Results 61 to 70 of about 13,368 (247)

Joint Frequency and Time Transfer Over Optical Fiber With High-Precision Delay Variation Measurement Using a Phase-Locked Loop

IEEE Photonics Journal, 2019
We demonstrate a simultaneous frequency and time reference dissemination system over 80 km fiber with a phase-locked loop. The phase fluctuation of the transferred radio-frequency (RF) signal is compensated by adjusting the frequency of the ...
Xiaocheng Wang, Wei Wei, Zhangweiyi Liu, Daming Han, Nan Deng, Lingwei Yang, Weilin Xie, Yi Dong   +7 more
doaj   +1 more source

Integrating developmental and macroevolutionary approaches reveals a staminodial origin of all alternisepalous organs in Caryophyllaceae

American Journal of Botany, EarlyView.
Abstract Premise The identity of sterile floral organs in second‐whorl, alternisepalous positions within Caryophyllaceae remains contentious, having been described as staminodes, “petaloids,” or petals homologous with those of other Pentapetalae. Limited ingroup and outgroup sampling and floral developmental data and inadequate phylogenetic comparative
Riley J. Rees, Andrea D. Appleton, John J. Schenk   +2 more
wiley   +1 more source

Scale-Dependent Semantic Dynamics Revealed by Allan Deviation

CoRR
While language progresses through a sequence of semantic states, the underlying dynamics of this progression remain elusive. Here, we treat the semantic progression of written text as a stochastic trajectory in a high-dimensional state space. We utilize Allan deviation, a tool from precision metrology, to analyze the stability of meaning by treating ...
openaire   +2 more sources

Assessment of Noise of MEMS IMU Sensors of Different Grades for GNSS/IMU Navigation

Sensors
Inertial measurement units (IMUs) are key components of various applications including navigation, robotics, aerospace, and automotive systems. IMU sensor characteristics have a significant impact on the accuracy and reliability of these applications. In
Vladimir Suvorkin, Miquel Garcia-Fernandez, Guillermo González-Casado, Mowen Li, Adria Rovira-Garcia   +4 more
doaj   +1 more source

Quartz Enhanced Photoacoustic Spectroscopy Based on a Custom Quartz Tuning Fork

Sensors, 2019
We have designed and fabricated a custom quartz tuning fork (QTF) with a reduced fundamental frequency; a larger gap between the prongs; and the best quality factor in air at atmospheric conditions ever reported, to our knowledge.
Maxime Duquesnoy, Guillaume Aoust, Jean-Michel Melkonian, Raphaël Lévy, Myriam Raybaut, Antoine Godard   +5 more
doaj   +1 more source

Systemic Bevacizumab for Severe Bleeding From Acquired Gastrointestinal Vascular Malformations

American Journal of Hematology, EarlyView.
Targeted antiangiogenic therapy with systemic bevacizumab for bleeding from acquired GI VMs was found to be safe and effective for chronic and severe bleeding from acquired vascular malformations due to idiopathic angiodysplasia, chronic liver disease, and deficiencies of von Willebrand factor, in a patient population comprised mostly of heavily ...
Nardeen E. Ayad, Jacob R. Anderson, Bimalangshu Dey, Rebecca Karp Leaf, Andrew B. Song, Hanny Al‐Samkari   +5 more
wiley   +1 more source

Coherent population trapping with a controlled dissipation: applications in optical metrology

New Journal of Physics, 2018
We analyze the properties of a pulsed coherent population trapping protocol that uses a controlled decay from the excited state in a Λ-level scheme. We study this problem analytically and numerically and find regimes where narrow transmission, absorption,
L Nicolas, T Delord, P Jamonneau, R Coto, J Maze, V Jacques, G Hétet   +6 more
doaj   +1 more source

Hyperacute Interleukin‐1β Production and Neutrophil Extracellular Trap Formation in the Cerebral Circulation of Stroke Patients with Large Vessel Occlusion

Annals of Neurology, EarlyView.
Acute ischemic stroke due to large vessel occlusion is associated with rapid intravascular immune activation. Analysis of arterial blood sampled distal to the thrombus during mechanical thrombectomy revealed increased extracellular adenosine triphosphate (ATP) and interleukin‐1β (IL‐1β) levels, evidence of inflammasome priming in monocytes, and ...
Justine Münsterberg, Caspar Brekenfeld, Hanna Englert, Marius Piepke, Regine J. Dress, Martin Oertel, Tina Fischer, Romy Hackbusch, Mingming Zha, Haodi Cai, Christian Casar, Ines S. Schädlich, Leo Winter, Alina Jander, Karoline Degenhardt, Maxim Bester, Fabian Flottmann, Uta Hanning, Brigitte Holst, Anna Worthman, Johanna Hiefner, Berenike Rutz, Eckhard Schlemm, Götz Thomalla, Bettina H. Clausen, Ann M. Stowe, Immo Prinz, Thiruma V. Arumugam, Markus Glatzel, Thomas Renné, Jens Fiehler, Eva Tolosa, Tim Magnus, Mathias Gelderblom   +33 more
wiley   +1 more source

Direct digitalized phase comparison between signals with different nominal frequencies

AIP Advances, 2019
In this paper, the direct digitalized phase comparison which has phase continuous and high resolution is proposed to measure the phase variation of the high-precision frequency standard with different nominal frequencies. During the least common multiple
Zhiqi Li, Chenyuan Xue, Wei Zhou, Xiaolong Chen, Ning Yang   +4 more
doaj   +1 more source

Trace gas sensing based on multi-quartz-enhanced photothermal spectroscopy

Photoacoustics, 2020
A multi-quartz-enhanced photothermal spectroscopy (M-QEPTS) based trace gas detection method is reported for the first time. Different from traditional QEPTS sensor employing a single quartz tuning fork (QTF) as a photothermal detector, two QTFs were ...
Yufei Ma, Yinqiu Hu, Shunda Qiao, Ying He, Frank K. Tittel   +4 more
doaj   +1 more source