@inproceedings{11753, abstract = {Ferroelectric ceramic materials have a wide range of applications because of their piezoelectric and pyroelectric properties. One of their most important physical properties is the specific heat. In this study, the specific heats of a series of lead-zirconate-titanate (PZT) compositions in the vicinity of the morphotropic phase boundary (MPB) were measured. The temperature range was from 1.8 to 300 K. It is believed that these are the lowest temperature measurements ever made on PZT. Differences between the specific heats of the different compositions were very small. However, the calculated Debye temperatures were slightly different. The results are useful in computing design parameters for technical devices.}, author = {Lang, S. B. and Lashley, J. C. and Modic, Kimberly A and Fisher, R. A. and Zhu, W. M. and Ye, Z. G.}, booktitle = {Proceedings of the 2010 IEEE International Conference on Solid Dielectrics}, issn = {2159-1687}, location = {Potsdam, Germany}, publisher = {Institute of Electrical and Electronics Engineers}, title = {{Specific heat of a ferroelectric PZT ceramic at the morphotropic phase boundary}}, doi = {10.1109/icsd.2010.5568033}, year = {2010}, } @inproceedings{11754, abstract = {Ferroelectric ceramic materials have a wide range of applications because of their piezoelectric and pyroelectric properties. One of their most important physical properties is the specific heat. In this study, the specific heats of a series of lead-zirconate-titanate (PZT) compositions in the vicinity of the morphotropic phase boundary (MPB) were measured. The temperature range was from 1.8 to 300 K. It is believed that these are the lowest temperature measurements ever made on PZT. Differences between the specific heats of the different compositions were very small. However, the calculated Debye temperatures were slightly different. The results are useful in computing design parameters for technical devices.}, author = {Lang, S.B. and Lashley, J.C. and Modic, Kimberly A and Fisher, R.A. and Zhu, W.M. and Ye, Z.G.}, booktitle = {15th IEEE Mediterranean Electrotechnical Conference}, isbn = {978-142445795-3}, location = {Valletta, Malta}, publisher = {Institute of Electrical and Electronics Engineers}, title = {{Specific heat of a ferroelectric PZT ceramic at the morphotropic phase boundary}}, doi = {10.1109/melcon.2010.5476345}, year = {2010}, } @inproceedings{11797, abstract = {Inspired by online ad allocation, we study online stochastic packing integer programs from theoretical and practical standpoints. We first present a near-optimal online algorithm for a general class of packing integer programs which model various online resource allocation problems including online variants of routing, ad allocations, generalized assignment, and combinatorial auctions. As our main theoretical result, we prove that a simple dual training-based algorithm achieves a (1 − o(1))-approximation guarantee in the random order stochastic model. This is a significant improvement over logarithmic or constant-factor approximations for the adversarial variants of the same problems (e.g. factor 1−1𝑒 for online ad allocation, and log(m) for online routing). We then focus on the online display ad allocation problem and study the efficiency and fairness of various training-based and online allocation algorithms on data sets collected from real-life display ad allocation system. Our experimental evaluation confirms the effectiveness of training-based algorithms on real data sets, and also indicates an intrinsic trade-off between fairness and efficiency.}, author = {Feldman, Jon and Henzinger, Monika H and Korula, Nitish and Mirrokni, Vahab S. and Stein, Cliff}, booktitle = {18th Annual European Symposium on Algorithms}, isbn = {3642157742}, issn = {1611-3349}, location = {Liverpool, United Kingdom}, pages = {182–194}, publisher = {Springer Nature}, title = {{Online stochastic packing applied to display ad allocation}}, doi = {10.1007/978-3-642-15775-2_16}, volume = {6346}, year = {2010}, } @inproceedings{11798, abstract = {Starting with two models fifty years ago, the discrete marriage game [1] and the continuous assignment game [2], the study of stable matchings has evolved into a rich theory with applications in many areas. Most notably, it has lead to a number of truthful mechanisms that have seen a recent rejuvenation in the context of sponsored search. In this paper we survey the history of these problems and provide several links to ongoing research in the field.}, author = {Dütting, Paul and Henzinger, Monika H}, booktitle = {7th International Conference on Algorithms and Complexity}, isbn = {9783642130724}, issn = {1611-3349}, location = {Rome, Italy}, pages = {6–12}, publisher = {Springer Nature}, title = {{Mechanisms for the marriage and the assignment game}}, doi = {10.1007/978-3-642-13073-1_2}, volume = {6078}, year = {2010}, } @inproceedings{11838, abstract = {Two-sided matching markets play a prominent role in economic theory. A prime example of such a market is the sponsored search market where $n$ advertisers compete for the assignment of one of $k$ sponsored search results, also known as ``slots'', for certain keywords they are interested in. Here, as in other markets of that kind, market equilibria correspond to stable matchings. In this paper, we show how to modify Kuhn's Hungarian Method (Kuhn, 1955) so that it finds an optimal stable matching between advertisers and advertising slots in settings with generalized linear utilities, per-bidder-item reserve prices, and per-bidder-item maximum prices. The only algorithm for this problem presented so far (Aggarwal et al., 2009) requires the market to be in ''general position''. We do not make this assumption.}, author = {Dütting, Paul and Henzinger, Monika H and Weber, Ingmar}, booktitle = {27th International Symposium on Theoretical Aspects of Computer Science}, isbn = {978-3-939897-16-3}, issn = {1868-8969}, location = {Nancy, France}, pages = {287--298}, publisher = {Schloss Dagstuhl - Leibniz-Zentrum für Informatik}, title = {{Sponsored search, market equilibria, and the Hungarian Method}}, doi = {10.4230/LIPICS.STACS.2010.2463}, volume = {5}, year = {2010}, } @inproceedings{11863, abstract = {Suppose you buy a new laptop and, simply because you like it so much, you recommend it to friends, encouraging them to purchase it as well. What would be an adequate price for the vendor of the laptop to pay for your recommendation? Personal recommendations like this are of considerable commercial interest, but unlike in sponsored search auctions there can be no truthful prices. Despite this "lack of truthfulness" the vendor of the product might still decide to pay you for recommendation e.g. because she wants to (i) provide you with an additional incentive to actually recommend her or to (ii) increase your satisfaction and/or brand loyalty. This leads us to investigate a pricing scheme based on the Shapley value [5] that satisfies certain "axioms of fairness". We find that it is vulnerable to manipulations and show how to overcome these difficulties using the anonymity-proof Shapley value of [4].}, author = {Dütting, Paul and Henzinger, Monika H and Weber, Ingmar}, booktitle = {Proceedings of the 19th international conference on World wide web }, isbn = {9781605587998}, location = {Raleigh, NC, United States}, pages = {1085--1086}, publisher = {Association for Computing Machinery}, title = {{How much is your personal recommendation worth?}}, doi = {10.1145/1772690.1772816}, year = {2010}, } @article{11885, abstract = {Over the last years the h-index has gained popularity as a measure for comparing the impact of scientists. We investigate if ranking according to the h-index is stable with respect to (i) different choices of citation databases, (ii) normalizing citation counts by the number of authors or by removing self-citations, (iii) small amounts of noise created by randomly removing citations or publications and (iv) small changes in the definition of the index. In experiments for 5,283 computer scientists and 1,354 physicists we show that although the ranking of the h-index is stable under most of these changes, it is unstable when different databases are used. Therefore, comparisons based on the h-index should only be trusted when the rankings of multiple citation databases agree.}, author = {Henzinger, Monika H and Suñol, Jacob and Weber, Ingmar}, issn = {1588-2861}, journal = {Scientometrics}, number = {2}, pages = {465--479}, publisher = {Springer Nature}, title = {{The stability of the h-index}}, doi = {10.1007/s11192-009-0098-7}, volume = {84}, year = {2010}, } @article{11975, abstract = {A new method was developed for the quantitative analysis of steryl glycosides in biodiesel (fatty acid methyl esters). This method is much more sensitive than existing methods and has minimum limits of quantification of 50 μg/kg, compared to previously published minimum limits of quantification of about 15 mg/kg. The analysis is based on gas chromatography–mass spectroscopy determination of simple pre-treated and silylated samples via single ion monitoring at 147, 204, 217 m/z, which are specific ions for the silylated sugar moiety. Quantification was carried out using cholesteryl β-d-glucopyranoside as internal standard. The modified synthesis and purification of the internal standard is also presented as well as the characterization by NMR and mass spectroscopy. The advantage of the method compared with other approaches is the simplified sample preparation avoiding extra pre-treatment steps coupled with complete derivatization of the sugar hydroxyl groups by using N,O-bis(trimethylsilyl)acetamide with 5% trimethylchlorosilane as derivatization reagent. On the given conditions high recovery rates ≥89% can be obtained. Evaluation of lab specific variance and intermediate precision underline the robustness of the method which will be further assessed by Round robin tests.}, author = {Pieber, Bartholomäus and Schober, Sigurd and Goebl, Christoph and Mittelbach, Martin}, issn = {0021-9673}, journal = {Journal of Chromatography A}, number = {42}, pages = {6555--6561}, publisher = {Elsevier}, title = {{Novel sensitive determination of steryl glycosides in biodiesel by gas chromatography-mass spectroscopy}}, doi = {10.1016/j.chroma.2010.08.006}, volume = {1217}, year = {2010}, } @article{22023, abstract = {We consider the focusing energy-critical nonlinear Schrödinger equation iut + ∆u = −|u| 4 d−2 u in dimensions d ≥ 5. We prove that if a maximal-lifespan solution u : I × Rd → C obeys supt∈I k∇u(t)k2 < k∇Wk2, then it is global and scatters both forward and backward in time. Here W denotes the ground state, which is a stationary solution of the equation. In particular, if a solution has both energy and kinetic energy less than those of the ground state W at some point in time, then the solution is global and scatters. We also show that any solution that blows up with bounded kinetic energy must concentrate at least the kinetic energy of the ground state. Similar results were obtained by Kenig and Merle in [17, 18] for spherically symmetric initial data and dimensions d = 3, 4, 5.}, author = {Killip, Rowan and Visan, Monica}, issn = {1080-6377}, journal = {American Journal of Mathematics}, number = {2}, pages = {361--424}, publisher = {Johns Hopkins University Press}, title = {{The focusing energy-critical nonlinear Schrödinger equation in dimensions five and higher}}, doi = {10.1353/ajm.0.0107}, volume = {132}, year = {2010}, } @inbook{2309, abstract = {The importance of chloride ions in cell physiology has not been fully recognized until recently, in spite of the fact that chloride (Cl-), together with bicarbonate, is the most abundant free anion in animal cells, and performs or determines fundamental biological functions in all tissues. For many years it was thought that Cl- was distributed in thermodynamic equilibrium across the plasma membrane of most cells. Research carried out during the last couple of decades has led to a dramatic change in this simplistic view. We now know that most animal cells, neurons included, exhibit a non-equilibrium distribution of Cl- across their plasma membranes. Over the last 10 to 15 years, with the growth of molecular biology and the advent of new optical methods, an enormous amount of exciting new information has become available on the molecular structure and function of Cl- channels and carriers. In nerve cells, Cl- channels and carriers play key functional roles in GABA- and glycine-mediated synaptic inhibition, neuronal growth and development, extracellular potassium scavenging, sensory-transduction, neurotransmitter uptake and cell volume control. Disruption of Cl- homeostasis in neurons underlies pathological conditions such as epilepsy, deafness, imbalance, brain edema and ischemia, pain and neurogenic inflammation. This book is about how chloride ions are regulated and how they cross the plasma membrane of neurons. It spans from molecular structure and function of carriers and channels involved in Cl- transport to their role in various diseases. * The first comprehensive book on the structure, molecular biology, cell physiology, and role in diseases of chloride transporters / channels in the nervous system in almost 20 years * Chloride is the most abundant free anion in animal cells. THis book summarizes and integrates for the first time the important research of the past two decades that has shown that Cl- channels and carriers play key functional roles in GABA- and glycine-mediated synaptic inhibition, neuronal growth and development, extracellular potassium scavenging, sensory-transduction, neurotransmitter uptake and cell volume control. * The first book that systematically discusses the result of disruption of Cl- homeostasis in neurons which underlies pathological conditions such as epilepsy, deafness, imbalance, brain edema and ischemia, pain and neurogenic inflammation. * Spanning topics from molecular structure and function of carriers and channels involved in Cl- transport to their role in various diseases. * Involves all of the leading researchers in the field. * INcludes an extensive introductory section that covers basic thermodynamic and kinetics aspects of Cl- transport, as well as current methods for studying Cl- regulation, spanning from fluorescent dyes in single cells to knock-out models to make the book available for a growing population of graduate students and postdocs entering the field.}, author = {Stauber, Tobias and Gaia Novarino and Jentsch, Thomas J}, booktitle = {Physiology and Pathology of chloride transporters and channels in the nervous system}, pages = {209 -- 231}, publisher = {Elsevier}, title = {{The CLC family of chloride channels and transporters}}, doi = {10.1016/B978-0-12-374373-2.00012-1}, year = {2010}, } @article{231, abstract = {Let X be a projective cubic hypersurface of dimension 11 or more, which is defined over ℚ. We show that X(ℚ) is non-empty provided that the cubic form defining X can be written as the sum of two forms that share no common variables.}, author = {Timothy Browning and Colliot-Thélène, Jean-Louis}, journal = {Compositio Mathematica}, number = {4}, pages = {853 -- 885}, publisher = {Cambridge University Press}, title = {{Rational points on cubic hypersurfaces that split off a form. With an appendix by J-L Colliot-Thélène}}, doi = {10.1112/S0010437X0900459X}, volume = {146}, year = {2010}, } @article{2310, abstract = {Loss of the endosomal anion transport protein ClC-5 impairs renal endocytosis and underlies human Dent's disease. ClC-5 is thought to promote endocytosis by facilitating endosomal acidification through the neutralization of proton pump currents. However, ClC-5 is a 2 chloride (Cl-)/proton (H+) exchanger rather than a Cl- channel. We generated mice that carry the uncoupling E211A (unc) mutation that converts CLC-5 into a pure CL- conductor. Adenosine triphosphate (ATP)-dependent acidification of renal endosomes was reduced in mice in which ClC-5 was knocked out, but normal in Clcn5unc mice. However, their proximal tubular endocytosis was also impaired. Thus, endosomal chloride concentration, which is raised by CLC-5 in exchange for protons accumulated by the H+-ATPase, may play a role in endocytosis.}, author = {Gaia Novarino and Weinert, Stefanie and Rickheit, Gesa and Jentsch, Thomas J}, journal = {Science}, number = {5984}, pages = {1398 -- 1401}, publisher = {American Association for the Advancement of Science}, title = {{Endosomal chloride-proton exchange rather than chloride conductance is crucial for renal endocytosis}}, doi = {10.1126/science.1188070}, volume = {328}, year = {2010}, } @article{2311, abstract = {Inactivation of the mainly endosomal 2Cl-/H+- exchanger ClC-5 severely impairs endocytosis in renal proximal tubules and underlies the human kidney stone disorder Dent's disease. In heterologous expression systems, interaction of the E3 ubiquitin ligasesWWP2and Nedd4-2 with a "PY-motif" in the cytoplasmic C terminus of ClC-5 stimulates its internalization from the plasma membrane and may influence receptor-mediated endocytosis. We asked whether this interaction is relevant in vivo and generated mice in which the PY-motif was destroyed by a point mutation. Unlike ClC-5 knock-out mice, these knock-in mice displayed neither low molecular weight proteinuria nor hyperphosphaturia, and both receptor-mediated and fluid-phase endocytosis were normal. The abundances and localizations of the endocytic receptor megalin and of the Na+-coupled phosphate transporter NaPi-2a (Npt2) were not changed, either. To explore whether the discrepancy in results from heterologous expression studies might be due to heteromerization of ClC-5 with ClC-3 or ClC-4 in vivo, we studied knock-in mice additionally deleted for those related transporters. Disruption of neither ClC-3 nor ClC-4 led to proteinuria or impaired proximal tubular endocytosis by itself, nor in combination with the PY-mutant of ClC-5. Endocytosis of cells lacking ClC-5 was not impaired further when ClC-3 or ClC-4 was additionally deleted. We conclude that ClC-5 is unique among CLC proteins in being crucial for proximal tubular endocytosis and that PY-motif-dependent ubiquitylation of ClC-5 is dispensable for this role.}, author = {Rickheit, Gesa and Wartosch, Lena and Schaffer, Sven and Stobrawa, Sandra M and Gaia Novarino and Weinert, Stefanie and Jentsch, Thomas J}, journal = {Journal of Biological Chemistry}, number = {23}, pages = {17595 -- 17603}, publisher = {American Society for Biochemistry and Molecular Biology}, title = {{Role of ClC-5 in renal endocytosis is unique among ClC exchangers and does not require PY-motif-dependent ubiquitylation}}, doi = {10.1074/jbc.M110.115600}, volume = {285}, year = {2010}, } @article{232, abstract = {We study the average order of the divisor function, as it ranges over the values of binary quartic forms that are reducible over ℚ.}, author = {De La Bretèche, Régis and Browning, Timothy D}, journal = {Journal fur die Reine und Angewandte Mathematik}, number = {646}, pages = {1 -- 44}, publisher = {Walter de Gruyter}, title = {{Le problème des diviseurs pour des formes binaires de degré 4}}, doi = {10.1515/CRELLE.2010.064}, year = {2010}, } @inproceedings{2322, author = {Frank, Rupert L and Lieb, Élliott H and Robert Seiringer}, pages = {523 -- 535}, publisher = {World Scientific Publishing}, title = {{ Equivalence of Sobolev inequalities and Lieb-Thirring inequalities}}, doi = {10.1142/9789814304634_0045 }, year = {2010}, } @inproceedings{2323, abstract = {Since the first experimental realization of Bose-Einstein condensation in cold atomic gases in 1995 there has been a surge of activity in this field. Ingenious experiments have allowed us to probe matter close to zero temperature and reveal some of the fascinating effects quantum mechanics has bestowed on nature. It is a challenge for mathematical physicists to understand these various phenomena from first principles, that is, starting from the underlying many-body Schrödinger equation. Recent progress in this direction concerns mainly equilibrium properties of dilute, cold quantum gases. We shall explain some of the results in this article, and describe the mathematics involved in understanding these phenomena. Topics include the ground state energy and the free energy at positive temperature, the effect of interparticle interaction on the critical temperature for Bose-Einstein condensation, as well as the occurrence of superfluidity and quantized vortices in rapidly rotating gases.}, author = {Robert Seiringer}, pages = {231 -- 245}, publisher = {World Scientific Publishing}, title = {{Hot topics on cold gases}}, doi = {10.1142/9789814304634_0013}, year = {2010}, } @inbook{2324, abstract = {We determine the sharp constant in the Hardy inequality for fractional Sobolev spaces on half-spaces. Our proof relies on a nonlinear and nonlocal version of the ground state representation.}, author = {Frank, Rupert L and Robert Seiringer}, booktitle = {Around the Research of Vladimir Maz'ya I}, pages = {161 -- 167}, publisher = {Springer}, title = {{Sharp fractional Hardy inequalities in half-spaces}}, doi = {10.1007/978-1-4419-1341-8_6}, volume = {11}, year = {2010}, } @article{2389, abstract = {We study the eigenvalues of Schrödinger type operators T + λV and their asymptotic behavior in the small coupling limit λ → 0, in the case where the symbol of the kinetic energy, T (p), strongly degenerates on a non-trivial manifold of codimension one.}, author = {Hainzl, Christian and Robert Seiringer}, journal = {Mathematische Nachrichten}, number = {3}, pages = {489 -- 499}, publisher = {Wiley-Blackwell}, title = {{Asymptotic behavior of eigenvalues of Schrödinger type operators with degenerate kinetic energy}}, doi = {10.1002/mana.200810195}, volume = {283}, year = {2010}, } @article{2392, abstract = {The binding of polarons, or its absence, is an old and subtle topic. Here we prove two things rigorously. First, the transition from many-body collapse to the existence of a thermodynamic limit for N polarons occurs precisely at U=2α, where U is the electronic Coulomb repulsion and α is the polaron coupling constant. Second, if U is large enough, there is no multipolaron binding of any kind. Considering the known fact that there is binding for some U>2α, these conclusions are not obvious and their proof has been an open problem for some time.}, author = {Frank, Rupert L and Lieb, Élliott H and Robert Seiringer and Thomas, Lawrence E}, journal = {Physical Review Letters}, number = {21}, publisher = {American Physical Society}, title = {{Bipolaron and N-polaron binding energies}}, doi = {10.1103/PhysRevLett.104.210402}, volume = {104}, year = {2010}, } @article{2409, abstract = {Background: The availability of many gene alignments with overlapping taxon sets raises the question of which strategy is the best to infer species phylogenies from multiple gene information. Methods and programs abound that use the gene alignment in different ways to reconstruct the species tree. In particular, different methods combine the original data at different points along the way from the underlying sequences to the final tree. Accordingly, they are classified into superalignment, supertree and medium-level approaches. Here, we present a simulation study to compare different methods from each of these three approaches. Results: We observe that superalignment methods usually outperform the other approaches over a wide range of parameters including sparse data and gene-specific evolutionary parameters. In the presence of high incongruency among gene trees, however, other combination methods show better performance than the superalignment approach. Surprisingly, some supertree and medium-level methods exhibit, on average, worse results than a single gene phylogeny with complete taxon information. Conclusions: For some methods, using the reconstructed gene tree as an estimation of the species tree is superior to the combination of incomplete information. Superalignment usually performs best since it is less susceptible to stochastic error. Supertree methods can outperform superalignment in the presence of gene-tree conflict.}, author = {Kupczok, Anne and Schmidt, Heiko and Von Haeseler, Arndt}, journal = {Algorithms for Molecular Biology}, number = {1}, publisher = {BioMed Central}, title = {{Accuracy of phylogeny reconstruction methods combining overlapping gene data sets}}, doi = {10.1186/1748-7188-5-37}, volume = {5}, year = {2010}, }