Results 41 to 50 of about 34,325 (227)

Damage studies on irradiated tungsten by helium ions in a plasma focus device

Nuclear Engineering and Technology, 2020
Damage of tungsten due to helium ions of a PF device was studied. The tungsten was analyzed by SEM and AFM after irradiation. SEM revealed fine bubbles of helium atoms with diameters of a few nanometers, which join and form larger bubbles and blisters on
Mir mohammadreza Seyyedhabashy, Mohammad Amirhamzeh Tafreshi, Babak Shirani bidabadi, Sepideh Shafiei, Ali Nasiri   +4 more
doaj   +1 more source

Near-surface fragmentation in irradiated copper under two successive shock loading: effects of local temperature re-distribution and helium bubble expansion

Materials & Design
The underlying physical mechanisms of metal materials associated with the effects of helium bubbles on surface damage under complex shock loading remain mysterious, primarily due to the challenges of observing dynamic evolution in situ and in real time ...
Qiang Bao, Haonan Sui, Bao Wu, Xin-Xin Wang, Qi Zhu, Jian-Li Shao, An-Min He, Pei Wang   +7 more
doaj   +1 more source

Exploring the impact of pre-existing helium bubbles on nanoindentation in tungsten through molecular dynamics simulation

Journal of Materials Research and Technology
Gaining insight into the underlying mechanisms driving nanoindentation-induced behavior in tungsten is essential for comprehending its mechanical properties.
Pan-dong Lin, Jun-feng Nie, Shu-gang Cui, Wen-dong Cui, Lei He, Gui-yong Xiao, Yu-peng Lu   +6 more
doaj   +1 more source

Kinetics of helium bubble formation in nuclear materials

, 2005
The formation and growth of helium bubbles due to self-irradiation in plutonium has been modelled by a discrete kinetic equations for the number densities of bubbles having $k$ atoms.
A. Carpio, J.C. Neu, King, L.L. Bonilla, McKendrick, Neu, Schwartz, W.G. Wolfer   +7 more
core   +2 more sources

Time-evolution of ionization and heating around first stars and miniquasars [PDF]

, 2008
A one dimensional radiative transfer code is developed to track the ionization and heating pattern around the first miniquasars and Population III stars.
Abel, Aghanim, Allison, Barkana, Begelman, Benson, Bharadwaj, Bromm, Carilli, Chuzhoy, Ciardi, Ciardi, Dijkstra, Dijkstra, Dopita, Elvis, Fan, Fan, Field, Fukugita, Furlanetto, Furlanetto, Furlanetto, Hogan, Iliev, Iliev, Iliev, Jones, Kitayama, Kuhlen, Kuhlen, Laor, Liszt, Madau, Madau, Mellema, Nusser, Press, Rajat M. Thomas, Rhook, Ricotti, Ricotti, Saleem Zaroubi, Sazonov, Schaerer, Scott, Shapiro, Shaver, Shull, Smith, Spaans, Spergel, Sunyaev, Sunyaev, Sunyaev, Tozzi, Vanden Berk, Verner, Vignali, Volonteri, Whalen, Wouthuysen, Wyithe, Wyithe, Wyithe, Zaldarriaga, Zaroubi, Zaroubi, Ze'ldovich, Zygelman   +69 more
core   +2 more sources

Influence of exposure conditions on helium transport and bubble growth in tungsten

Scientific Reports, 2021
Helium diffusion, clustering and bubble nucleation and growth is modelled using the finite element method. The existing model from Faney et al. (Model Simul Mater Sci Eng 22:065010, 2018; Nucl Fusion 55:013014, 2015) is implemented with FEniCS and ...
Rémi Delaporte-Mathurin, Mykola Ialovega, Etienne A. Hodille, Jonathan Mougenot, Yann Charles, Elodie Bernard, Céline Martin, Christian Grisolia   +7 more
doaj   +1 more source

Reducing bubbles in glass coatings improves electrical breakdown strength [PDF]

, 1968
Helium reduces bubbles in glass coatings of accelerator grids for ion thrustors. Fusing the coating in a helium atmosphere creates helium bubbles in the glass.
Banks, B.
core   +1 more source

Orbital Geometry‐Governed Response of Pressure‐Tunable Quantum Defects in hBN

Advanced Functional Materials, EarlyView.
Defects in hBN act as ultrasensitive quantum manometers when the energy of the intradefect optical transitions is modified by lattice compression. The orbital geometry of the electron wave functions governs how electron hopping and Coulomb interactions react uniquely to the reduction of the van der Waals gap and in‐plane compression, leading to robust ...
Magdalena Grzeszczyk, Danis I. Badrtdinov, Kenji Watanabe, Takashi Taniguchi, Cyrus E. Dreyer, Malte Rösner, Maciej Koperski   +6 more
wiley   +1 more source

Molecular dynamics simulation on the effect of dislocation structures on the retention and distribution of helium ions implanted into silicon

Nanotechnology and Precision Engineering, 2020
To investigate the effect of dislocation structures on the initial formation stage of helium bubbles, molecular dynamics (MD) simulations were used in this study. The retention rate and distribution of helium ions with 2 keV energy implanted into silicon
Li Ji, Lei Liu, Zongwei Xu, Ying Song, Jintong Wu, Rongrong Li, Fengzhou Fang   +6 more
doaj   +1 more source

Formation of Bubble-Loop Complexes During Helium Radiation in Fe-9Cr Steel

Frontiers in Energy Research, 2021
In the present study, the Fe-9Cr model alloy was irradiated with 240 keV He2+ at 550°C with a dose of 0.5 dpa at the peak damage region. The depth distribution of bubbles in Fe-9Cr alloy was investigated by transmission electron microscopy (TEM).
Tiantian Shi, Wenbo Liu, Zhengxiong Su, Xu Yan, Chenyang Lu, Zhaoxi Yang, Xinfu He, Wei Yan, Di Yun, Di Yun   +9 more
doaj   +1 more source