Download Access Controlled: The Shaping of Power, Rights, and Rule in by John Palfrey, Rafal Rohozinski, Jonathan Zittrain, Ronald PDF

By John Palfrey, Rafal Rohozinski, Jonathan Zittrain, Ronald Diebert

Stories on a brand new iteration of web controls that determine a brand new normative terrain during which surveillance and censorship are regimen.

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Ag þ 2BN þ 6H2 OðgÞ þ CO2 ðgÞ þ NO2 ðgÞ (3) After annealing at 300  C, silver clusters and amorphous BN with low nitrogen content were formed, and oxygen would be included in the BN matrix. After annealing at 700  C, t-BN layers were formed around the silver nanoparticles as a 30 T. Oku consequence of the reduction by H2 and crystallization of the BN matrix. Gibb’s energies on formula Eq. 3 were calculated as À282 and À611 kJ at 300 and 700  C, respectively, which support the proposed formulas.

As well as obtaining a large amount of BN nanocapsules, we have also succeeded in preparing these at a low temperature of 700  C. Previous BN nanocapsules produced by arc-discharge or arc-melting methods required ca. 3,000  C, and it was difficult to control the formation of BN nanocapsules. Use of a lower temperature allows better control of BN nanocapsule formation. Formation of the BN layer around the nanoparticles is also useful for cluster protection. In the present work, AgO nanoparticles were also observed to be encapsulated in BN nanocapsules after annealing at 700  C despite the fact that AgO ordinarily decomposes at ca.

A SEM image of a diamond particle with fivefold symmetry is shown in Fig. 12c. The particle with a size of 5 μm has a decahedral shape, and five twin 14 T. Oku Fig. 12 HREM images of gold nanoparticles (a) without and (b) with distortion. Twin planes are indicated by arrows. (c) SEM image of diamond particle. (d) Electron diffraction pattern of the diamond nanoparticle boundaries are designated by arrows. An electron diffraction pattern of diamond particles is shown in Fig. 12d. The electron diffraction pattern shows many diffraction spots, and all diffraction reflections are understood by overlapping five twinrelated diffraction reflections.

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