Results 121 to 130 of about 117,216 (290)

Frequency Comb Velocity-Modulation Spectroscopy

Physical Review Letters, 2011
We have demonstrated a new technique that provides massively parallel comb spectroscopy sensitive specifically to ions through the combination of cavity-enhanced direct frequency comb spectroscopy with velocity modulation spectroscopy. Using this novel system, we have measured electronic transitions of HfF+ and achieved a fractional absorption ...
Sinclair, Laura C., Cossel, Kevin C., Coffey, Tyler, Ye, Jun, Cornell, Eric A.   +4 more
openaire   +4 more sources

Use of antiemetics in early pregnancy 2012–2022: A cross‐sectional study

British Journal of Clinical Pharmacology, EarlyView.
Aim Nausea and vomiting in pregnancy impact quality of life, yet many pregnant women feel dismissed by healthcare professionals, despite the safety of first‐line antiemetic treatments for both mother and fetus. Therefore, this study aims to describe the prevalence of patient‐reported antiemetic use in early pregnancy in Copenhagen, Denmark, the changes
Katrine Bak Wraae, Nanna Roed Ballegaard, Mie Lærkeholm Hede, Line Buchgreitz, Ane Lilleøre Rom, Hanne Kristine Hegaard, Nina Olsén Nathan   +6 more
wiley   +1 more source

Scanning Micro-Mirror with an Electrostatic Spring for Compensation of Hard-Spring Nonlinearity

Micromachines, 2017
A scanning micro-mirror operated at the mechanical resonant frequency often suffer nonlinearity of the torsion-bar spring. The torsion-bar spring becomes harder than the linear spring with the increase of the rotation angle (hard-spring effect). The hard-
Takashi Izawa, Takashi Sasaki, Kazuhiro Hane   +2 more
doaj   +1 more source

Phylogenomics and Biogeography of the Eastern Asian–Eastern North American Disjunct Genus Hylodesmum (Fabaceae)

Biological Diversity, EarlyView.
Integrating data from plastid genomes, nrDNA, and 353 low‐copy nuclear genes, this study establishes a robust phylogenetic framework for Hylodesmum. This framework supports a taxonomic revision recognizing 18 species and reveals a complex pattern of bidirectional EA–ENA dispersal, with mammals as a plausible dispersal agent. ABSTRACT Phylogenomics with
Zhuqiu Song, Gang Yao, Chen Ren, Kaiwen Jiang, Dongxian Xu, Shijin Li   +5 more
wiley   +1 more source

Farey tree locking of terahertz quantum cascade laser frequency combs

Light: Science & Applications
Frequency combs show various applications in molecular fingerprinting, imaging, communications, and so on. In the terahertz frequency range, semiconductor-based quantum cascade lasers (QCLs) are ideal platforms for realizing the frequency comb operation.
Guibin Liu, Xuhong Ma, Kang Zhou, Binbin Liu, Lulu Zheng, Xianglong Bi, Shumin Wu, Yanming Lu, Ziping Li, Wenjian Wan, Zhenzhen Zhang, Junsong Peng, Ya Zhang, Heping Zeng, Hua Li   +14 more
doaj   +1 more source

Gaussian-shaped Optical Frequency Comb Generation for Microwave Photonic Filtering [PDF]

, 2011
Using only electro-optic modulators, we generate a 41-line 10-GHz Gaussian-shaped optical frequency comb. We use this comb to demonstrate apodized microwave photonic filters with greater than 43-dB sidelobe suppression without the need for a pulse shaper.
Hamidi, Ehsan, Leaird, Daniel E., Long, Christopher M., Song, Min Hyup, Supradeepa, V. R., Weiner, Andrew M., Wu, Rui   +6 more
core   +1 more source

Loss, persistence and reversal of phenotypic traits

Biological Reviews, EarlyView.
ABSTRACT The irreversibility of complex trait loss has long been a tenet of evolutionary biology. However, this idea is increasingly at odds with the numerous documented exceptions across the Tree of Life. We synthesise this growing body of evidence across a diverse array of taxa and traits, exploring the evolutionary conditions that enable ...
Giobbe Forni, Giuseppe Fusco, Filippo Nicolini, Heather Bruce, Andrea Luchetti   +4 more
wiley   +1 more source

Institutional Ownership and Corporate Sustainability Performance—A Meta‐Analysis

Business Strategy and the Environment, EarlyView.
ABSTRACT This study investigates the relationship between institutional ownership (IO) and corporate sustainability performance (SP), addressing inconsistent findings in prior research and clarifying the boundary conditions of this relationship by testing a defined set of potential moderators.
Hans Henrik Scherer, Rüdiger Hahn, Jan Endrikat   +2 more
wiley   +1 more source

Frequency Comb Effect on Chaos in Semiconductor Lasers, a Bifurcation Study

International Journal of Optics
This study investigates the effects of optical frequency comb injection on the chaotic dynamics of semiconductor lasers through a bifurcation analysis. By examining the behavior of semiconductor lasers under different comb parameters (i.e., the number of
Najm M. Al-Hosiny
doaj   +1 more source

Frequency comb transferred by surface plasmon resonance

Nature Communications, 2016
Combining frequency combs and plasmonics promises highly precise timing and frequency standards in nanoscale devices. Here, the authors experimentally transfer a frequency comb to surface plasmons and then return it to its original comb form with little ...
Xiao Tao Geng, Byung Jae Chun, Ji Hoon Seo, Kwanyong Seo, Hana Yoon, Dong-Eon Kim, Young-Jin Kim, Seungchul Kim   +7 more
doaj   +1 more source