Microstructural modifications in ion-irradiated nuclear materials: characteristic features of fluorite-structured oxides

2010 ◽  
Vol 1265 ◽  
Author(s):  
Aurelien Debelle ◽  
Frederico Garrido ◽  
Lionel Thome
Keyword(s):  
Energy Range ◽  
Radiation Defect ◽  
Elastic Strain ◽  
Nuclear Materials ◽  
Ion Energy ◽  
Cubic Zirconia ◽  
One Step ◽  
Characteristic Features

AbstractThe behavior of two nuclear materials, namely cubic zirconia and urania, is investigated under different irradiation conditions in the low and medium ion energy range (tens of keV to a few MeV). In each case, these materials display a multi-step damage build-up, as revealed by both RBS/C and XRD measurements. It is demonstrated that each step exhibits characteristic features such as damage fraction, elastic strain, nature of defects, and thus presents a specific microstructure. The transition from one step to the following involves radiation defect re-organization which arises to lower the energy of the system.

Direct ion beam deposition of carbon films on silicon in the ion energy range of 15–500 eV

1991 ◽  
Vol 70 (10) ◽  
pp. 5623-5628 ◽  
Author(s):  
W. M. Lau ◽  
I. Bello ◽  
X. Feng ◽  
L. J. Huang ◽  
Qin Fuguang ◽  
...  
Keyword(s):  
Energy Range ◽  
Ion Beam ◽  
Carbon Films ◽  
Ion Energy ◽  
Ion Beam Deposition ◽  
Beam Deposition

Magnetospheric Multiscale (MMS) Observations of ULF Waves and Correlated Low-Energy IonMonoenergetic Acceleration

2020 ◽  
Author(s):  
Bin Li
Keyword(s):  
Energy Range ◽  
Total Energy ◽  
Minimum Energy ◽  
Low Energy ◽  
Ulf Waves ◽  
Ion Energy ◽  
Magnetospheric Multiscale ◽  
Terrestrial Magnetosphere ◽  
Plasma Investigation ◽  
Positively Charged

<div>Low‐energy ions of ionospheric origin with energies below 10s of electron volt dominate most</div><div>of the volume and mass of the terrestrial magnetosphere. However, sunlit spacecraft often become</div><div>positively charged to several 10s of volts, which prevents low‐energy ions from reaching the particle</div><div>detectors on the spacecraft. Magnetospheric Multiscale spacecraft (MMS) observations show that</div><div>ultralow‐frequency (ULF) waves drive low‐energy ions to drift in the E × B direction with a drift velocity</div><div>equal to VE×B, and low‐energy ions were accelerated to suffificient total energy to be measured by the</div><div>MMS/Fast Plasma Investigation Dual Ion Spectrometers. The maximum low‐energy ion energy flflux peak</div><div>seen in MMS1's dual ion spectrometer measurements agreed well with the theoretical calculation of H+ ion</div><div>E × B drift energy. The density of ions in the energy range below minimum energy threshold was</div><div>between 1 and 3 cm−3 in the magnetosphere subsolar region in this event.</div>

Atomic Charge State Ratios of 6Li Ions from 5.8–16.4 MeV

1971 ◽  
Vol 49 (4) ◽  
pp. 480-482 ◽  
Author(s):  
H. Stocker ◽  
E. H. Berkowitz
Keyword(s):  
Energy Range ◽  
Charge State ◽  
Atomic Charge ◽  
Ion Energy ◽  
Equilibrium Charge ◽  
Thin Carbon ◽  
Measured Ratio ◽  
Ion Velocity ◽  
Carbon Foils

The ratio, F2∞/F3∞, of equilibrium charge state fractions has been measured for 6Li2+,3+ ions in thin carbon foils and found to vary from 14%–1% over the ion energy range from 5.87–16.45 MeV. The measured ratio varies inversely with the fifth power of the ion velocity.

Virus-Like Particles With FLAG-Tagged Envelope Protein as A Tetravalent Dengue Vaccine Candidate

2021 ◽  
Author(s):  
Toshifumi Imagawa ◽  
Masahiko Ito ◽  
Mami Matsuda ◽  
Kenji Nakashima ◽  
Yuhei Tokunaga ◽  
...  
Keyword(s):  
Dengue Virus ◽  
Mammalian Cells ◽  
Vaccine Development ◽  
Secondary Infection ◽  
Denv Infection ◽  
Vaccine Platform ◽  
Virus Like Particles ◽  
Denv Serotypes ◽  
One Step ◽  
Characteristic Features

Abstract The global incidence of dengue, which is caused by dengue virus (DENV) infection, has grown dramatically in recent decades and secondary infection with heterologous serotype of the virus may cause severe symptoms. Efficacious dengue vaccines should be able to provide long-lasting immunity against all four DENV serotypes simultaneously. In this study, we constructed a novel vaccine platform based on tetravalent dengue virus-like particles (DENV-LPs) in which envelope (E) protein carried a FLAG tag sequence at the position located not only in the exterior loop on the protruding domain but outside of dimerization interface of the protein. We demonstrated an effective strategy to produce the DENV-LPs by transient transfection with expression plasmids for pre-membrane and E proteins of DENV-1 to DENV-4 in mammalian cells and to concentrate and purify them with one-step affinity chromatography. Characteristic features of VLPs such as particle size, shape and density were comparable to flavivirus-like particles reported. The neutralizing activity against all four DENV serotypes was successfully induced by immunization with the purified tetravalent VLPs in mice. Simple, one-step purification systems for VLP vaccine platforms using epitope-tagging strategy should be advantageous for vaccine development not only for dengue but for emerging pandemics in the future.

Characteristic features of EAS in the energy range of 50–500 PeV by the Yakutsk data

1997 ◽  
Vol 52 (3) ◽  
pp. 194
Author(s):  
B.N. Afanasiev ◽  
S.P. Knurenko ◽  
V.A. Kolosov ◽  
I.T. Makarov ◽  
S.I. Nikolsky ◽  
...  
Keyword(s):  
Energy Range ◽  
Characteristic Features

Energy dependence of ion-molecule reactions. II. Methyl chloride

1969 ◽  
Vol 22 (11) ◽  
pp. 2275 ◽  
Author(s):  
NA McAskill
Keyword(s):  
Energy Range ◽  
Gas Phase ◽  
Energy Dependence ◽  
Mass Spectrometer ◽  
Rate Constant ◽  
Methyl Chloride ◽  
Negative Ion ◽  
Polar Molecules ◽  
Ion Energy ◽  
Ion Molecule Reactions

The ion-molecule reactions of ions in methyl chloride were studied in the gas phase at source pressures of up to 120 μ in a mass spectrometer using ions having exit energies which ranged from 0.2 to 2.0 eV. The ions produced by secondary processes included CH4Cl+, CH2Cl+, and C2H6Cl+. The rate constant for the reaction of CH3Cl+ was found to be independent of the ion energy in the energy range studied. A theoretical rate constant which is independent of the ion energy was also derived for reactions between ions and polar molecules. Negative ion spectra were briefly examined.

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