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排序方式: 共有275条查询结果,搜索用时 15 毫秒
191.
Fragmentation testing of thin films on substrates has in the past been mostly performed in situ using optical and scanning electron microscopy. While these techniques work well for brittle materials, they cannot always discern the difference between through-thickness cracks (TTCs) and localized plastic deformation of ductile films. Here, we describe fragmentation testing with atomic force microscopy and present criterion to distinguish TTCs and localized deformation for ductile films. 相似文献
192.
Hiroyuki Hosokawa Koji Shimojima Hajime Iwasaki Mamoru Mabuchi 《Philosophical Magazine Letters》2013,93(11):713-718
Nanocrystalline and sub-microcrystalline samples of nickel have been machined by a focused Ga+ ion beam (30?keV and 187?pA) at doses of 8.92?×?1016?–?2.68?×?1018 ions/cm2 and their surface topography was investigated by atomic force microscopy (AFM). Values of the root-mean-square (RMS) roughness increase with increasing ion dose. The surfaces of the nanocrystalline Ni were smoother than those of the sub-microcrystalline Ni, indicating that smoothing due to diffusion for the former works more effectively than that for the latter. 相似文献
193.
194.
Miao-Gen Chen Sen-Jiang Yu Zhi-Wei Jiao Ming-Zhou Yu Fu-Bing Bao 《Philosophical Magazine Letters》2013,93(3):122-127
In this article, we report an atomic force microscopy study on the microstructure and the deposition-rate dependence of granular size distribution in copper (Cu) ramified aggregates on a liquid substrate. This study shows that the ramified Cu aggregates are composed of Gaussian size distribution granules, which form immediately after the Cu atoms are deposited. The interesting phenomenon is that the mean diameter Φm of the granules exponentially decays and approaches a stable value Φc with an increase in the deposition rate f. The granular mean diameter Φm slightly changes with the time interval Δt during which the film is kept in the vacuum chamber, owing to the large diffusion coefficient of the Cu granules on the liquid substrates. The experimental behavior strongly depends on the properties of the liquid substrate. 相似文献
195.
L. Schmirgeld-Mignot P.J.A. Molinas-Mata S. Poissonnet G. Martin 《Philosophical Magazine Letters》2013,93(1):33-40
High-temperature annealing in air of thick crystalline silver films deposited on high-purity nickel foils promotes solid-state dewetting, whereas no hole through the film is produced when annealing under high purity argon. Scanning electron microscopy observations of the film surface and of cross-sections reveal that dewetting occurs only if a nickel oxide layer forms at the silver-nickel interface, as a result of oxygen diffusion through the silver film. The main dewetting mechanism over short times (1h 1120K in air) is observed to be the condensation, at the silver-nickel oxide interface, of vacancies into voids which grow towards the free surface of the silver film. 相似文献
196.
ABSTRACTThe morphological modification of the W surface induced by specimen irradiation with 5?keV He atoms was studied at the atomic level using low-temperature ?eld ion microscope techniques. The major impact-induced damage mode on W {110} surface was found to be the formation of adatom sets produced by radiation-generated self-interstitial atoms emerging at the surface. The long-range interaction was revealed by evaluating the experimental probability density of finding two radiation-generated adatoms at a given separation in comparison with the probability density corresponding to a random distribution of adatoms. The statistically significant difference of these distributions consists of the absence or severe reduction of observed adatom pairs with separations in the range 5–11?Å. The experimental distribution was characterised by a relatively open arrangement of adatoms with the closest separation of about 11?Å. Our field ion microscope observations also reveal the self-organisation of radiation-generated W adatoms into atomic chains with the lateral interatomic separation substantially larger than the nearest-neighbor distance. These effects indicate the existence of long-range interactions between radiation-generated adatoms and radiation-generated self-interstitial atoms in the subsurface region. 相似文献
197.
Shin Inamoto Jun Yamasaki Hirokazu Tamaki Nobuo Tanaka 《Philosophical Magazine Letters》2013,93(9):632-639
The atomistic structure of the 3C-SiC/Si(001) interface has been investigated using a combination of aberration-corrected transmission electron microscopy and a newly developed image processing method for eliminating artificial contrast. The structures having periods four times longer than those of the silicon lattice have been observed distinctly in images taken along both Si[110] and Si[100] directions. Contrary to theoretical models proposed previously, the interface of the three-dimensional structural model that we constructed on the basis of our experiments has a silicon-rich configuration. We have clarified that the strain field induced by the two-dimensional misfit between Si(001)-(4?×?4) and SiC(001)-(5?×?5) is relaxed by the two-dimensional network of misfit dislocations; simple edge dislocations with [100] and [010] directions and Lomer dislocations with [110] and [110] directions. The atomistic structures of the Lomer dislocations have been also clarified. 相似文献
198.
199.
Lothar Schfer 《Zygon》2006,41(3):583-592
Abstract. I respond to Carl Helrich's criticism of my proposition that the emergence of complex order in the universe is from Virtual State Actualization (VSA). The question is discussed as to whether quantum theory is able to afford any kind of quantum ontology or whether it merely allows an epistemological view. I point out that, even though many contradictory interpretations of quantum theory are currently possible, the concept of VSA is based on molecular properties that are so simple and factual that they are beyond interpretation. Helrich's appeal for caution in proceeding from physical reality to Divine Reality is wholeheartedly supported and a detailed discussion is given. 相似文献
200.
Danut Gailien 《The Journal of analytical psychology》2019,64(4):530-547
The research into the phenomenon of cultural trauma is growing as the effects of historical transformations are recognized and analysed. The concept of cultural trauma and the analytic concept of the cultural complex is a suitable theoretical approach for this research. The Lithuanian experience of cultural trauma after the historical shifts indicates the importance of the interplay between societal and individual factors in coping with trauma. Academic psychotraumatological studies carried out at Vilnius University indicate a stronger traumatic experience by people who are survivors of direct political repression and even intergenerational transmission of trauma, but this group also seems to demonstrate an intergenerational transmission of resilience. Paradoxically, from a long‐term perspective, the victims of direct repression seem to have suffered less than the people who accommodated to the regime, and this applies also to their offspring. Analysis in terms of overcoming cultural trauma indicates that society is gradually integrating historic traumatic experiences, although a healthy cultural identity has not yet been restored. 相似文献