4,550 research outputs found
The observation of Extensive Air Showers from an Earth-Orbiting Satellite
In this paper we review the main issues that are relevant for the detection
of Extensive Air Showers (EAS) from space. EAS are produced by the interaction
of Ultra-High Energy Cosmic Particles (UHECP) with the atmosphere and can be
observed from an orbiting telescope by detecting air fluorescence UV light. We
define the requirements and provide the main formulas and plots needed to
design and optimize a suitable telescope. We finally estimate its expected
performances in ideal conditions.Comment: 24 pages, 10 figures; submitted to Astroparticle Physics 27 pages, 14
figures; major revision; added new figures and sections; typos fixed. arXiv
admin note: substantial text overlap with arXiv:0810.571
Alien Registration- Pesce, Ferdinand M. (Portland, Cumberland County)
https://digitalmaine.com/alien_docs/25556/thumbnail.jp
Alien Registration- Pesce, Ferdinand M. (Portland, Cumberland County)
https://digitalmaine.com/alien_docs/25556/thumbnail.jp
A Step-by-step Guide to the Realisation of Advanced Optical Tweezers
Since the pioneering work of Arthur Ashkin, optical tweezers have become an
indispensable tool for contactless manipulation of micro- and nanoparticles.
Nowadays optical tweezers are employed in a myriad of applications
demonstrating the importance of these tools. While the basic principle of
optical tweezers is the use of a strongly focused laser beam to trap and
manipulate particles, ever more complex experimental set-ups are required in
order to perform novel and challenging experiments. With this article, we
provide a detailed step- by-step guide for the construction of advanced optical
manipulation systems. First, we explain how to build a single-beam optical
tweezers on a home-made microscope and how to calibrate it. Improving on this
design, we realize a holographic optical tweezers, which can manipulate
independently multiple particles and generate more sophisticated wavefronts
such as Laguerre-Gaussian beams. Finally, we explain how to implement a speckle
optical tweezers, which permit one to employ random speckle light fields for
deterministic optical manipulation.Comment: 29 pages, 7 figure
mtDNA and mitochondrial stress signaling in human diseases: A special issue
: The completion of the Special Issue dedicated to "mtDNA and mitochondrial stress signaling in human diseases" requests a final overall look to highlight the most valuable findings among the many presented data [...]
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