共查询到20条相似文献,搜索用时 10 毫秒
1.
N. N. Andrianova A. M. Borisov 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2008,2(2):189-192
The results of analytical estimations and computer simulation of a radiation damage level dpa are presented and discussed taking into account the material sputtering under ion bombardment. It is shown that the calculations of a stationary level of radiation damage are necessary for the interpretation of regularities of a radiation damage in materials under high fluence ion bombardment. 相似文献
2.
N. N. Andrianova S. Y. Betsofen A. M. Borisov Yu. S. Virgilyev E. S. Mashkova E. A. Pitirimova N. L. Semenova 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2010,4(3):502-506
The influence of radiation damage on the microstructure of pyrolytic graphites was analyzed. The correlation between the temperature
dependences of ion-induced electron emission and structural modification of UPV-1 pyrolytic graphite and highly oriented UPV-1T
pyrolytic graphite under neutron and high-fluence (1017–1019 cm−2) (30 keV) Ar+ irradiation was experimentally studied and discussed. 相似文献
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4.
E. G. Sheikin 《Technical Physics》2000,45(8):1019-1024
Parameters of the model atomic interaction potential are suggested to be determined by comparing the experimental and analytical values of projective ion ranges. The parameters were found for the interaction of Bi, Pb, Au, Yb, Er, Eu, Cs, Xe, Sn, Rb, Kr, Ga, and Cu ions with carbon and boron atoms. 相似文献
5.
V. I. Yukalov 《Hyperfine Interactions》1990,56(1-4):1657-1659
We calculate the dependence of the Mössbauer-effect probability on the concentration of the amorphised phase in irradiatede materials. The calculated dependence is compared with experimental data for ferrite-garnets irradiated by fast neutrons. A nice agreement has been found between the theory and the experimental results. 相似文献
6.
利用有源传输线模型与漂移-扩散模型的耦合计算模型,对在瞬态X射线辐照下电缆末端典型N+-p-n-N+结构的双极晶体管负载的毁伤效应与规律进行研究,通过分析双极晶体管内部晶格温度分布,判定是否处于毁伤状态,总结双极晶体管烧毁时间和烧毁所需能量与脉冲X射线脉冲宽度和注量之间的关系。结果表明:随着脉冲X射线脉宽增加,双极晶体管烧毁能量变化较小,烧毁时间逐渐增加;随着注量增加,烧毁时间逐渐降低,在5.86J/cm2以下时,烧毁所需能量基本相同,之后呈指数逐渐增加,并通过曲线拟合得到损伤规律的经验公式。 相似文献
7.
利用有源传输线模型与漂移-扩散模型的耦合计算模型,对在瞬态X射线辐照下电缆末端典型N+-p-n-N+结构的双极晶体管负载的毁伤效应与规律进行研究,通过分析双极晶体管内部晶格温度分布,判定是否处于毁伤状态,总结双极晶体管烧毁时间和烧毁所需能量与脉冲X射线脉冲宽度和注量之间的关系。结果表明:随着脉冲X射线脉宽增加,双极晶体管烧毁能量变化较小,烧毁时间逐渐增加;随着注量增加,烧毁时间逐渐降低,在5.86 J/cm2以下时,烧毁所需能量基本相同,之后呈指数逐渐增加,并通过曲线拟合得到损伤规律的经验公式。 相似文献
8.
A.V. Shavlov 《Physics letters. A》2009,373(43):3959-3964
The analyzed subject is a model of a fireball on the basis of two-temperature plasma. It is hereby recommended to use the offered criteria of plasma confinement and its balance with the environment - atmosphere. You can also see the numerical fit of calculated parameters of internal energy, life time, and surface tension with the analogous parameters of a typical natural fireball. 相似文献
9.
A. Seeger 《辐射效应与固体损伤》2013,168(3):165-173
The paper shows that the conclusions drawn from recent experiments on electron irradiation of gold at about 100° K should be reversed, i.e. that these experiments speak against the free thermally activated migration of interstitials at the irradiation temperature. It is shown that this viewpoint is in agreement with several related experiments, which may all be interpreted by a dynamic propagation of crowdions over distances between 1000 Å and 2000 Å. At intermediate and high defect concentrations the dynamic propagation mechanism is suppressed. 相似文献
10.
A. L. M. Davies 《辐射效应与固体损伤》2013,168(1):9-14
235U fission fragment and fast neutron irradiations induce, at 30 K, an important increase in the electrical resistivity of a-Fe80B20 and a-Fe78Mo2B20. This increase anneals out partially when the samples are heated up to 300 K in two stages. An interpretation in terms of structural defects in the short range order of the amorphous alloys is presented. 相似文献
11.
Characteristic parameters of diffusive supersonic radiation transport in low density materials 下载免费PDF全文
Diffusive heat waves play an important role in radiation
hydrodynamics. In low density material, it may be possible that the
radiative energy flux dominates the material energy flux and thus
energy flow can be determined. In this paper by means of a simple
algebraic method, the expressions characterizing the condition of
diffusion approximation and supersonic transport of heat wave are
found. In this case, the ratio of the radiative energy flux to the
material energy flux is directly proportional to the product of Mach
number M multiplied by optical depth \tau. And it may also be
expressed by radiation temperature heating material. The material
density and length may be determined in order to achieve
above-mentioned conditions when the driven temperature and duration
are given. 相似文献
12.
I. Kh. Abdukadyrova 《Journal of Applied Spectroscopy》2008,75(3):374-378
The influence of radiation damage on a number of lattice vibration parameters in two SiO2 modifications was investigated using IR reflectance spectroscopy. The radiation kinetics of changes in spectral characteristics
of SiO2 fundamental vibrations in crystalline and glassy states were determined. The reflectivity coefficient and the frequency of
degenerate vibrations as functions of dose showed minima, the locations of which were governed by the type of sample. At high
neutron irradiation doses (1021 cm−2), certain characteristics of the bands had the same values for both modified materials. Features of the radiation kinetics
of sample dynamic parameters were determined. It was deduced that the specific character of the observed radiation-induced
changes in spectral and dynamic parameters of vibrations near degenerate modes was due to both the accumulation of radiation
damage and a change in the force field surrounding bridging bonds, which is related to a change in the SiO2 structure.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 75, No. 3, pp. 354–358, May–June, 2008. 相似文献
13.
Different SiGe processes and device designs are the critical influences of ionizing radiation damage. Based on the different ionizing radiation damage in SiGe HBTs fabricated by Huajie and an IBM SiGe process, quantitatively numerical simulation of ionizing radiation damage was carried out to explicate the distribution of radiation-induced charges buildup in KT9041 and IBM SiGe HBTs. The sensitive areas of the EB-spacer and isolation oxide of KT9041 are much larger than those of the IBM SiGe HBT, and the distribution of charge buildup in KT9041 is several orders of magnitude greater than that of the IBM SiGe HBT. The result suggests that the simulations are consistent with the experiment, and indicates that the geometry of the EB-spacer, the area of the Si/SiO_2 interface and the isolation structure could be contributing to the different ionizing radiation damage. 相似文献
14.
钨是最具应用前景的面向等离子体候选材料,但核聚变堆内强烈的辐照环境会使钨的近表面区域产生辐照损伤,进而影响其关键的导热性能.本文构建了包含辐照损伤相关缺陷的晶体钨模型,并采用非平衡分子动力学的方法定量研究了这些缺陷对钨导热性能的影响.结果表明,随中子辐射能量的增加,晶体内部留下的Frenkel缺陷数目增多进而导致钨的晶格热导率降低;间隙原子比空位更易于向晶界偏聚,且钨中的间隙钨原子与空位相比,使晶格热导率下降程度更大.纳米级氦气泡导致晶格热导率的显著降低,气孔率为2.1%时晶格热导率降至完美晶体的约25%.这些不同的缺陷造成不同程度的周围晶格扭曲,增加了声子散射几率,是导致晶格热导率下降的根源. 相似文献
15.
The boundary conditions of a vibrating plate are known to have an influence on its sound radiation for frequencies below the critical frequency. To investigate this effect in a systematic way, the average radiation efficiency and radiated power are calculated for a rectangular plate set in an infinite baffle using a modal summation approach. Whereas analytical expressions exist for simply supported boundary conditions, a numerical approach is required for other cases. Nine combinations of boundary conditions are considered, consisting of simply supported, clamped and free edges on different plate edges. The structural vibration is approximated by using independent beam functions in orthogonal directions allowing simple approximate formulae for mode shapes and natural frequencies. This assumption is checked against a finite element model and shown to give reliable results. It is shown that a free plate has the lowest radiation efficiency and a clamped plate the highest for most frequencies between the fundamental panel natural frequency and the critical frequency. Other combinations of boundary condition give intermediate results according to the level of constraint introduced. The differences depend on frequency: excluding the extreme case of a fully free plate all the other boundary conditions give results within a range of 8 dB in the middle part of the short-circuiting region, decreasing towards the critical frequency. At low frequency the differences can be even greater, in some cases up to 20 dB. These conclusions are shown to hold for a range of plate thicknesses and dimensions. 相似文献
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The influence of damage induced by 2 MeV protons on CdZnTe radiation detectors is investigated using ion beam induced charge (IBIC) microscopy. Charge collection efficiency (CCE) in irradiated region is found to be degraded above a fluence of 3.3 × 1011 p/cm2 and the energy spectrum is severely deteriorated with increasing fluence. Moreover, CCE maps obtained under the applied biases from 50 V to 400 V suggests that local radiation damage results in significant degradation of CCE uniformity, especially under low bias, i. e., 50 V and 100 V. The CCE nonuniformity induced by local radiation damage, however, can be greatly improved by increasing the detector applied bias. This bias-dependent effect of 2 MeV proton-induced radiation damage in CdZnTe detectors is attributed to the interaction of electron cloud and radiation-induced displacement defects. 相似文献
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E. Surdutovich A. V. Yakubovich A. V. Solov’yov 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2010,60(1):101-108
We present the latest advances of the multiscale approach to
radiation damage caused by
irradiation of a tissue with energetic ions and report
the calculations of complex DNA damage and the
effects of thermal spikes on biomolecules. The
multiscale approach aims to
quantify the most important physical, chemical, and biological
phenomena taking place during and following irradiation with ions
and provide a better means for clinically-necessary calculations
with adequate accuracy.
We suggest a way of quantifying the complex clustered damage, one of
the most important features of the radiation damage caused by
ions. This quantification allows the studying of how the clusterization
of DNA lesions affects the lethality of damage.
We discuss the first results of molecular dynamics
simulations of ubiquitin in the environment of
thermal spikes, predicted to occur in tissue for a short time after
an ion’s passage in the vicinity of the ions’ tracks. 相似文献
20.
W. Schilling 《Hyperfine Interactions》1978,4(1-2):636-644