Formation Of The Helium Pores Of Different Shape And Their Stability At High Superequilibrium Pressures In Neutron Irradiated Boron Carbide PDF Download

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Helium Bubbles in Irradiated Boron Carbide. [Neutron Irradiation Between 540° and 2000°C].

Helium Bubbles in Irradiated Boron Carbide. [Neutron Irradiation Between 540° and 2000°C].
Author:
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Total Pages:
Release: 1979
Genre:
ISBN:

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Boron carbide, in nuclear reactor neutron absorber applications, generates large quantities of helium, some of which is trapped in small bubbles within the grains. Transmission electron microscopy was used to examine the size distribution, shape and density of these bubbles in boron carbide irraidated to temperatures between 540°C and 2000°C to burnups between 27 and 62 x 102° captures/cm3.


Modeling of Helium Bubble Nucleation and Growth in Neutron Irradiated RAFM Steels

Modeling of Helium Bubble Nucleation and Growth in Neutron Irradiated RAFM Steels
Author: Christian Dethloff
Publisher: KIT Scientific Publishing
Total Pages: 194
Release: 2014-05-22
Genre: Science
ISBN: 3866449011

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Reduced Activation Ferritic/Martensitic (RAFM) steels are first candidate structural materials in future fusion technology. In this work a physically based model using Rate Theory is developed to describe nucleation and growth of helium bubbles in neutron irradiated RAFM steels. Several modifications of the basic diffusion limited model are presented allowing a comprehensive view of clustering effects and their influence on expected helium bubble size distributions.


Helium Generation and Diffusion in Graphite and Some Carbides. [14. 9 and 14. 4 MeV Neutrons].

Helium Generation and Diffusion in Graphite and Some Carbides. [14. 9 and 14. 4 MeV Neutrons].
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Release: 1976
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ISBN:

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The cross section for the generation of helium in neutron irradiated carbon was found to be 654 mb at 14.4 MeV and 744 mb at 14.9 MeV. Extrapolating to 14.1 MeV (the fusion reactor spectrum) gives 615 mb. The diffusion of helium in dense polycrystalline graphite and in pyrographite was measured and found to be D = 7.2 x 10−7 m2s−1 exp ( -80 kJ/RT). It is assumed that diffusion is primarily in the basal plane direction in crystals of the graphite. In polycrystalline graphite the path length is a factor of .sqrt. 2 longer than the measured distance due to the random orientation mismatch between successive grains. Isochronal anneals (measured helium release as the specimen is steadily heated) were run and maximum release rates were found at 200°C in polycrystalline graphite, 1000°C in pyrographite, 1350°C in boron carbide, and 1350° and 2400°C (two peaks) in silicon carbide. It is concluded that in these candidates for curtain materials in fusion reactors the helium releases can probably occur without bubble formation in graphites, may occur in boron carbide, but will probably cause bubble formation in silicon carbide. 7 figures.


Physically Based Model for Helium Release from Irradiated Boron Carbide

Physically Based Model for Helium Release from Irradiated Boron Carbide
Author:
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Total Pages:
Release: 1979
Genre:
ISBN:

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The model is based on the nucleation of nonequilibrium helium bubbles under high pressures. The bubbles subsequently act as traps and grow as the result of gas atom diffusion. Model predictions are compared with bubble densities, sizes, and helium release characteristics of irradiated boron carbide.


Cross-Strait Relations Since 2016

Cross-Strait Relations Since 2016
Author: J. Michael Cole
Publisher: Routledge
Total Pages: 0
Release: 2020-02-20
Genre: Political Science
ISBN: 9781000029284

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Cross-Strait Relations Since 2016: The End of the Illusion examines the situation in the Taiwan Strait since the election of Tsai Ing-wen of the Democratic Progressive Party in the January 2016 general elections. Tracking the pragmatic approach taken by the Tsai administration, this book positions the recent developments within a changing geopolitical context and analyzes Beijing’s reactions to an environment which has become increasingly skeptical of its intentions. It shows that despite President Tsai’s commitment to the "status quo" in the Taiwan Strait and pro-democracy policies, which have been well received by the international community, Xi Jinping continues to advocate for a unification policy which remains very unpopular in Taiwan. With in-depth, on-the-ground analysis based on access to various government actors in Taiwan and abroad, the author takes a deep dive into a highly complex relationship that is often misunderstood abroad, with stakes that have direct implications for the future stability of the Indo-Pacific region. The first English language book to provide a full assessment of the four years of DPP rule since 2016, this book will be useful to students and scholars of Asian Studies and Taiwan Studies, as well as Security Studies, Politics and International Relations.