Atmospheric bistatic optoelectronic communication systems: field experiments

2014 ◽  
Author(s):  
Vladimir V. Belov ◽  
Mikhail V. Tarasenkov ◽  
Vladimir N. Abramochkin
Keyword(s):  
Communication Systems ◽  
Field Experiments

Bistatic optoelectronic communication systems: Field experiments in artificial and natural water reservoirs

2017 ◽  
Vol 30 (4) ◽  
pp. 366-371 ◽  
Author(s):  
V. V. Belov ◽  
V. N. Abramochkin ◽  
Yu. V. Gridnev ◽  
A. N. Kudryavtsev ◽  
M. V. Tarasenkov ◽  
...  
Keyword(s):  
Natural Water ◽  
Communication Systems ◽  
Field Experiments ◽  
Water Reservoirs

Bistatic Underwater Optical-Electronic Communication: Field Experiments of 2017-2018

2019 ◽  
pp. 97-102
Author(s):  
Vladimir V. Belov ◽  
Vladimir N. Abramochkin ◽  
Yuri V. Gridnev ◽  
Andrei N. Kudryavtsev ◽  
Mikhail V. Tarasenkov ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Lake Water ◽  
Communication Systems ◽  
Electronic Communication ◽  
Field Experiments ◽  
Field Conditions ◽  
Valid Signal ◽  
Source Of Information

The article describes the results of experiments with underwater bistatic optoelectronic communication systems with scattered laser radiation as the source of information and the valid signal. The information reception distance of up to 40 m was gained in field conditions of lake water.

Bistatic atmospheric optoelectronic communication systems (field experiments)

2014 ◽  
Vol 40 (10) ◽  
pp. 871-874 ◽  
Author(s):  
V. V. Belov ◽  
M. V. Tarasenkov ◽  
V. N. Abramochkin
Keyword(s):  
Communication Systems ◽  
Field Experiments

scholarly journals Assisting Maritime Search and Rescue (SAR) Personnel with AI-Based Speech Recognition and Smart Direction Finding

2020 ◽  
Vol 8 (10) ◽  
pp. 818
Author(s):  
Aylin Gözalan ◽  
Ole John ◽  
Thomas Lübcke ◽  
Andreas Maier ◽  
Maximilian Reimann ◽  
...  
Keyword(s):  
Speech Recognition ◽  
Communication Systems ◽  
Field Experiments ◽  
Relevant Information ◽  
Direction Finding ◽  
Search And Rescue ◽  
Radio Communication ◽  
Very High Frequency ◽  
Domain Specific ◽  
Maritime Search And Rescue

Communication for processing relevant information plays a paramount role in developing a comprehensive understanding of Search and Rescue (SAR) situations and conducting operations in a successful and reliable manner. Nevertheless, communication systems have not changed considerably in the context of simplifying very high frequency (VHF) maritime communication and enhancing the value of SAR practices. The Automated Transcription of Maritime VHF Radio Communication for SAR Mission Coordination (ARTUS) project approaches this problem with the development of an assistance system which employs AI-based speech recognition and smart direction finding. First, ideas and specified needs of end users for designing the user interface are presented in this paper. Further, preliminary accomplishments of domain specific language training for maritime speech recognition, and the direction-finding algorithms for localizing senders are sketched out. While the preliminary results build a solid ground, additional field experiments will be conducted in order to enhance the accuracy and reliability of speech recognition and direction finding. The identified end user requirements across different personnel groups show commonalities, but call for a differentiated approach in order to meet the challenges and peculiar needs of the various working contexts.

Electron Microscopy of the Shape of Small Metal Particles

1977 ◽  
Vol 35 ◽  
pp. 300-301
Author(s):  
M. Jose Yacaman
Keyword(s):  
Electron Microscopy ◽  
Metal Particle ◽  
Field Experiments ◽  
Size Range ◽  
Dark Field ◽  
Metal Particles ◽  
Bragg Condition ◽  
Crystal Particle ◽  
Small Metal Particle ◽  
Small Metal Particles

In the Study of small metal particles the shape is a very Important parameter. Using electron microscopy Ino and Owaga(l) have studied the shape of twinned particles of gold. In that work electron diffraction and contrast (dark field) experiments were used to produce models of a crystal particle. In this work we report a method which can give direct information about the shape of an small metal particle in the amstrong- size range with high resolution. The diffraction pattern of a sample containing small metal particles contains in general several systematic and non- systematic reflections and a two-beam condition can not be used in practice. However a N-beam condition produces a reduced extinction distance. On the other hand if a beam is out of the bragg condition the effective extinction distance is even more reduced.

Plant peptide hormone signalling

2015 ◽  
Vol 58 ◽  
pp. 115-131 ◽  
Author(s):  
Ayane Motomitsu ◽  
Shinichiro Sawa ◽  
Takashi Ishida
Keyword(s):  
Communication Systems ◽  
Cell Communication ◽  
Peptide Hormone ◽  
Peptide Hormones ◽  
Target Cells ◽  
Signalling Molecules ◽  
Receptor Complexes ◽  
Environmental Responses ◽  
Plant Life Cycle ◽  
Multicellular Organisms

The ligand–receptor-based cell-to-cell communication system is one of the most important molecular bases for the establishment of complex multicellular organisms. Plants have evolved highly complex intercellular communication systems. Historical studies have identified several molecules, designated phytohormones, that function in these processes. Recent advances in molecular biological analyses have identified phytohormone receptors and signalling mediators, and have led to the discovery of numerous peptide-based signalling molecules. Subsequent analyses have revealed the involvement in and contribution of these peptides to multiple aspects of the plant life cycle, including development and environmental responses, similar to the functions of canonical phytohormones. On the basis of this knowledge, the view that these peptide hormones are pivotal regulators in plants is becoming increasingly accepted. Peptide hormones are transcribed from the genome and translated into peptides. However, these peptides generally undergo further post-translational modifications to enable them to exert their function. Peptide hormones are expressed in and secreted from specific cells or tissues. Apoplastic peptides are perceived by specialized receptors that are located at the surface of target cells. Peptide hormone–receptor complexes activate intracellular signalling through downstream molecules, including kinases and transcription factors, which then trigger cellular events. In this chapter we provide a comprehensive summary of the biological functions of peptide hormones, focusing on how they mature and the ways in which they modulate plant functions.

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