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McKenna-Lawlor S.,Space Technology Ireland Ltd. | Bhardwaj A.,Vikram Sarabhai Space Center | Ferrari F.,Institute of Physics | Kuznetsov N.,SINP MSU | And 12 more authors.
Acta Astronautica | Year: 2015

An account is provided of the main sources of energetic particle radiation in interplanetary space (Galactic Cosmic Radiation and Solar Energetic Particles) and career dose limits presently utilized by NASA to mitigate against the cancer and non-cancer effects potentially incurred by astronauts due to irradiation by these components are presented. Certain gaps in knowledge that presently militate against mounting viable human exploration in deep space due to the inherent health risks are identified and recommendations made as to how these gaps might be closed within a framework of global international cooperation.


Home > Press > Prototype device for measuring graphene-based electromagnetic radiation created: Russian scientists have created a prototype device for measuring graphene-based electromagnetic radiation Abstract: Bolometer is a device for measuring electromagnetic radiation energy flow based on measurement of variations of physical parameters of thermosensitive element as a result of heating by absorption of radiation energy. "We studied thermal and optical properties of the carbon structures derived from the reduced graphene oxide in a wide range of wavelengths from visible to infrared. In addition to the optical and thermal properties of the carbon structures, we have demonstrated the bolometer prototype that operates at room temperature without additional cooling", says Stanislav Evlashin, the first author of the article, the researcher of the Skobeltsyn Institute of Nuclear Physics Lomonosov Moscow State University (SINP MSU), PhD in Physico-Mathematical Sciences. Synthesis and investigations of the new materials for bolometric sensors have a great scientific and practical importance. Such materials should possess a high effective absorption over a wide spectral range, high stable thermoresistive effect (change in electrical conductance with temperature), and, of course, they must be cheap to manufacture. To create bolometer prototype the water solution of graphene oxide was used, which was obtained by the standard method of graphite oxidation, which is known and widely used. The resulting suspension of graphene oxide was deposited on the substrate for subsequent laser microstructuring. Laser treatment causes partial reduction of graphene oxide film and changes morphology, consequently, it changes optical and thermal properties of graphene oxide. The material synthesis and development of the bolometer prototype was held at SINP MSU. Studies on the optical properties were carried out at Physics Department of Moscow State University. Research on the thermal properties were carried out at LPI RAS. "Laser microstructuring of graphene oxide opens up the possibility of selective creation of antireflective, thermally-conductive and electrically-conductive coatings. Developed method is quite cheap, compatible with conventional semiconductor technology and allows you to create antiabsorbing coatings that would cover large areas on almost any surface. The observed properties of reduced graphene oxide partially show the prospects of it's use in bolometric matrices and other IR devices," - says Stanislav Evlashin. For more information, please click If you have a comment, please us. Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.


News Article | October 28, 2016
Site: www.cemag.us

A prototype device called a bolometer measures electromagnetic radiation energy flow based on physical parameter variations of thermosensitive elements as a result of heating by absorption of radiation energy. "We studied thermal and optical properties of the carbon structures derived from reduced graphene oxide in a wide range of wavelengths from visible to infrared. In addition to the optical and thermal properties of the carbon structures, we have demonstrated the bolometer prototype that operates at room temperature without additional cooling," says Stanislav Evlashin, the first author of the article, the researcher of the Skobeltsyn Institute of Nuclear Physics Lomonosov Moscow State University (SINP MSU), PhD in Physico-Mathematical Sciences. Synthesis and investigations of the new materials for bolometric sensors have great scientific and practical importance. Such materials should possess a high effective absorption over a wide spectral range, high stable thermoresistive effect (change in electrical conductance with temperature), and they must be cheap to manufacture. To create the bolometer prototype, the researchers used a water solution of graphene oxide, which was obtained by the widely used method of graphite oxidation. The resulting suspension of graphene oxide was deposited on the substrate for subsequent laser microstructuring. Laser treatment causes the partial reduction of graphene oxide film and changes the morphology. Consequently, it changes optical and thermal properties of graphene oxide. The material synthesis for the bolometer prototype was developed at SINP MSU. Studies on the optical properties were carried out at the Physics Department of Moscow State University. Research on the thermal properties was carried out at LPI RAS. "Laser microstructuring of graphene oxide opens the possibility of selective creation of antireflective, thermally conductive and electrically conductive coatings. The method is quite cheap, compatible with conventional semiconductor technology and produces antiabsorbing coatings that would cover large areas on almost any surface. The observed properties of reduced graphene oxide partially show the prospects of its use in bolometric matrices and other IR devices," says Evlashin.


News Article | October 27, 2016
Site: www.eurekalert.org

Bolometer is a device for measuring electromagnetic radiation energy flow based on measurement of variations of physical parameters of thermosensitive element as a result of heating by absorption of radiation energy. "We studied thermal and optical properties of the carbon structures derived from the reduced graphene oxide in a wide range of wavelengths from visible to infrared. In addition to the optical and thermal properties of the carbon structures, we have demonstrated the bolometer prototype that operates at room temperature without additional cooling", says Stanislav Evlashin, the first author of the article, the researcher of the Skobeltsyn Institute of Nuclear Physics Lomonosov Moscow State University (SINP MSU), PhD in Physico-Mathematical Sciences. Synthesis and investigations of the new materials for bolometric sensors have a great scientific and practical importance. Such materials should possess a high effective absorption over a wide spectral range, high stable thermoresistive effect (change in electrical conductance with temperature), and, of course, they must be cheap to manufacture. To create bolometer prototype the water solution of graphene oxide was used, which was obtained by the standard method of graphite oxidation, which is known and widely used. The resulting suspension of graphene oxide was deposited on the substrate for subsequent laser microstructuring. Laser treatment causes partial reduction of graphene oxide film and changes morphology, consequently, it changes optical and thermal properties of graphene oxide. The material synthesis and development of the bolometer prototype was held at SINP MSU. Studies on the optical properties were carried out at Physics Department of Moscow State University. Research on the thermal properties were carried out at LPI RAS. "Laser microstructuring of graphene oxide opens up the possibility of selective creation of antireflective, thermally-conductive and electrically-conductive coatings. Developed method is quite cheap, compatible with conventional semiconductor technology and allows you to create antiabsorbing coatings that would cover large areas on almost any surface. The observed properties of reduced graphene oxide partially show the prospects of it's use in bolometric matrices and other IR devices," - says Stanislav Evlashin.


News Article | October 28, 2016
Site: phys.org

"We studied thermal and optical properties of the carbon structures derived from reduced graphene oxide in a wide range of wavelengths from visible to infrared. In addition to the optical and thermal properties of the carbon structures, we have demonstrated the bolometer prototype that operates at room temperature without additional cooling," says Stanislav Evlashin, the first author of the article, the researcher of the Skobeltsyn Institute of Nuclear Physics Lomonosov Moscow State University (SINP MSU), PhD in Physico-Mathematical Sciences. Synthesis and investigations of the new materials for bolometric sensors have great scientific and practical importance. Such materials should possess a high effective absorption over a wide spectral range, high stable thermoresistive effect (change in electrical conductance with temperature), and they must be cheap to manufacture. To create the bolometer prototype, the researchers used a water solution of graphene oxide, which was obtained by the widely used method of graphite oxidation. The resulting suspension of graphene oxide was deposited on the substrate for subsequent laser microstructuring. Laser treatment causes the partial reduction of graphene oxide film and changes the morphology. Consequently, it changes optical and thermal properties of graphene oxide. The material synthesis for the bolometer prototype was developed at SINP MSU. Studies on the optical properties were carried out at the Physics Department of Moscow State University. Research on the thermal properties was carried out at LPI RAS. "Laser microstructuring of graphene oxide opens the possibility of selective creation of antireflective, thermally conductive and electrically conductive coatings. The method is quite cheap, compatible with conventional semiconductor technology and produces antiabsorbing coatings that would cover large areas on almost any surface. The observed properties of reduced graphene oxide partially show the prospects of its use in bolometric matrices and other IR devices," says Stanislav Evlashin. Explore further: New technique integrates graphene, graphene oxide and reduced graphene oxide onto silicon chips at room temperature More information: Stanislav Evlashin et al, Controllable Laser Reduction of Graphene Oxide Films for Photoelectronic Applications, ACS Applied Materials & Interfaces (2016). DOI: 10.1021/acsami.6b10145


Ermakov A.N.,SINP MSU | Khankin V.V.,SINP MSU | Pakhomov N.I.,SINP MSU | Shvedunov V.I.,SINP MSU | And 3 more authors.
RuPAC 2012 Contributions to the Proceedings - 23rd Russian Particle Accelerator Conference | Year: 2012

Operational experience with 55 MeV pulsed race-track microtron (RTM) is reported. The upgrade of the accelerator after the commissioning and some results of the physical experiments with a beam of the RTM are presented. Copyright © 2012 by the respective authors.


Kubyshin Y.A.,University of Barcelona | Gonzalez X.,University of Barcelona | Montoro G.,University of Barcelona | Carrillo D.,CIEMAT | And 4 more authors.
IPAC 2011 - 2nd International Particle Accelerator Conference | Year: 2011

We describe the design and technical characteristics of a C-band SW accelerating structure of a 12 MeV race-track microtron, which is under construction at the Technical University of Catalonia, and its RF system with a 5712 MHz magnetron as a source. Results of cold tests of the accelerating structure, before and after the brazing, and of high-power tests of the RF system at a special stand are reported. The main features of the magnetron frequency stabilization subsystem are also outlined. Copyright © 2011 by IPAC'11/EPS-AG.


De La Fuente C.,University of Barcelona | Duch M.A.,University of Barcelona | Kubyshin Yu.,University of Barcelona | Shvedunov V.I.,SINP MSU
IPAC 2011 - 2nd International Particle Accelerator Conference | Year: 2011

The Technical University of Catalonia is building a miniature 12 MeV electron race-track microtron for medical applications. In the paper we study the leakage radiation caused by beam losses inside the accelerator head, as well as the bremsstrahlung radiation produced by the primary beam in the commissioning setting. Results of Monte Carlo simulations using the PENELOPE code are presented and two shielding schemes, global and local, are studied. The obtained shielding parameters are compared with estimates based on DIN 6847 part 2 as international recommendation of the radiation safety standards. Copyright © 2011 by IPAC'11/EPS-AG.


Karev A.I.,Russian Academy of Sciences | Lebedev A.N.,Russian Academy of Sciences | Raevsky V.G.,Russian Academy of Sciences | Lebedev P.N.,Russian Academy of Sciences | And 8 more authors.
RuPAC 2010 Contributions to the Proceedings - 22nd Russian Particle Accelerator Conference | Year: 2010

Results of Lebedev Physical Institute RAS 55 MeV special-purpose race-track microtron (RTM) commissioning are presented. RTM is intended for photonuclear detection of hidden explosives based on initiation of photonuclear activation and consequent registration of secondary gamma-rays penetrating possible screening substances.

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