High hydrogen retention in the sub-surfaces of tungsten plasma facing materials: A theoretical insight

2016 ◽  
Vol 122 ◽  
pp. 14-17 ◽  
Author(s):  
Lu Sun ◽  
Shuo Jin ◽  
Guang-Hong Lu ◽  
Ligen Wang
Keyword(s):  
High Hydrogen ◽  
Hydrogen Retention ◽  
Plasma Facing Materials ◽  
Theoretical Insight

AN IMPROVED CLUSTER DYNAMICS MODEL FOR HYDROGEN RETENTION IN TUNGSTEN

2012 ◽  
Vol 23 (06) ◽  
pp. 1250042 ◽  
Author(s):  
R. H. NING ◽  
Y. G. LI ◽  
W. H. ZHOU ◽  
Z. ZENG ◽  
X. JU
Keyword(s):  
Depth Distribution ◽  
Hydrogen Ions ◽  
Dynamics Model ◽  
Different Types ◽  
Hydrogen Retention ◽  
Plasma Facing Materials ◽  
Improved Model ◽  
Radiation Conditions ◽  
Reaction Processes ◽  
Better Than

An improved cluster dynamics model has been developed for studying the behaviors of hydrogen retention in tungsten under hydrogen ions irradiation. In addition to different types of objects, adopting up-to-date parameters and complex reaction processes, we newly introduce ion-induced and natural defects into our model. This improved model programmed in IRadMat2 could describe very well the depth distributions and the amounts of hydrogen retained in tungsten under different radiation conditions. The calculated results agree with the experimental ones much better than the previous model, especially for the depth-distribution of D retained in W, which imply that this model is applicable to the evolution of defects especially for low energy high flux ions irradiated on plasma-facing materials.

Hydrogen retention properties of low Z and high Z plasma facing materials

1997 ◽  
Vol 241-243 ◽  
pp. 1016-1021 ◽  
Author(s):  
Y. Yamauchi ◽  
T. Hino ◽  
K. Koyama ◽  
Y. Hirohata ◽  
T. Yamashina
Keyword(s):  
Hydrogen Retention ◽  
Plasma Facing Materials

Recent Advances on Hydrogen Retention in ITER’s Plasma-Facing Materials: Beryllium, Carbon, and Tungsten

2008 ◽  
Vol 54 (4) ◽  
pp. 891-945 ◽  
Author(s):  
C. H. Skinner ◽  
A. A. Haasz ◽  
V. Kh. Alimov ◽  
N. Bekris ◽  
R. A. Causey ◽  
...  
Keyword(s):  
Recent Advances ◽  
Hydrogen Retention ◽  
Plasma Facing Materials ◽  
And Tungsten

Hydrogen retention in plasma-facing materials and its consequences on tokamak operation

1997 ◽  
Vol 241-243 ◽  
pp. 52-67 ◽  
Author(s):  
A.P. Zakharov ◽  
A.E. Gorodetsky ◽  
V.Kh. Alimov ◽  
S.L. Kanashenko ◽  
A.V. Markin
Keyword(s):  
Hydrogen Retention ◽  
Plasma Facing Materials

Microscopic versus process parameters in heavy-oil upgrading

1992 ◽  
Vol 50 (1) ◽  
pp. 366-367
Author(s):  
V.A. Munoz ◽  
R.J. Mikula ◽  
C. Payette ◽  
W.W. Lam
Keyword(s):  
Molecular Weight ◽  
Liquid Fuels ◽  
Chemical Components ◽  
Heavy Oils ◽  
Synthetic Fuels ◽  
High Hydrogen ◽  
Optical Texture ◽  
Polar Groups ◽  
Anisotropic Character ◽  
Planar Molecules

The transformation of high molecular weight components present in heavy oils into useable liquid fuels requires their decomposition by means of a variety of processes. The low molecular weight species produced recombine under controlled conditions to generate synthetic fuels. However, an important fraction undergo further recombination into higher molecular weight components, leading to the formation of coke. The optical texture of the coke can be related to its originating components. Those with high sulfur and oxygen content tend to produce cokes with small optical texture or fine mosaic, whereas compounds with relatively high hydrogen content are likely to produce large optical texture or domains. In addition, the structure of the parent chemical components, planar or nonplanar, determines the isotropic or anisotropic character of the coke. Planar molecules have a tendency to align in an approximately parallel arrangement to initiate the formation of the nematic mesophase leading to the formation of anisotropic coke. Nonplanar highly alkylated compounds and/or those rich in polar groups form isotropic coke. The aliphatic branches produce steric hindrance to alignment, whereas the polar groups participate in cross-linking reactions.

Nanocrystalline silicon ( nc-Si ) from single ion beam sputtering

2003 ◽  
Vol 762 ◽  
Author(s):  
Z.B. Zhou ◽  
G.M. Hadi ◽  
R.Q. Cui ◽  
Z.M. Ding ◽  
G. Li
Keyword(s):  
Solar Cell ◽  
Ion Beam ◽  
Nanocrystalline Silicon ◽  
Silicon Films ◽  
Chamber Pressure ◽  
Ion Beam Sputtering ◽  
High Hydrogen ◽  
Beam Sputtering ◽  
Si Films ◽  
Nanocrystalline Silicon Films

AbstractBased on a small set of selected publications on the using of nanocrystalline silicon films (nc-Si) for solar cell from 1997 to 2001, this paper reviews the application of nc-Si films as intrinsic layers in p-i-n solar cells. The new structure of nc-Si films deposited at high chamber pressure and high hydrogen dilution have characters of nanocrystalline grains with dimension about several tens of nanometer embedded in matrix of amorphous tissue and a high volume fraction of crystallinity (60~80%). The new nc-Si material have optical gap of 1.89 eV. The efficiency of this single junction solar cell reaches 8.7%. This nc-Si layer can be used not only as an intrinsic layer and as a p-type layer. Also nanocrystalline layer may be used as a seed layer for the growth of polycrystalline Si films at a low temperature.We used single ion beam sputtering methods to synthesize nanocrystalline silicon films successfully. The films were characterized with the technique of X-ray diffraction, Atomic Force Micrographs. We found that the films had a character of nc-amorphous double phase structure. Conductivity test at different temperatures presented the transportation of electrons dominated by different mechanism within different temperature ranges. Photoconductivity gains of the material were obtained in our recent investigation.

A netsemlegesség - definíciók, törvényhozói, tartalomszolgáltatói, internetszolgáltatói és felhasználói olvasatok

2017 ◽  
Vol 15 (3) ◽  
pp. 41
Author(s):  
Zoltán Szűts ◽  
Jinil Yoo
Keyword(s):  
Open Access ◽  
Social Communication ◽  
Service Providers ◽  
Net Neutrality ◽  
Internet Service Providers ◽  
Internet Service ◽  
Free Competition ◽  
Theoretical Insight

Tanulmányunk témája a netsemlegesség. Először magát a fogalmat definiáljuk többféle módon, majd a netsemlegességgel kapcsolatos törvényhozói, internet- és tartalomszolgáltatói, valamint felhasználói kihívásokat, problémákat és válaszokat mutatjuk be. Számos szerző szerint az internet legnagyobb, immár tradicionális értéke a nyíltság, sokszínűség, tartalomgazdagság, tértől és időtől független társadalmi és perszonális kommunikációba való szabad belépés és a szabad verseny lehetősége. A netsemlegesség mellett és ellen felhozott érvek bemutatását is ezek a szempontok alapján tesszük. Kiemelt szerepet kap a netsemlegesség megsértésének kategorizálása is. Tanulmányunkban közlünk egy törvényalkotási kronológiát, mely az USA-ra, az EU-ra és Kelet-Ázsiára fókuszál, illetve ismertetjük a BEREC 2011-es felmérésének az EU-ban alkalmazott, internetszolgáltatói gyakorlatra vonatkozó eredményeit. A munkát az Internet.org kezdeményezést vizsgáló esettanulmány zárja, végül ezt követik a jövővel kapcsolatos kérdések, és néhány lehetséges válasz. --- Net neutrality - definitions and the standpoints of legislators, content providers, Internet service providers and users This article examines the topic of net neutrality. Firstly, it provides us with a theoretical insight and several definitions. Then it presents the issues and challenges legislators, ISP’s, content providers and users face. Several authors state that the biggest virtue and value of Internet lies in open access, diversity, richness of content, free competition, and low barrier entry for users in order to participate in personal social communication. Our presentation of arguments pro and cons net neutrality will be built on the basis of these considerations. Priority will be given to the introduction of several categories of net neutrality violations. In our paper we will present a legislative chronology in the topic focusing on USA, EU and Korea-Japan as well as the findings of the 2011 BEREC survey. Finally we examine the Internet.org project. In the conclusion, the article offers several more issues to be discussed and provides some possible answers.

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