106 research outputs found
Strings from Tachyons
We propose a new interpretation of the c=1 matrix model as the world-line
theory of N unstable D-particles, in which the hermitian matrix is provided by
the non- abelian open string tachyon. For D-particles in 1+1-d string theory,
we find a direct quantitative match between the closed string emission due to a
rolling tachyon and that due to a rolling eigenvalue in the matrix model. We
explain the origin of the double-scaling limit, and interpret it as an extreme
representative of a large equivalence class of dual theories. Finally, we
define a concrete decoupling limit of unstable D-particles in IIB string theory
that reduces to the c=1 matrix model, suggesting that 1+1-d string theory
represents the near-horizon limit of an ultra-dense gas of IIB D-particles.Comment: 30 pages, 4 figures; v2: added references, improved discussion of
Liouville boundary states, v3: small correction
Shanghaied into the future: the Asianization of the future Metropolis in post-Blade Runner cinema
The clichĂ©d 1930â1950 Western cinematic images of Shanghai as a fascinating den of iniquity, and, in contrast, as a beacon of modernity, were merged in Fritz Langâs Metropolis. As a result, a new standard emerged in science ction lms for the representation of future urban conglomerates: the Asianized metropolis. e standard set by this lm, of a dark dystopian city, populated by creatures of all races and genetic codes, will be adopted in most of the representations of future cities in non-Asian cinema. is article traces the representation of Shanghai in Western cinema from its earliest days (1932â Shanghai Express) through Blade Runner (1982) to the present (2013â Her). Shanghai, already in the early 1930s, sported extremely daring examples of modern architecture and, at the same time, in non-Asian cinema, was represented as a city of sin and depravity. is dualistic representation became the standard image of the future Asianized city, where its debauchery was o en complemented by modernity; therefore, it is all the more seedy. Moreover, it is Asianized, the âYellow Perilâ incarnated in a new, much more subtle, much more dangerous way. As such, it is deserving of destruction, like Sodom and Gomorrah
More Human than Human!: How Recent Hollywood Films Depict Enhancement Technologies â And Why
Formation of nitrogen structures by ammoxidation of organic materials: FT-IR/PAS studies
The paper reports the effect of ammoxidation on formation
of nitrogen structures on the surface of carbonaceous materials
characterized by different degree of coalification. Nitrogen structures
formed depend on the way of chemical and thermal treatment of the source
material
Speciation of functional groups formed on the surface of carbonaceous materials modified by NO
Interactions between NO and the surface of carbonaceous materials
characterised by different degree of coalification (brown coal and
sub-bituminous coal) have been studied by FTIR-PAS in order to
identify the nitrogen species formed
Effect of the Powder Consolidation Method Type on the Microstructure and Selected Properties of Al2O3-Cu-Ni Composite
The present research is focused on the characterization of the composites from Al2O3-Cu-Ni system. Two methods of ceramic-metal composite forming were applied: uniaxial powder pressing and Pulse Plasma Sintering (PPS). To obtain the samples the powder mixtures containing 85 vol.% of Al2O3 and 15 vol.% of metal powders were used. Influence of the sintering process on microstructure and mechanical properties of the two series of the composites was analyzed in detail. The selected physical properties of samples were characterized by Archimedes immersion method. Vickers hardness and the fracture toughness of the composites was determined as well. The microstructure of the composites was characterized by XRD, SEM, EDX. Fractography investigation was carried out as well. Independently on composite production method Al2O3, Cu, Ni, and CuNi phases were revealed. Fractography investigation results revealed different character of fracture in dependence of fabrication method. Pulse Plasma Sintered samples were characterized by higher crack resistance and higher Vickers hardness in comparison to the specimens manufactured by uniaxial pressing
Identification of functional groups on the surface of modified organic materials using the FT-IR/PAS method
Interactions between NO and the surface of waste plum
stones have been studied by FTIR-PAS in order to identify the nitrogen species formed. It is possible
that there are some additional active centres generated on their surface.
Identification of surface functional groups was needed to characterize their
influence on the properties of obtained materials which were used as
catalyst support in our further research
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