@misc{42613, author = {{Fuchs, Christian}}, booktitle = {{Counterfire}}, title = {{{The Internet – serving the revolution?}}}, year = {{2010}}, } @article{8179, abstract = {{Given the density matrix rho of a bipartite quantum state, the quantum separability problem asks whether rho is entangled or separable. In 2003, Gurvits showed that this problem is NP-hard if rho is located within an inverse exponential (with respect to dimension) distance from the border of the set of separable quantum states. In this paper, we extend this NP-hardness to an inverse polynomial distance from the separable set. The result follows from a simple combination of works by Gurvits, Ioannou, and Liu. We apply our result to show (1) an immediate lower bound on the maximum distance between a bound entangled state and the separable set (assuming P != NP), and (2) NP-hardness for the problem of determining whether a completely positive trace-preserving linear map is entanglement-breaking.}}, author = {{Gharibian, Sevag}}, journal = {{Quantum Information & Computation}}, number = {{3{\&}4}}, pages = {{343--360}}, title = {{{Strong NP-hardness of the quantum separability problem}}}, volume = {{10}}, year = {{2010}}, } @article{34886, abstract = {{We give asymptotic upper and lower bounds for the number of squarefree d (0 < d ≤ X) such that the equation x² − dy²= −1 is solvable. These estimates, as usual, can equivalently be interpreted in terms of real quadratic fields with a fundamental unit with norm −1 and give strong evidence in the direction of a conjecture due to P. Stevenhagen.}}, author = {{Fouvry, Étienne and Klüners, Jürgen}}, issn = {{0003-486X}}, journal = {{Annals of Mathematics}}, keywords = {{Statistics, Probability and Uncertainty, Mathematics (miscellaneous)}}, number = {{3}}, pages = {{2035--2104}}, publisher = {{Annals of Mathematics}}, title = {{{On the negative Pell equation}}}, doi = {{10.4007/annals.2010.172.2035}}, volume = {{172}}, year = {{2010}}, } @article{34888, abstract = {{We call a positive square-free integer d special, if d is not divisible by primes congruent to 3 mod 4. We show that the period of the expansion of in continued fractions is asymptotically more often odd than even, when we restrict to special integers. We note that this period is always even for a non-special square-free integer d. It is well known that the above period is odd if and only if the negative Pell equation x²−dy²=−1 is solvable. The latter problem is solvable if and only if the narrow and the ordinary class groups of ℚ(√d) are equal. In a prior work we fully described the asymptotics of the 4-ranks of those class groups. Here we get the first non-trivial results about the asymptotic behavior of the 8-rank of the narrow class group. For example, we show that more than 76% of the quadratic fields ℚ(√d), where d is special, have the property that the 8-rank of the narrow class group is zero.}}, author = {{Fouvry, Étienne and Klüners, Jürgen}}, issn = {{0024-6115}}, journal = {{Proceedings of the London Mathematical Society}}, keywords = {{General Mathematics}}, number = {{2}}, pages = {{337--391}}, publisher = {{Wiley}}, title = {{{The parity of the period of the continued fraction of d}}}, doi = {{10.1112/plms/pdp057}}, volume = {{101}}, year = {{2010}}, } @article{34887, abstract = {{Let d be a nonsquare positive integer. We give the value of the natural probability that the narrow ideal class groups of the quadratic fields ℚ(√d) and ℚ(√−d) have the same 4-ranks. }}, author = {{Fouvry, Étienne and Klüners, Jürgen}}, issn = {{1937-0652}}, journal = {{Algebra & Number Theory}}, keywords = {{Algebra and Number Theory}}, number = {{5}}, pages = {{493--508}}, publisher = {{Mathematical Sciences Publishers}}, title = {{{On the Spiegelungssatz for the 4-rank}}}, doi = {{10.2140/ant.2010.4.493}}, volume = {{4}}, year = {{2010}}, } @book{40145, author = {{Fuchs, Christian}}, publisher = {{Routledge}}, title = {{{Internet and Society: Social Theory in the Information Age. Paperback}}}, year = {{2010}}, } @article{41660, author = {{Fuchs, Christian and Schafranek, Matthias and Hakken, David and Breen, Marcus}}, journal = {{tripleC (cognition, communication, co-operation)}}, number = {{2}}, pages = {{193--309}}, title = {{{Co-editor of the special issue “Capitalist crisis, communication & culture“}}}, volume = {{8}}, year = {{2010}}, } @article{41663, author = {{Fuchs, Christian}}, journal = {{Ethics and Information Technology}}, number = {{2}}, pages = {{171--185}}, title = {{{studiVZ: Social Networking Sites in the Surveillance Society}}}, volume = {{12}}, year = {{2010}}, } @article{41661, author = {{Fuchs, Christian}}, journal = {{The Information Society}}, number = {{3}}, pages = {{179--196}}, title = {{{Labor in Informational Capitalism and on the Internet}}}, volume = {{26}}, year = {{2010}}, } @article{41664, author = {{Fuchs, Christian}}, journal = {{Journal of Communication Inquiry}}, number = {{1}}, pages = {{15--41}}, title = {{{Grounding Critical Communication Studies}}}, volume = {{34}}, year = {{2010}}, } @article{41676, author = {{Fuchs, Christian and Hofkirchner, Wolfgang and Schafranek, Matthias and Raffl, Celina and Sandoval, Marisol and Bichler, Robert}}, journal = {{Future Internet}}, number = {{1}}, pages = {{41--59}}, title = {{{Theoretical Foundations of the Web: Cognition, Communication, and Co-operation. Towards an Understanding of Web 1.0, 2.0, 3.0}}}, doi = {{https://doi.org/10.3390/fi2010041}}, volume = {{2}}, year = {{2010}}, } @inbook{42410, author = {{Fuchs, Christian}}, booktitle = {{Handbook of Research on Web 2.0, 3.0, and X.0: Technologies, Business, and Social Applications, Volume II}}, editor = {{Murugesan, San}}, pages = {{764--789}}, publisher = {{PA: IGI-Global}}, title = {{{Social Software and Web 2.0: their Sociological Foundations and Implications}}}, year = {{2010}}, } @inbook{42411, author = {{Fuchs, Christian}}, booktitle = {{Indigenous Societies and Cultural Globalization in the 21st Century. Is the Global Village Truly Real?}}, editor = {{Ekeanyanwu, Nnamdi and Okeke, Chinedu}}, pages = {{556--594}}, publisher = {{VDM}}, title = {{{Global Media and Global Capitalism}}}, year = {{2010}}, } @article{42612, author = {{Fuchs, Christian}}, journal = {{DuD – Datenschutz und Datensicherheit 7/2010}}, pages = {{453--458}}, title = {{{Facebook, Web 2.0 und ökonomische Überwachung [Social networking sites, web 2.0 and economic surveillance]}}}, year = {{2010}}, } @misc{42614, author = {{Fuchs, Christian}}, booktitle = {{Information, Communication & Society}}, number = {{2}}, pages = {{280--282}}, title = {{{Review of “Communication Power“ (Manuel Castells)}}}, volume = {{13}}, year = {{2010}}, } @techreport{42725, author = {{Fuchs, Christian}}, issn = {{2219-603X}}, publisher = {{Unified Theory of Information Research Group. The Internet & Surveillance Research Paper No. 3}}, title = {{{Critique of the Political Economy of Web 2.0 Surveillance}}}, year = {{2010}}, } @misc{42853, author = {{Kraft, Kerstin}}, publisher = {{in: Antje van Elsbergen, Franziska Engelhardt, Simone Stiefbold (Hg.): Ansichten – Einsichten – Absichten, Marburg 2010, 246-262}}, title = {{{‚Über die Vierfaltigkeit und Vielfältigkeit des Textilen’}}}, year = {{2010}}, } @article{25971, abstract = {{Precipitation of zinc sulfide particles is a very rapid process, and monitoring of the particle growth is experimentally very demanding. Applying a liquid jet flow cell, we were able to follow zinc sulfide particle formation on time scales down to 10−5 s. The flow cell was designed in such a way that data acquisition on the microsecond time scale was possible under steady-state conditions along a liquid jet (tubular reactor concept), allowing SAXS data accumulation over a time scale of minutes. We were able to monitor the growth of zinc sulfide particles and found experimental evidence for very rapid particle aggregation processes within the liquid jet. Under the experimental conditions the particle growth is controlled by mass transfer: i.e., the diffusion of the hydrogen sulfide into the liquid jet.}}, author = {{Schmidt, Wolfgang and Bussian, Patrick and Lindén, Mika and Amenitsch, Heinz and Agren, Patrik and Tiemann, Michael and Schüth, Ferdi}}, issn = {{0002-7863}}, journal = {{Journal of the American Chemical Society}}, pages = {{6822--6826}}, title = {{{Accessing Ultrashort Reaction Times in Particle Formation with SAXS Experiments: ZnS Precipitation on the Microsecond Time Scale}}}, doi = {{10.1021/ja101519z}}, year = {{2010}}, } @article{25967, abstract = {{We report the structural characterization and gas sensing properties of mesoporous SnO2 synthesized by structure replication (nanocasting) from ordered mesoporous KIT-6 silica. The products show a high thermal stability with no structural loss up to 600 °C and only minor decrease in specific surface area by 18% at 800 °C, as proven by powder X-ray diffraction (PXRD), transmission electron microscopy (TEM), and nitrogen physisorption. In particular, the samples turn out to be much more stable than porous SnO2 materials prepared by sol–gel-based synthesis procedures for comparison. The thermal stability facilitates the utilization of the materials as sensors for combustible gases which react at high temperatures; test measurements reveal promising responses to methane (CH4) as an example.}}, author = {{Waitz, T. and Becker, B. and Wagner, T. and Sauerwald, T. and Kohl, C.-D. and Tiemann, Michael}}, issn = {{0925-4005}}, journal = {{Sensors and Actuators B: Chemical}}, pages = {{788--793}}, title = {{{Ordered nanoporous SnO2 gas sensors with high thermal stability}}}, doi = {{10.1016/j.snb.2010.08.001}}, year = {{2010}}, } @article{25972, abstract = {{In2O3 with ordered, uniform mesoporosity is prepared by nanocasting, using various porous silica phases (KIT-6, SBA-15) as structure matrices. The In2O3 particles exhibit well-defined morphologies (spherical or ellipsoidal, depending on the choice of silica matrix) and quite uniform sizes in the range of a few hundred nanometers. The regular morphology of the In2O3 particles is not associated with the morphological properties of the silica matrices. Instead, it is the result of the growth mechanism of In2O3 inside the silica pores; this mechanism is investigated in some detail. Hence, the nanocasting method offers a versatile and simple way of creating mesoporous In2O3 with regular morphology; this will be beneficial for many applications that require well-defined morphological properties, such as gas sensing or catalysis.}}, author = {{Haffer, Stefanie and Waitz, Thomas and Tiemann, Michael}}, issn = {{1932-7447}}, journal = {{The Journal of Physical Chemistry C}}, pages = {{2075--2081}}, title = {{{Mesoporous In2O3 with Regular Morphology by Nanocasting: A Simple Relation between Defined Particle Shape and Growth Mechanism}}}, doi = {{10.1021/jp910336f}}, year = {{2010}}, }