@article{7316,
  abstract     = {The nonaqueous rechargeable lithium–O2 battery containing an alkyl carbonate electrolyte discharges by formation of C3H6(OCO2Li)2, Li2CO3, HCO2Li, CH3CO2Li, CO2, and H2O at the cathode, due to electrolyte decomposition. Charging involves oxidation of C3H6(OCO2Li)2, Li2CO3, HCO2Li, CH3CO2Li accompanied by CO2 and H2O evolution. Mechanisms are proposed for the reactions on discharge and charge. The different pathways for discharge and charge are consistent with the widely observed voltage gap in Li–O2 cells. Oxidation of C3H6(OCO2Li)2 involves terminal carbonate groups leaving behind the OC3H6O moiety that reacts to form a thick gel on the Li anode. Li2CO3, HCO2Li, CH3CO2Li, and C3H6(OCO2Li)2 accumulate in the cathode on cycling correlating with capacity fading and cell failure. The latter is compounded by continuous consumption of the electrolyte on each discharge.},
  author       = {Freunberger, Stefan Alexander and Chen, Yuhui and Peng, Zhangquan and Griffin, John M. and Hardwick, Laurence J. and Bardé, Fanny and Novák, Petr and Bruce, Peter G.},
  issn         = {0002-7863},
  journal      = {Journal of the American Chemical Society},
  number       = {20},
  pages        = {8040--8047},
  publisher    = {ACS},
  title        = {{Reactions in the rechargeable Lithium–O2 battery with alkyl carbonate electrolytes}},
  doi          = {10.1021/ja2021747},
  volume       = {133},
  year         = {2011},
}

@article{7317,
  abstract     = {Lithium-metal oxides with a high formal Li2O content, such as Li5FeO4 (5Li2O•Fe2O3) and a Li2MnO3•LiFeO2 composite ({Li2O•MnO2}•{Li2O•Fe2O3}) have been explored as electrocatalysts for primary and rechargeable Li-O2 cells. Activation occurs predominantly by Li2O removal, either electrochemically or chemically by acid-treatment. Superior electrochemical behavior is obtained if activation occurs by acid-treatment; Li2MnO3•LiFeO2 catalysts provide 2516 mAh/g (carbon) corresponding to 931 mAh/g (electrocatalyst + carbon) during the initial discharge. The reaction is reasonably reversible during the early cycles. The approach has implications for designing electrocatalysts that participate through electrochemical Li2O extraction/reformation reactions, offering exceptionally high capacities.},
  author       = {Trahey, L. and Johnson, C. S. and Vaughey, J. T. and Kang, S.-H. and Hardwick, L. J. and Freunberger, Stefan Alexander and Bruce, P. G. and Thackeray, M. M.},
  issn         = {1099-0062},
  journal      = {Electrochemical and Solid-State Letters},
  number       = {5},
  publisher    = {The Electrochemical Society},
  title        = {{Activated Lithium-Metal-Oxides as catalytic electrodes for Li–O2 cells}},
  doi          = {10.1149/1.3555366},
  volume       = {14},
  year         = {2011},
}

@inproceedings{757,
  abstract     = {Synchronous distributed algorithms are easier to design and prove correct than algorithms that tolerate asynchrony. Yet, in the real world, networks experience asynchrony and other timing anomalies. In this paper, we address the question of how to efficiently transform an algorithm that relies on synchronization into an algorithm that tolerates asynchronous executions. We introduce a transformation technique from synchronous algorithms to indulgent algorithms [1], which induces only a constant overhead in terms of time complexity in well-behaved executions. Our technique is based on a new abstraction we call an asynchrony detector, which the participating processes implement collectively. The resulting transformation works for a large class of colorless tasks, including consensus and set agreement. Interestingly, we also show that our technique is relevant for colored tasks, by applying it to the renaming problem, to obtain the first indulgent renaming algorithm.},
  author       = {Alistarh, Dan-Adrian and Gilbert, Seth and Guerraoui, Rachid and Travers, Corentin},
  pages        = {41 -- 52},
  publisher    = {Springer},
  title        = {{Generating fast indulgent algorithms}},
  doi          = {10.1007/978-3-642-17679-1_4},
  volume       = {6522 LNCS},
  year         = {2011},
}

@inproceedings{759,
  abstract     = {We study the complexity of renaming, a fundamental problem in distributed computing in which a set of processes need to pick distinct names from a given namespace. We prove an individual lower bound of Ω(k) process steps for deterministic renaming into any namespace of size sub-exponential in k, where k is the number of participants. This bound is tight: it draws an exponential separation between deterministic and randomized solutions, and implies new tight bounds for deterministic fetch-and-increment registers, queues and stacks. The proof of the bound is interesting in its own right, for it relies on the first reduction from renaming to another fundamental problem in distributed computing: mutual exclusion. We complement our individual bound with a global lower bound of Ω(k log (k/c)) on the total step complexity of renaming into a namespace of size ck, for any c ≥ 1. This applies to randomized algorithms against a strong adversary, and helps derive new global lower bounds for randomized approximate counter and fetch-and-increment implementations, all tight within logarithmic factors.},
  author       = {Alistarh, Dan-Adrian and Aspnes, James and Gilbert, Seth and Guerraoui, Rachid},
  pages        = {718 -- 727},
  publisher    = {IEEE},
  title        = {{The complexity of renaming}},
  doi          = {10.1109/FOCS.2011.66},
  year         = {2011},
}

@inproceedings{760,
  abstract     = {A randomized implementation is given of a test-and-set register with O(log log n) individual step complexity and O(n) total step complexity against an oblivious adversary. The implementation is linearizable and multi-shot, and shows an exponential complexity improvement over previous solutions designed to work against a strong adversary.},
  author       = {Alistarh, Dan-Adrian and Aspnes, James},
  pages        = {97 -- 109},
  publisher    = {Springer},
  title        = {{Sub-logarithmic test-and-set against a weak adversary}},
  doi          = {10.1007/978-3-642-24100-0_7},
  volume       = {6950 LNCS},
  year         = {2011},
}

@inproceedings{761,
  abstract     = {We give two new randomized algorithms for strong renaming, both of which work against an adaptive adversary in asynchronous shared memory. The first uses repeated sampling over a sequence of arrays of decreasing size to assign unique names to each of n processes with step complexity O(log3 n). The second transforms any sorting network into a strong adaptive renaming protocol, with an expected cost equal to the depth of the sorting network. Using an AKS sorting network, this gives a strong adaptive renaming algorithm with step complexity O(log k), where k is the contention in the current execution. We show this to be optimal based on a classic lower bound of Jayanti. We also show that any such strong renaming protocol can be used to build a monotone-consistent counter with logarithmic step complexity (at the cost of adding a max register) or a linearizable fetch-and-increment register (at the cost of increasing the step complexity by a logarithmic factor).},
  author       = {Alistarh, Dan-Adrian and Aspnes, James and Censor Hillel, Keren and Gilbert, Seth and Zadimoghaddam, Morteza},
  pages        = {239 -- 248},
  publisher    = {ACM},
  title        = {{Optimal-time adaptive strong renaming, with applications to counting}},
  doi          = {10.1145/1993806.1993850},
  year         = {2011},
}

@article{7701,
  abstract     = {During assembly of the Drosophila olfactory circuit, projection neuron (PN) dendrites prepattern the developing antennal lobe before the arrival of axons from their presynaptic partners, the adult olfactory receptor neurons (ORNs). We previously found that levels of transmembrane Semaphorin-1a, which acts as a receptor, instruct PN dendrite targeting along the dorsolateral-ventromedial axis. Here we show that two secreted semaphorins, Sema-2a and Sema-2b, provide spatial cues for PN dendrite targeting. Sema-2a and Sema-2b proteins are distributed in gradients opposing the Sema-1a protein gradient, and Sema-1a binds to Sema-2a-expressing cells. In Sema-2a and Sema-2b double mutants, PN dendrites that normally target dorsolaterally in the antennal lobe mistarget ventromedially, phenocopying cell-autonomous Sema-1a removal from these PNs. Cell ablation, cell-specific knockdown, and rescue experiments indicate that secreted semaphorins from degenerating larval ORN axons direct dendrite targeting. Thus, a degenerating brain structure instructs the wiring of a developing circuit through the repulsive action of secreted semaphorins.},
  author       = {Sweeney, Lora Beatrice Jaeger and Chou, Ya-Hui and Wu, Zhuhao and Joo, William and Komiyama, Takaki and Potter, Christopher J. and Kolodkin, Alex L. and Garcia, K. Christopher and Luo, Liqun},
  issn         = {0896-6273},
  journal      = {Neuron},
  number       = {5},
  pages        = {734--747},
  publisher    = {Elsevier},
  title        = {{Secreted semaphorins from degenerating larval ORN axons direct adult projection neuron dendrite targeting}},
  doi          = {10.1016/j.neuron.2011.09.026},
  volume       = {72},
  year         = {2011},
}

@article{7702,
  abstract     = {Longitudinal axon fascicles within the Drosophila embryonic CNS provide connections between body segments and are required for coordinated neural signaling along the anterior-posterior axis. We show here that establishment of select CNS longitudinal tracts and formation of precise mechanosensory afferent innervation to the same CNS region are coordinately regulated by the secreted semaphorins Sema-2a and Sema-2b. Both Sema-2a and Sema-2b utilize the same neuronal receptor, plexin B (PlexB), but serve distinct guidance functions. Localized Sema-2b attraction promotes the initial assembly of a subset of CNS longitudinal projections and subsequent targeting of chordotonal sensory afferent axons to these same longitudinal connectives, whereas broader Sema-2a repulsion serves to prevent aberrant innervation. In the absence of Sema-2b or PlexB, chordotonal afferent connectivity within the CNS is severely disrupted, resulting in specific larval behavioral deficits. These results reveal that distinct semaphorin-mediated guidance functions converge at PlexB and are critical for functional neural circuit assembly.},
  author       = {Wu, Zhuhao and Sweeney, Lora Beatrice Jaeger and Ayoob, Joseph C. and Chak, Kayam and Andreone, Benjamin J. and Ohyama, Tomoko and Kerr, Rex and Luo, Liqun and Zlatic, Marta and Kolodkin, Alex L.},
  issn         = {0896-6273},
  journal      = {Neuron},
  number       = {2},
  pages        = {281--298},
  publisher    = {Elsevier},
  title        = {{A combinatorial semaphorin code instructs the initial steps of sensory circuit assembly in the Drosophila CNS}},
  doi          = {10.1016/j.neuron.2011.02.050},
  volume       = {70},
  year         = {2011},
}

@article{7750,
  author       = {Robinson, Matthew Richard},
  issn         = {1465-7279},
  journal      = {Behavioral Ecology},
  number       = {6},
  pages        = {1143--1144},
  publisher    = {Oxford University Press},
  title        = {{Understanding intrasexual competition and sexual selection requires an evolutionary ecology framework}},
  doi          = {10.1093/beheco/arr110},
  volume       = {22},
  year         = {2011},
}

@article{8025,
  abstract     = {Chandelier (axoaxonic) cells (ChCs) are a distinct group of GABAergic interneurons that innervate the axon initial segments of pyramidal cells. However, their circuit role and the function of their clearly defined anatomical specificity remain unclear. Recent work has demonstrated that chandelier cells can produce depolarizing GABAergic PSPs, occasionally driving postsynaptic targets to spike. On the other hand, other work suggests that ChCs are hyperpolarizing and may have an inhibitory role. These disparate functional effects may reflect heterogeneity among ChCs. Here, using brain slices from transgenic mouse strains, we first demonstrate that, across different neocortical areas and genetic backgrounds, upper Layer 2/3 ChCs belong to a single electrophysiologically and morphologically defined population, extensively sampling Layer 1 inputs with asymmetric dendrites. Consistent with being a single cell type, we find electrical coupling between ChCs. We then investigate the effect of chandelier cell activation on pyramidal neuron spiking in several conditions, ranging from the resting membrane potential to stimuli designed to approximate in vivo membrane potential dynamics. We find that under quiescent conditions, chandelier cells are capable of both promoting and inhibiting spike generation, depending on the postsynaptic membrane potential. However, during in vivo-like membrane potential fluctuations, the dominant postsynaptic effect was a strong inhibition. Thus, neocortical chandelier cells, even from within a homogeneous population, appear to play a dual role in the circuit, helping to activate quiescent pyramidal neurons, while at the same time inhibiting active ones.},
  author       = {Woodruff, A. R. and McGarry, L. M. and Vogels, Tim P and Inan, M. and Anderson, S. A. and Yuste, R.},
  issn         = {0270-6474},
  journal      = {Journal of Neuroscience},
  number       = {49},
  pages        = {17872--17886},
  publisher    = {Society for Neuroscience},
  title        = {{State-dependent function of neocortical chandelier cells}},
  doi          = {10.1523/jneurosci.3894-11.2011},
  volume       = {31},
  year         = {2011},
}

@article{8074,
  abstract     = {Cortical neurons receive balanced excitatory and inhibitory synaptic currents. Such a balance could be established and maintained in an experience-dependent manner by synaptic plasticity at inhibitory synapses. We show that this mechanism provides an explanation for the sparse firing patterns observed in response to natural stimuli and fits well with a recently observed interaction of excitatory and inhibitory receptive field plasticity. The introduction of inhibitory plasticity in suitable recurrent networks provides a homeostatic mechanism that leads to asynchronous irregular network states. Further, it can accommodate synaptic memories with activity patterns that become indiscernible from the background state but can be reactivated by external stimuli. Our results suggest an essential role of inhibitory plasticity in the formation and maintenance of functional cortical circuitry.},
  author       = {Vogels, Tim P and Sprekeler, H. and Zenke, F. and Clopath, C. and Gerstner, W.},
  issn         = {0036-8075},
  journal      = {Science},
  number       = {6062},
  pages        = {1569--1573},
  publisher    = {American Association for the Advancement of Science},
  title        = {{Inhibitory plasticity balances excitation and inhibition in sensory pathways and memory networks}},
  doi          = {10.1126/science.1211095},
  volume       = {334},
  year         = {2011},
}

@article{1723,
  abstract     = {The emergence of differences in the arrangement of cells is the first step towards the establishment of many organs. Understanding this process is limited by the lack of systematic characterization of epithelial organisation. Here we apply network theory at the scale of individual cells to uncover patterns in cell-to-cell contacts that govern epithelial organisation. We provide an objective characterisation of epithelia using network representation, where cells are nodes and cell contacts are links. The features of individual cells, together with attributes of the cellular network, produce a defining signature that distinguishes epithelia from different organs, species, developmental stages and genetic conditions. The approach permits characterization, quantification and classification of normal and perturbed epithelia, and establishes a framework for understanding molecular mechanisms that underpin the architecture of complex tissues.},
  author       = {Escudero, Luis M and Costa, Luciano and Anna Kicheva and Briscoe, James and Freeman, Matthew and Babu, Madan M},
  journal      = {Nature Communications},
  number       = {1},
  publisher    = {Nature Publishing Group},
  title        = {{Epithelial organisation revealed by a network of cellular contacts}},
  doi          = {10.1038/ncomms1536},
  volume       = {2},
  year         = {2011},
}

@article{1724,
  abstract     = {Morphogens, such as Decapentaplegic (Dpp) in the fly imaginal discs, form graded concentration profiles that control patterning and growth of developing organs. In the imaginal discs, proliferative growth is homogeneous in space, posing the conundrum of how morphogen concentration gradients could control position-independent growth. To understand the mechanism of proliferation control by the Dpp gradient, we quantified Dpp concentration and signaling levels during wing disc growth. Both Dpp concentration and signaling gradients scale with tissue size during development. On average, cells divide when Dpp signaling levels have increased by 50%. Our observations are consistent with a growth control mechanism based on temporal changes of cellular morphogen signaling levels. For a scaling gradient, this mechanism generates position-independent growth rates.},
  author       = {Wartlick, Ortrud and Mumcu, Peer and Anna Kicheva and Bittig, Thomas and Seum, Carole and Jülicher, Frank and González-Gaitán, Marcos A},
  journal      = {Science},
  number       = {6021},
  pages        = {1154 -- 1159},
  publisher    = {American Association for the Advancement of Science},
  title        = {{Dynamics of Dpp signaling and proliferation control}},
  doi          = {10.1126/science.1200037},
  volume       = {331},
  year         = {2011},
}

@article{1754,
  abstract     = {We report on a technique enabling electrical control of the contact silicidation process in silicon nanowire devices. Undoped silicon nanowires were contacted by pairs of nickel electrodes and each contact was selectively silicided by means of the Joule effect. By a realtime monitoring of the nanowire electrical resistance during the contact silicidation process we were able to fabricate nickel-silicide/silicon/nickel- silicide devices with controlled silicon channel length down to 8 nm. },
  author       = {Mongillo, Massimo and Spathis, Panayotis and Katsaros, Georgios and Gentile, Pascal and Sanquer, Marc and De Franceschi, Silvano},
  journal      = {ACS Nano},
  number       = {9},
  pages        = {7117 -- 7123},
  publisher    = {American Chemical Society},
  title        = {{Joule-assisted silicidation for short-channel silicon nanowire devices}},
  doi          = {10.1021/nn202524j},
  volume       = {5},
  year         = {2011},
}

@article{1755,
  abstract     = {Spin-selective tunneling of holes in SiGe nanocrystals contacted by normal-metal leads is reported. The spin selectivity arises from an interplay of the orbital effect of the magnetic field with the strong spin-orbit interaction present in the valence band of the semiconductor. We demonstrate both experimentally and theoretically that spin-selective tunneling in semiconductor nanostructures can be achieved without the use of ferromagnetic contacts. The reported effect, which relies on mixing the light and heavy holes, should be observable in a broad class of quantum-dot systems formed in semiconductors with a degenerate valence band.},
  author       = {Georgios Katsaros and Golovach, Vitaly N and Spathis, Panayotis N and Ares, Natalia and Stoffel, Mathieu and Fournel, Frank and Schmidt, Oliver G and Glazman, Leonid I and De Franceschi, Silvano},
  journal      = {Physical Review Letters},
  number       = {24},
  publisher    = {American Physical Society},
  title        = {{Observation of spin-selective tunneling in sige nanocrystals}},
  doi          = {10.1103/PhysRevLett.107.246601},
  volume       = {107},
  year         = {2011},
}

@article{1775,
  abstract     = {At optical frequencies the radiation produced by a source, such as a laser, a black body or a single-photon emitter, is frequently characterized by analysing the temporal correlations of emitted photons using single-photon counters. At microwave frequencies, however, there are no efficient single-photon counters yet. Instead, well-developed linear amplifiers allow for efficient measurement of the amplitude of an electromagnetic field. Here, we demonstrate first- and second-order correlation function measurements of a pulsed microwave-frequency single-photon source integrated on the same chip with a 50/50 beam splitter followed by linear amplifiers and quadrature amplitude detectors. We clearly observe single-photon coherence in first-order and photon antibunching in second-order correlation function measurements of the propagating fields.},
  author       = {Bozyigit, Deniz and Lang, C and Steffen, L. Kraig and Johannes Fink and Eichler, Christopher and Baur, Matthias P and Bianchetti, R and Leek, Peter J and Filipp, Stefan and Da Silva, Marcus P and Blais, Alexandre and Wallraff, Andreas},
  journal      = {Nature Physics},
  number       = {2},
  pages        = {154 -- 158},
  publisher    = {Nature Publishing Group},
  title        = {{Antibunching of microwave-frequency photons observed in correlation measurements using linear detectors}},
  doi          = {10.1038/nphys1845},
  volume       = {7},
  year         = {2011},
}

@inproceedings{1776,
  abstract     = {Superconducting circuits have been successfully established as systems to prepare and investigate microwave light fields at the quantum level. In contrast to optical experiments where light is detected using photon counters, microwaves are usually measured with well developed linear amplifiers. This makes measurements of correlation functions - one of the important tools in optics - harder to achieve because they traditionally rely on photon counters and beam splitters. Here, we demonstrate a system where we can prepare on demand single microwave photons in a cavity and detect them at the two outputs of the cavity using linear amplifiers. Together with efficient data processing, this allows us to measure different observables of the cavity photons, including the first-order correlation function. Using these techniques we demonstrate cooling of a thermal background field in the cavity.},
  author       = {Bozyigit, Deniz and Lang, C and Steffen, L. Kraig and Johannes Fink and Eichler, Christopher and Baur, Matthias P and Bianchetti, R and Leek, Peter J and Filipp, Stefan and Wallraff, Andreas and Da Silva, Marcus P and Blais, Alexandre},
  number       = {1},
  publisher    = {IOP Publishing Ltd.},
  title        = {{Correlation measurements of individual microwave photons emitted from a symmetric cavity}},
  doi          = {10.1088/1742-6596/264/1/012024},
  volume       = {264},
  year         = {2011},
}

@article{1777,
  abstract     = {A wide range of experiments studying microwave photons localized in superconducting cavities have made important contributions to our understanding of the quantum properties of radiation. Propagating microwave photons, however, have so far been studied much less intensely. Here we present measurements in which we reconstruct the quantum state of itinerant single photon Fock states and their superposition with the vacuum by analyzing moments of the measured amplitude distribution up to fourth order. Using linear amplifiers and quadrature amplitude detectors, we have developed efficient methods to separate the detected single photon signal from the noise added by the amplifier. From our measurement data we have also reconstructed the corresponding Wigner function.},
  author       = {Eichler, Christopher and Bozyigit, Deniz and Lang, C and Steffen, L. and Fink, Johannes M and Wallraff, Andreas},
  journal      = {Physical Review Letters},
  number       = {22},
  publisher    = {American Physical Society},
  title        = {{Experimental state tomography of itinerant single microwave photons}},
  doi          = {10.1103/PhysRevLett.106.220503},
  volume       = {106},
  year         = {2011},
}

@article{1778,
  abstract     = {Creating a train of single photons and monitoring its propagation and interaction is challenging in most physical systems, as photons generally interact very weakly with other systems. However, when confining microwave frequency photons in a transmission line resonator, effective photon-photon interactions can be mediated by qubits embedded in the resonator. Here, we observe the phenomenon of photon blockade through second-order correlation function measurements. The experiments clearly demonstrate antibunching in a continuously pumped source of single microwave photons measured by using microwave beam splitters, linear amplifiers, and quadrature amplitude detectors. We also investigate resonance fluorescence and Rayleigh scattering in Mollow-triplet-like spectra.},
  author       = {Lang, C and Bozyigit, Deniz and Eichler, Christopher and Steffen, L. Kraig and Johannes Fink and Abdumalikov, Abdufarrukh A and Baur, Matthias P and Filipp, Stefan and Da Silva, Marcus P and Blais, Alexandre and Wallraff, Andreas},
  journal      = {Physical Review Letters},
  number       = {24},
  publisher    = {American Physical Society},
  title        = {{Observation of resonant photon blockade at microwave frequencies using correlation function measurements}},
  doi          = {10.1103/PhysRevLett.106.243601},
  volume       = {106},
  year         = {2011},
}

@article{1780,
  abstract     = {Continuous variable entanglement between two modes of a radiation field is usually studied at optical frequencies. Here we demonstrate experiments that show the entanglement between microwave photons of different energy in a broadband squeezed beam. We use a Josephson parametric amplifier to generate the two-mode correlated state and detect all four quadrature components simultaneously in a two-channel heterodyne setup using amplitude detectors. Analyzing two-dimensional phase space histograms for all possible pairs of quadratures allows us to determine the full covariance matrix, which is in good agreement with the one expected for a two-mode squeezed state.},
  author       = {Eichler, Christopher and Bozyigit, Deniz and Lang, C and Baur, Matthias P and Steffen, L. Kraig and Johannes Fink and Filipp, Stefan and Wallraff, Andreas},
  journal      = {Physical Review Letters},
  number       = {11},
  publisher    = {American Physical Society},
  title        = {{Observation of two-mode squeezing in the microwave frequency domain}},
  doi          = {10.1103/PhysRevLett.107.113601},
  volume       = {107},
  year         = {2011},
}