe   +4 more
doaj   +1 more source