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1,034 results on '"Mayer, Christoph"'

1. Invasive Staphylococcus epidermidis uses a unique processive wall teichoic acid glycosyltransferase to evade immune recognition.

Author

Guo, Yinglan, Du, Xin, Krusche, Janes, Beck, Christian, Ali, Sara, Walter, Axel, Winstel, Volker, Mayer, Christoph, Codée, Jeroen, Peschel, Andreas, and Stehle, Thilo

Subjects
Humans, Glycosyltransferases, Staphylococcus aureus, Staphylococcus epidermidis, Teichoic Acids, Uridine Diphosphate, Glucose, Phosphates
Abstract

Staphylococcus epidermidis expresses glycerol phosphate wall teichoic acid (WTA), but some health care-associated methicillin-resistant S. epidermidis (HA-MRSE) clones produce a second, ribitol phosphate (RboP) WTA, resembling that of the aggressive pathogen Staphylococcus aureus. RboP-WTA promotes HA-MRSE persistence and virulence in bloodstream infections. We report here that the TarM enzyme of HA-MRSE [TarM(Se)] glycosylates RboP-WTA with glucose, instead of N-acetylglucosamine (GlcNAc) by TarM(Sa) in S. aureus. Replacement of GlcNAc with glucose in RboP-WTA impairs HA-MRSE detection by human immunoglobulin G, which may contribute to the immune-evasion capacities of many invasive S. epidermidis. Crystal structures of complexes with uridine diphosphate glucose (UDP-glucose), and with UDP and glycosylated poly(RboP), reveal the binding mode and glycosylation mechanism of this enzyme and explain why TarM(Se) and TarM(Sa) link different sugars to poly(RboP). These structural data provide evidence that TarM(Se) is a processive WTA glycosyltransferase. Our study will support the targeted inhibition of TarM enzymes, and the development of RboP-WTA targeting vaccines and phage therapies.

Published
2023

2. Beyond SOT: Tracking Multiple Generic Objects at Once

Author

Mayer, Christoph, Danelljan, Martin, Yang, Ming-Hsuan, Ferrari, Vittorio, Van Gool, Luc, and Kuznetsova, Alina

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

Generic Object Tracking (GOT) is the problem of tracking target objects, specified by bounding boxes in the first frame of a video. While the task has received much attention in the last decades, researchers have almost exclusively focused on the single object setting. Multi-object GOT benefits from a wider applicability, rendering it more attractive in real-world applications. We attribute the lack of research interest into this problem to the absence of suitable benchmarks. In this work, we introduce a new large-scale GOT benchmark, LaGOT, containing multiple annotated target objects per sequence. Our benchmark allows users to tackle key remaining challenges in GOT, aiming to increase robustness and reduce computation through joint tracking of multiple objects simultaneously. In addition, we propose a transformer-based GOT tracker baseline capable of joint processing of multiple objects through shared computation. Our approach achieves a 4x faster run-time in case of 10 concurrent objects compared to tracking each object independently and outperforms existing single object trackers on our new benchmark. In addition, our approach achieves highly competitive results on single-object GOT datasets, setting a new state of the art on TrackingNet with a success rate AUC of 84.4%. Our benchmark, code, and trained models will be made publicly available., Comment: accepted by WACV'24

Published
2022

3. AVisT: A Benchmark for Visual Object Tracking in Adverse Visibility

Author

Noman, Mubashir, Ghallabi, Wafa Al, Najiha, Daniya, Mayer, Christoph, Dudhane, Akshay, Danelljan, Martin, Cholakkal, Hisham, Khan, Salman, Van Gool, Luc, and Khan, Fahad Shahbaz

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

One of the key factors behind the recent success in visual tracking is the availability of dedicated benchmarks. While being greatly benefiting to the tracking research, existing benchmarks do not pose the same difficulty as before with recent trackers achieving higher performance mainly due to (i) the introduction of more sophisticated transformers-based methods and (ii) the lack of diverse scenarios with adverse visibility such as, severe weather conditions, camouflage and imaging effects. We introduce AVisT, a dedicated benchmark for visual tracking in diverse scenarios with adverse visibility. AVisT comprises 120 challenging sequences with 80k annotated frames, spanning 18 diverse scenarios broadly grouped into five attributes with 42 object categories. The key contribution of AVisT is diverse and challenging scenarios covering severe weather conditions such as, dense fog, heavy rain and sandstorm; obstruction effects including, fire, sun glare and splashing water; adverse imaging effects such as, low-light; target effects including, small targets and distractor objects along with camouflage. We further benchmark 17 popular and recent trackers on AVisT with detailed analysis of their tracking performance across attributes, demonstrating a big room for improvement in performance. We believe that AVisT can greatly benefit the tracking community by complementing the existing benchmarks, in developing new creative tracking solutions in order to continue pushing the boundaries of the state-of-the-art. Our dataset along with the complete tracking performance evaluation is available at: https://github.com/visionml/pytracking

Published
2022

5. Transforming Model Prediction for Tracking

Author

Mayer, Christoph, Danelljan, Martin, Bhat, Goutam, Paul, Matthieu, Paudel, Danda Pani, Yu, Fisher, and Van Gool, Luc

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

Optimization based tracking methods have been widely successful by integrating a target model prediction module, providing effective global reasoning by minimizing an objective function. While this inductive bias integrates valuable domain knowledge, it limits the expressivity of the tracking network. In this work, we therefore propose a tracker architecture employing a Transformer-based model prediction module. Transformers capture global relations with little inductive bias, allowing it to learn the prediction of more powerful target models. We further extend the model predictor to estimate a second set of weights that are applied for accurate bounding box regression. The resulting tracker relies on training and on test frame information in order to predict all weights transductively. We train the proposed tracker end-to-end and validate its performance by conducting comprehensive experiments on multiple tracking datasets. Our tracker sets a new state of the art on three benchmarks, achieving an AUC of 68.5% on the challenging LaSOT dataset., Comment: Accepted at CVPR 2022. The code and trained models are available at https://github.com/visionml/pytracking

Published
2022

6. Robust Visual Tracking by Segmentation

Author

Paul, Matthieu, Danelljan, Martin, Mayer, Christoph, and Van Gool, Luc

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

Estimating the target extent poses a fundamental challenge in visual object tracking. Typically, trackers are box-centric and fully rely on a bounding box to define the target in the scene. In practice, objects often have complex shapes and are not aligned with the image axis. In these cases, bounding boxes do not provide an accurate description of the target and often contain a majority of background pixels. We propose a segmentation-centric tracking pipeline that not only produces a highly accurate segmentation mask, but also internally works with segmentation masks instead of bounding boxes. Thus, our tracker is able to better learn a target representation that clearly differentiates the target in the scene from background content. In order to achieve the necessary robustness for the challenging tracking scenario, we propose a separate instance localization component that is used to condition the segmentation decoder when producing the output mask. We infer a bounding box from the segmentation mask, validate our tracker on challenging tracking datasets and achieve the new state of the art on LaSOT with a success AUC score of 69.7%. Since most tracking datasets do not contain mask annotations, we cannot use them to evaluate predicted segmentation masks. Instead, we validate our segmentation quality on two popular video object segmentation datasets., Comment: Accepted at ECCV 2022. Code and trained models are available at: https://github.com/visionml/pytracking

Published
2022

9. Learning Target Candidate Association to Keep Track of What Not to Track

Author

Mayer, Christoph, Danelljan, Martin, Paudel, Danda Pani, and Van Gool, Luc

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

The presence of objects that are confusingly similar to the tracked target, poses a fundamental challenge in appearance-based visual tracking. Such distractor objects are easily misclassified as the target itself, leading to eventual tracking failure. While most methods strive to suppress distractors through more powerful appearance models, we take an alternative approach. We propose to keep track of distractor objects in order to continue tracking the target. To this end, we introduce a learned association network, allowing us to propagate the identities of all target candidates from frame-to-frame. To tackle the problem of lacking ground-truth correspondences between distractor objects in visual tracking, we propose a training strategy that combines partial annotations with self-supervision. We conduct comprehensive experimental validation and analysis of our approach on several challenging datasets. Our tracker sets a new state-of-the-art on six benchmarks, achieving an AUC score of 67.1% on LaSOT and a +5.8% absolute gain on the OxUvA long-term dataset., Comment: Accepted at ICCV 2021. The code and trained models are available at https://github.com/visionml/pytracking

Published
2021

10. Group Sparsity: The Hinge Between Filter Pruning and Decomposition for Network Compression

Author

Li, Yawei, Gu, Shuhang, Mayer, Christoph, Van Gool, Luc, and Timofte, Radu

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

In this paper, we analyze two popular network compression techniques, i.e. filter pruning and low-rank decomposition, in a unified sense. By simply changing the way the sparsity regularization is enforced, filter pruning and low-rank decomposition can be derived accordingly. This provides another flexible choice for network compression because the techniques complement each other. For example, in popular network architectures with shortcut connections (e.g. ResNet), filter pruning cannot deal with the last convolutional layer in a ResBlock while the low-rank decomposition methods can. In addition, we propose to compress the whole network jointly instead of in a layer-wise manner. Our approach proves its potential as it compares favorably to the state-of-the-art on several benchmarks., Comment: Accepted by CVPR2020. Code is available at https://github.com/ofsoundof/group_sparsity

Published
2020

11. Efficient Video Semantic Segmentation with Labels Propagation and Refinement

Author

Paul, Matthieu, Mayer, Christoph, Van Gool, Luc, and Timofte, Radu

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

This paper tackles the problem of real-time semantic segmentation of high definition videos using a hybrid GPU / CPU approach. We propose an Efficient Video Segmentation(EVS) pipeline that combines: (i) On the CPU, a very fast optical flow method, that is used to exploit the temporal aspect of the video and propagate semantic information from one frame to the next. It runs in parallel with the GPU. (ii) On the GPU, two Convolutional Neural Networks: A main segmentation network that is used to predict dense semantic labels from scratch, and a Refiner that is designed to improve predictions from previous frames with the help of a fast Inconsistencies Attention Module (IAM). The latter can identify regions that cannot be propagated accurately. We suggest several operating points depending on the desired frame rate and accuracy. Our pipeline achieves accuracy levels competitive to the existing real-time methods for semantic image segmentation(mIoU above 60%), while achieving much higher frame rates. On the popular Cityscapes dataset with high resolution frames (2048 x 1024), the proposed operating points range from 80 to 1000 Hz on a single GPU and CPU., Comment: Accepted at WACV2020

Published
2019

12. Adversarial Feature Distribution Alignment for Semi-Supervised Learning

Author

Mayer, Christoph, Paul, Matthieu, and Timofte, Radu

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

Training deep neural networks with only a few labeled samples can lead to overfitting. This is problematic in semi-supervised learning where only a few labeled samples are available. In this paper, we show that a consequence of overfitting in SSL is feature distribution misalignment between labeled and unlabeled samples. Hence, we propose a new feature distribution alignment method. Our method is particularly effective when using only a small amount of labeled samples. We test our method on CIFAR10 and SVHN. On SVHN we achieve a test error of 3.88% (250 labeled samples) and 3.39% (1000 labeled samples) which is close to the fully supervised model 2.89% (73k labeled samples). In comparison, the current SOTA achieves only 4.29% and 3.74%. Finally, we provide a theoretical insight why feature distribution alignment occurs and show that our method reduces it.

Published
2019

13. Sawfly genomes reveal evolutionary acquisitions that fostered the mega-radiation of parasitoid and eusocial Hymenoptera

Author

Oeyen, Jan Philip, Baa-Puyoulet, Patrice, Benoit, Joshua B, Beukeboom, Leo W, Bornberg-Bauer, Erich, Buttstedt, Anja, Calevro, Federica, Cash, Elizabeth I, Chao, Hsu, Charles, Hubert, Chen, Mei-Ju May, Childers, Christopher, Cridge, Andrew G, Dearden, Peter, Dinh, Huyen, Doddapaneni, Harsha Vardhan, Dolan, Amanda, Donath, Alexander, Dowling, Daniel, Dugan, Shannon, Duncan, Elizabeth, Elpidina, Elena N, Friedrich, Markus, Geuverink, Elzemiek, Gibson, Joshua D, Grath, Sonja, Grimmelikhuijzen, Cornelis JP, Große-Wilde, Ewald, Gudobba, Cameron, Han, Yi, Hansson, Bill S, Hauser, Frank, Hughes, Daniel ST, Ioannidis, Panagiotis, Jacquin-Joly, Emmanuelle, Jennings, Emily C, Jones, Jeffery W, Klasberg, Steffen, Lee, Sandra L, Lesný, Peter, Lovegrove, Mackenzie, Martin, Sebastian, Martynov, Alexander G, Mayer, Christoph, Montagné, Nicolas, Moris, Victoria C, Munoz-Torres, Monica, Murali, Shwetha Canchi, Muzny, Donna M, Oppert, Brenda, Parisot, Nicolas, Pauli, Thomas, Peters, Ralph S, Petersen, Malte, Pick, Christian, Persyn, Emma, Podsiadlowski, Lars, Poelchau, Monica F, Provataris, Panagiotis, Qu, Jiaxin, Reijnders, Maarten JMF, von Reumont, Björn Marcus, Rosendale, Andrew J, Simao, Felipe A, Skelly, John, Sotiropoulos, Alexandros G, Stahl, Aaron L, Sumitani, Megumi, Szuter, Elise M, Tidswell, Olivia, Tsitlakidis, Evangelos, Vedder, Lucia, Waterhouse, Robert M, Werren, John H, Wilbrandt, Jeanne, Worley, Kim C, Yamamoto, Daisuke S, van de Zande, Louis, Zdobnov, Evgeny M, Ziesmann, Tanja, Gibbs, Richard A, Richards, Stephen, Hatakeyama, Masatsugu, Misof, Bernhard, and Niehuis, Oliver

Subjects
Human Genome, Genetics, Life Below Water, Amino Acid Sequence, Animals, Conserved Sequence, DNA Transposable Elements, Female, Gene Dosage, Genetic Speciation, Genome, Insect, Glycoproteins, Herbivory, Host-Parasite Interactions, Hymenoptera, Immunity, Insect Proteins, Male, Multigene Family, Receptors, Odorant, Social Behavior, Vision, Ocular, hexamerin, major royal jelly protein, microsynteny, odorant receptor, opsin, phytophagy, Biochemistry and Cell Biology, Evolutionary Biology, Developmental Biology
Abstract

The tremendous diversity of Hymenoptera is commonly attributed to the evolution of parasitoidism in the last common ancestor of parasitoid sawflies (Orussidae) and wasp-waisted Hymenoptera (Apocrita). However, Apocrita and Orussidae differ dramatically in their species richness, indicating that the diversification of Apocrita was promoted by additional traits. These traits have remained elusive due to a paucity of sawfly genome sequences, in particular those of parasitoid sawflies. Here, we present comparative analyses of draft genomes of the primarily phytophagous sawfly Athalia rosae and the parasitoid sawfly Orussus abietinus. Our analyses revealed that the ancestral hymenopteran genome exhibited traits that were previously considered unique to eusocial Apocrita (e.g., low transposable element content and activity) and a wider gene repertoire than previously thought (e.g., genes for CO2 detection). Moreover, we discovered that Apocrita evolved a significantly larger array of odorant receptors than sawflies, which could be relevant to the remarkable diversification of Apocrita by enabling efficient detection and reliable identification of hosts.

Published
2020

16. Wall teichoic acid substitution with glucose governs phage susceptibility of Staphylococcus epidermidis

Author

Beck, Christian, primary, Krusche, Janes, additional, Notaro, Anna, additional, Walter, Axel, additional, Kränkel, Lara, additional, Vollert, Anneli, additional, Stemmler, Regine, additional, Wittmann, Johannes, additional, Schaller, Martin, additional, Slavetinsky, Christoph, additional, Mayer, Christoph, additional, De Castro, Cristina, additional, and Peschel, Andreas, additional

Published
2024
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17. Adversarial Sampling for Active Learning

Author

Mayer, Christoph and Timofte, Radu

Subjects
Computer Science - Machine Learning, Computer Science - Computer Vision and Pattern Recognition, Statistics - Machine Learning
Abstract

This paper proposes asal, a new GAN based active learning method that generates high entropy samples. Instead of directly annotating the synthetic samples, ASAL searches similar samples from the pool and includes them for training. Hence, the quality of new samples is high and annotations are reliable. To the best of our knowledge, ASAL is the first GAN based AL method applicable to multi-class problems that outperforms random sample selection. Another benefit of ASAL is its small run-time complexity (sub-linear) compared to traditional uncertainty sampling (linear). We present a comprehensive set of experiments on multiple traditional data sets and show that ASAL outperforms similar methods and clearly exceeds the established baseline (random sampling). In the discussion section we analyze in which situations ASAL performs best and why it is sometimes hard to outperform random sample selection., Comment: Accepted at WACV2020

Published
2018

18. Towards Closing the Gap in Weakly Supervised Semantic Segmentation with DCNNs: Combining Local and Global Models

Author

Mayer, Christoph, Timofte, Radu, and Paul, Grégory

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

Generating training sets for deep convolutional neural networks (DCNNs) is a bottleneck for modern real-world applications. This is a demanding task for applications where annotating training data is costly, such as in semantic segmentation. In the literature, there is still a gap between the performance achieved by a network trained on full and on weak annotations. In this paper, we establish a strategy to measure this gap and to identify the ingredients necessary to reduce it. On scribbles, we establish new state-of-the-art results: we obtain a mIoU of 75.6% without, and 75.7% with CRF post-processing. We reduce the gap by 64.2% whereas the current state-of-the-art reduces it only by 57.5%. Thanks to a systematic study of the different ingredients involved in the weakly supervised scenario and an original experimental strategy, we unravel a counter-intuitive mechanism that is simple and amenable to generalisations to other weakly-supervised scenarios: averaging poor local predicted annotations with the baseline ones and reuse them for training a DCNN yields new state-of-the-art results.

Published
2018

20. Chromosome-Level Genome Assembly of the Viviparous Eelpout Zoarces viviparus.

Author

Fuhrmann, Nico, Brasseur, Marie V, Bakowski, Christina E, Podsiadlowski, Lars, Prost, Stefan, Krehenwinkel, Henrik, and Mayer, Christoph

Abstract

The viviparous eelpout Zoarces viviparus is a common fish across the North Atlantic and has successfully colonized habitats across environmental gradients. Due to its wide distribution and predictable phenotypic responses to pollution, Z. viviparus is used as an ideal marine bioindicator organism and has been routinely sampled over decades by several countries to monitor marine environmental health. Additionally, this species is a promising model to study adaptive processes related to environmental change, specifically global warming. Here, we report the chromosome-level genome assembly of Z. viviparus , which has a size of 663 Mb and consists of 607 scaffolds (N50 = 26 Mb). The 24 largest represent the 24 chromosomes of the haploid Z. viviparus genome, which harbors 98% of the complete Benchmarking Universal Single-Copy Orthologues defined for ray-finned fish, indicating that the assembly is highly contiguous and complete. Comparative analyses between the Z. viviparus assembly and the chromosome-level genomes of two other eelpout species revealed a high synteny, but also an accumulation of repetitive elements in the Z. viviparus genome. Our reference genome will be an important resource enabling future in-depth genomic analyses of the effects of environmental change on this important bioindicator species. [ABSTRACT FROM AUTHOR]

Published
2024
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23. The evolution and genomic basis of beetle diversity

Author

McKenna, Duane D., Shin, Seunggwan, Ahrens, Dirk, Balke, Michael, Beza-Beza, Cristian, Clarke, Dave J., Donath, Alexander, Escalona, Hermes E., Friedrich, Frank, Letsch, Harald, Liu, Shanlin, Maddison, David, Mayer, Christoph, Misof, Bernhard, Murin, Peyton J., Niehuis, Oliver, Peters, Ralph S., Podsiadlowski, Lars, Pohl, Hans, Scully, Erin D., Yan, Evgeny V., Zhou, Xin, Ślipiński, Adam, and Beutel, Rolf G.

Published
2019

24. Phylogenomics reveals the evolutionary timing and pattern of butterflies and moths

Author

Kawahara, Akito Y., Plotkin, David, Espeland, Marianne, Meusemann, Karen, Toussaint, Emmanuel F. A., Donath, Alexander, Gimnich, France, Frandsen, Paul B., Zwick, Andreas, dos Reis, Mario, Barber, Jesse R., Peters, Ralph S., Liu, Shanlin, Zhou, Xin, Mayer, Christoph, Podsiadlowski, Lars, Storer, Caroline, Yack, Jayne E., Misof, Bernhard, and Breinholt, Jesse W.

Published
2019

26. Evolutionary genomics of the cold-adapted diatom Fragilariopsis cylindrus.

Author

Mock, Thomas, Otillar, Robert P, Strauss, Jan, McMullan, Mark, Paajanen, Pirita, Schmutz, Jeremy, Salamov, Asaf, Sanges, Remo, Toseland, Andrew, Ward, Ben J, Allen, Andrew E, Dupont, Christopher L, Frickenhaus, Stephan, Maumus, Florian, Veluchamy, Alaguraj, Wu, Taoyang, Barry, Kerrie W, Falciatore, Angela, Ferrante, Maria I, Fortunato, Antonio E, Glöckner, Gernot, Gruber, Ansgar, Hipkin, Rachel, Janech, Michael G, Kroth, Peter G, Leese, Florian, Lindquist, Erika A, Lyon, Barbara R, Martin, Joel, Mayer, Christoph, Parker, Micaela, Quesneville, Hadi, Raymond, James A, Uhlig, Christiane, Valas, Ruben E, Valentin, Klaus U, Worden, Alexandra Z, Armbrust, E Virginia, Clark, Matthew D, Bowler, Chris, Green, Beverley R, Moulton, Vincent, van Oosterhout, Cock, and Grigoriev, Igor V

Subjects
Diatoms, Carbon Dioxide, Iron, Gene Expression Profiling, Genomics, Ice Cover, Acclimatization, Evolution, Molecular, Phylogeny, Recombination, Genetic, Genetic Drift, Alleles, Genome, Darkness, Freezing, Oceans and Seas, Cold Temperature, Transcriptome, Mutation Rate, Evolution, Molecular, Recombination, Genetic, General Science & Technology
Abstract

The Southern Ocean houses a diverse and productive community of organisms. Unicellular eukaryotic diatoms are the main primary producers in this environment, where photosynthesis is limited by low concentrations of dissolved iron and large seasonal fluctuations in light, temperature and the extent of sea ice. How diatoms have adapted to this extreme environment is largely unknown. Here we present insights into the genome evolution of a cold-adapted diatom from the Southern Ocean, Fragilariopsis cylindrus, based on a comparison with temperate diatoms. We find that approximately 24.7 per cent of the diploid F. cylindrus genome consists of genetic loci with alleles that are highly divergent (15.1 megabases of the total genome size of 61.1 megabases). These divergent alleles were differentially expressed across environmental conditions, including darkness, low iron, freezing, elevated temperature and increased CO2. Alleles with the largest ratio of non-synonymous to synonymous nucleotide substitutions also show the most pronounced condition-dependent expression, suggesting a correlation between diversifying selection and allelic differentiation. Divergent alleles may be involved in adaptation to environmental fluctuations in the Southern Ocean.

Published
2017

27. A global, high-resolution data set of ice sheet topography, cavity geometry, and ocean bathymetry

Author

Schaffer, Janin, Timmermann, Ralph, Arndt, Jan Erik, Kristensen, Steen Savstrup, Mayer, Christoph, Morlighem, Mathieu, and Steinhage, Daniel

Subjects
Earth Sciences, Oceanography, Physical Geography and Environmental Geoscience, Geology, Life Below Water, Atmospheric Sciences, Geochemistry, Atmospheric sciences, Geoinformatics, Physical geography and environmental geoscience
Abstract

The ocean plays an important role in modulating the mass balance of the polar ice sheets by interacting with the ice shelves in Antarctica and with the marine-terminating outlet glaciers in Greenland. Given that the flux of warm water onto the continental shelf and into the sub-ice cavities is steered by complex bathymetry, a detailed topography data set is an essential ingredient for models that address ice-ocean interaction.We followed the spirit of the global RTopo-1 data set and compiled consistent maps of global ocean bathymetry, upper and lower ice surface topographies, and global surface height on a spherical grid with now 30 arcsec grid spacing. For this new data set, called RTopo-2, we used the General Bathymetric Chart of the Oceans (GEBCO-2014) as the backbone and added the International Bathymetric Chart of the Arctic Ocean version 3 (IBCAOv3) and the International Bathymetric Chart of the Southern Ocean (IBCSO) version 1. While RTopo-1 primarily aimed at a good and consistent representation of the Antarctic ice sheet, ice shelves, and sub-ice cavities, RTopo-2 now also contains ice topographies of the Greenland ice sheet and outlet glaciers. In particular, we aimed at a good representation of the fjord and shelf bathymetry surrounding the Greenland continent. We modified data from earlier gridded products in the areas of Petermann Glacier, Hagen Bræ, and Sermilik Fjord, assuming that sub-ice and fjord bathymetries roughly follow plausible Last Glacial Maximum ice flow patterns. For the continental shelf off Northeast Greenland and the floating ice tongue of Nioghalvfjerdsfjorden Glacier at about 79° N, we incorporated a high-resolution digital bathymetry model considering original multibeam survey data for the region. Radar data for surface topographies of the floating ice tongues of Nioghalvfjerdsfjorden Glacier and Zachariæ Isstrøm have been obtained from the data centres of Technical University of Denmark (DTU), Operation Icebridge (NASA/NSF), and Alfred Wegener Institute (AWI). For the Antarctic ice sheet/ice shelves, RTopo-2 largely relies on the Bedmap-2 product but applies corrections for the geometry of Getz, Abbot, and Fimbul ice shelf cavities. The data set is available in full and in regional subsets in NetCDF format from the PANGAEA database at doi:10.1594/PANGAEA.856844.

Published
2016

28. Evolutionary history of Polyneoptera and its implications for our understanding of early winged insects

Author

Wipfler, Benjamin, Letsch, Harald, Frandsen, Paul B., Kapli, Paschalia, Mayer, Christoph, Bartel, Daniela, Buckley, Thomas R., Donath, Alexander, Edgerly-Rooks, Janice S., Fujita, Mari, Liu, Shanlin, Machida, Ryuichiro, Mashimo, Yuta, Misof, Bernhard, Niehuis, Oliver, Peters, Ralph S., Petersen, Malte, Podsiadlowski, Lars, Schütte, Kai, Shimizu, Shota, Uchifune, Toshiki, Wilbrandt, Jeanne, Yan, Evgeny, Zhou, Xin, and Simon, Sabrina

Published
2019

30. Phylogenomics and the evolution of hemipteroid insects

Author

Johnson, Kevin P., Dietrich, Christopher H., Friedrich, Frank, Beutel, Rolf G., Wipfler, Benjamin, Peters, Ralph S., Allen, Julie M., Petersen, Malte, Donath, Alexander, Walden, Kimberly K. O., Kozlov, Alexey M., Podsiadlowski, Lars, Mayer, Christoph, Meusemann, Karen, Vasilikopoulos, Alexandros, Waterhouse, Robert M., Cameron, Stephen L., Weirauch, Christiane, Swanson, Daniel R., Percy, Diana M., Hardy, Nate B., Terry, Irene, Liu, Shanlin, Zhou, Xin, Misof, Bernhard, Robertson, Hugh M., and Yoshizawa, Kazunori

Published
2018

32. Regional differentiation and extensive hybridization between mitochondrial clades of the Southern Ocean giant sea spider Colossendeis megalonyx.

Author

Dietz, Lars, Arango, Claudia P, Dömel, Jana S, Halanych, Kenneth M, Harder, Avril M, Held, Christoph, Mahon, Andrew R, Mayer, Christoph, Melzer, Roland R, Rouse, Greg W, Weis, Andrea, Wilson, Nerida G, and Leese, Florian

Subjects
Antarctic, Pycnogonida, benthos, glacial refugia, phylogeography, speciation
Abstract

Assessing the enormous diversity of Southern Ocean benthic species and their evolutionary histories is a central task in the era of global climate change. Based on mitochondrial markers, it was recently suggested that the circumpolar giant sea spider Colossendeis megalonyx comprises a complex of at least six cryptic species with mostly small and non-overlapping distribution ranges. Here, we expand the sampling to include over 500 mitochondrial COI sequences of specimens from around the Antarctic. Using multiple species delimitation approaches, the number of distinct mitochondrial OTUs increased from six to 15-20 with our larger dataset. In contrast to earlier studies, many of these clades show almost circumpolar distributions. Additionally, analysis of the nuclear internal transcribed spacer region for a subset of these specimens showed incongruence between nuclear and mitochondrial results. These mito-nuclear discordances suggest that several of the divergent mitochondrial lineages can hybridize and should not be interpreted as cryptic species. Our results suggest survival of C. megalonyx during Pleistocene glaciations in multiple refugia, some of them probably located on the Antarctic shelf, and emphasize the importance of multi-gene datasets to detect the presence of cryptic species, rather than their inference based on mitochondrial data alone.

Published
2015

33. Lie Algebroid Yang Mills with Matter Fields

Author

Mayer, Christoph and Strobl, Thomas

Subjects
High Energy Physics - Theory, Mathematics - Differential Geometry
Abstract

Lie algebroid Yang-Mills theories are a generalization of Yang-Mills gauge theories, replacing the structural Lie algebra by a Lie algebroid E. In this note we relax the conditions on the fiber metric of E for gauge invariance of the action functional. Coupling to scalar fields requires possibly nonlinear representations of Lie algebroids. In all cases, gauge invariance is seen to lead to a condition of covariant constancy on the respective fiber metric in question with respect to an appropriate Lie algebroid connection. The presentation is kept in part explicit so as to be accessible also to a less mathematically oriented audience., Comment: 24 pages, accepted for publication in J. Geom. Phys

Published
2009
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34. Velocity variations and hydrological drainage at Baltoro Glacier, Pakistan.

Author

Wendleder, Anna, Bramboeck, Jasmin, Izzard, Jamie, Erbertseder, Thilo, d'Angelo, Pablo, Schmitt, Andreas, Quincey, Duncan J., Mayer, Christoph, and Braun, Matthias H.

Subjects
GLACIER speed, GLACIERS, GLOBAL warming, RELATIVE velocity, SNOWMELT, ATMOSPHERIC temperature
Abstract

Glacial meltwater directly influences glacier dynamics. However, in the case of debris-covered glaciers, the drivers of glacier velocity and the influence of supraglacial lakes have not yet been sufficiently analysed and understood. We present a spatio-temporal analysis of key glacier characteristics for Baltoro Glacier in the Karakoram from October 2016 to September 2022 based on Earth observation data and climate parameters extracted from the High Asia Refined analysis (HAR) data set. For the glacier variables, we used surface velocity, supraglacial lake extent, melt of snow and ice, and proglacial run-off index. For climate variables, we focused on air temperature and precipitation. The surface velocity of Baltoro Glacier was characterized by a spring speed-up, summer peak, and fall speed-up with a relative increase in summer of 0.2–0.3 m d -1 (75 %–100 %) in relation to winter velocities, triggered by the onset of or an increase in basal sliding. Snow and ice melt have the largest impact on the spring speed-up, summer velocity peak, and the transition from inefficient to efficient subglacial drainage. The melt covered up to 64 % (353 km 2) of the entirety (debris-covered and debris-free) of Baltoro Glacier and reached up to 4700 m a.s.l. during the first melt peak and up to 5600 m a.s.l. during summer. The temporal delay between the initial peak of seasonal melt and the first relative velocity maximum decreases downglacier. Drainage from supraglacial lakes (3.6–5.9 km 2) contributed to the fall speed-up, which showed a 0.1–0.2 m d -1 (20 %–30 %) lower magnitude compared to the summer velocity peak. Most of the run-off can be attributed to the melt of snow and ice. However, from mid-June onward, the lakes play an increasing role, even though their contribution is estimated to be only about half of that of the melt. The observed increase in summer air temperatures leads to a greater extent of melt, as well as to a rise in the number and total area of supraglacial lakes. This tendency is expected to intensify in a future warming climate. [ABSTRACT FROM AUTHOR]

Published
2024
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35. Solidarität als Thema im Französischunterricht am Beispiel von Simon Boulerices Jugendroman Le dernier qui sort éteint la lumière.

Author

MAYER, CHRISTOPH OLIVER

Subjects
CROSS-cultural studies, BIRTHFATHERS, FRENCH language, CLASSROOMS
Abstract

Copyright of Zeitschrift für Kanada-Studien is the property of Gesellschaft fuer Kanada Studien e.V. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2024

36. Everest South Col Glacier did not thin during the period 1984–2017

Author

Brun, Fanny, primary, King, Owen, additional, Réveillet, Marion, additional, Amory, Charles, additional, Planchot, Anton, additional, Berthier, Etienne, additional, Dehecq, Amaury, additional, Bolch, Tobias, additional, Fourteau, Kévin, additional, Brondex, Julien, additional, Dumont, Marie, additional, Mayer, Christoph, additional, Leinss, Silvan, additional, Hugonnet, Romain, additional, and Wagnon, Patrick, additional

Published
2023
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37. Special geometry of Euclidean supersymmetry II: hypermultiplets and the c-map

Author

Cortes, Vicente, Mayer, Christoph, Mohaupt, Thomas, and Saueressig, Frank

Subjects
High Energy Physics - Theory
Abstract

We construct two new versions of the c-map which allow us to obtain the target manifolds of hypermultiplets in Euclidean theories with rigid N =2 supersymmetry. While the Minkowskian para-c-map is obtained by dimensional reduction of the Minkowskian vector multiplet lagrangian over time, the Euclidean para-c-map corresponds to the dimensional reduction of the Euclidean vector multiplet lagrangian. In both cases the resulting hypermultiplet target spaces are para-hyper-Kahler manifolds. We review and prove the relevant results of para-complex and para-hypercomplex geometry. In particular, we give a second, purely geometrical construction of both c-maps, by proving that the cotangent bundle N=T^*M of any affine special (para-)Kahler manifold M is para-hyper-Kahler., Comment: 36 pages, 1 figure

Published
2005
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38. Domain Walls, Hitchin's Flow Equations and G_2-Manifolds

Author

Mayer, Christoph and Mohaupt, Thomas

Subjects
High Energy Physics - Theory
Abstract

We construct BPS domain wall solutions of the effective action of type-IIA string theory compactified on a half-flat six-manifold. The flow equations for the vector and hypermultiplet scalars are shown to be equivalent to Hitchin's flow equations, implying that our domain walls can be lifted to solutions of ten-dimensional type-IIA supergravity. They take the form R^{1,2} x Y_7, where Y_7 is a G_2-holonomy manifold with boundaries., Comment: 18 pages, v2: minor improvements in presentation, added two references

Published
2004
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39. Space-Time Singularities and the Kahler Cone

Author

Jarv, Laur, Mayer, Christoph, Mohaupt, Thomas, and Saueressig, Frank

Subjects
High Energy Physics - Theory
Abstract

We review recent results on the interplay between the five-dimensional space-time and the internal manifold in Calabi-Yau compactifications of M-theory. Black string, black hole and domain wall solutions as well as Kasner type cosmologies cannot develop a naked singularity as long as the moduli take values inside the Kahler cone., Comment: 8 pages, latex, uses fortschritte.sty, contributed to the proceedings of the 36th International Symposium Ahrenshoop, Berlin, August 26-30, 2003

Published
2003
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40. Special Geometry of Euclidean Supersymmetry I: Vector Multiplets

Author

Cortes, Vicente, Mayer, Christoph, Mohaupt, Thomas, and Saueressig, Frank

Subjects
High Energy Physics - Theory, Mathematics - Differential Geometry
Abstract

We construct the general action for Abelian vector multiplets in rigid 4-dimensional Euclidean (instead of Minkowskian) N=2 supersymmetry, i.e., over space-times with a positive definite instead of a Lorentzian metric. The target manifolds for the scalar fields turn out to be para-complex manifolds endowed with a particular kind of special geometry, which we call affine special para-Kahler geometry. We give a precise definition and develop the mathematical theory of such manifolds. The relation to the affine special Kahler manifolds appearing in Minkowskian N=2 supersymmetry is discussed. Starting from the general 5-dimensional vector multiplet action we consider dimensional reduction over time and space in parallel, providing a dictionary between the resulting Euclidean and Minkowskian theories. Then we reanalyze supersymmetry in four dimensions and find that any (para-)holomorphic prepotential defines a supersymmetric Lagrangian, provided that we add a specific four-fermion term, which cannot be obtained by dimensional reduction. We show that the Euclidean action and supersymmetry transformations, when written in terms of para-holomorphic coordinates, take exactly the same form as their Minkowskian counterparts. The appearance of a para-complex and complex structure in the Euclidean and Minkowskian theory, respectively, is traced back to properties of the underlying R-symmetry groups. Finally, we indicate how our work will be extended to other types of multiplets and to supergravity in the future and explain the relevance of this project for the study of instantons, solitons and cosmological solutions in supergravity and M-theory., Comment: 74 pages

Published
2003
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41. The Kahler Cone as Cosmic Censor

Author

Mayer, Christoph and Mohaupt, Thomas

Subjects
High Energy Physics - Theory
Abstract

M-theory effects prevent five-dimensional domain-wall and black-hole solutions from developing curvature singularities. While so far this analysis was performed for particular models, we now present a model-independent proof that these solutions do not have naked singularities as long as the Kahler moduli take values inside the extended Kahler cone. As a by-product we obtain information on the regularity of the Kahler-cone metric at boundaries of the Kahler cone and derive relations between the geometry of moduli space and space-time., Comment: 21 pages, 1 figure. Improved discussion of the relation between Kahler moduli and five-dimensional scalars. No changes in the conclusions

Published
2003
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42. Pan Genome of the Phytoplankton Emiliania Underpins its Global Distribution

Author

Read, Betsy A., Kegel, Jessica, Klute, Mary J., Kuo, Alan, Lefebvre, Stephane C., Maumus, Florian, Mayer, Christoph, Miller, John, Monier, Adam, Salamov, Asaf, Young, Jeremy, Aguilar, Maria, Claverie, Jean-Michel, Frickenhaus, Stephan, Gonzalez, Karina, Herman, Emily K., lin, Yao-Cheng, Napier, Johnathan, Ogata, Hiroyuki, Sarno, Analissa F., Schmutz, Jeremy, Schroeder, Declan, Vargas, Columban de, Verret, Frederic, Dassow, Peter von, Valentin, Klaus, Peer, Yves Van de, Wheeler, Glen, Dacks, Joel B., Delwiche, Charles F., Dyhrman, Sonya T., Glockner, Gernot, John, Uwe, Richards, Thomas, Worden, Alexandra Z., Zhang, Ziaoyu, and Grigoriev, Igor V.

Abstract

Coccolithophores have influenced the global climate for over 200million years1. These marine phytoplankton can account for 20 percent of total carbon fixation in some systems2. They form bloomsthat can occupy hundreds of thousands of square kilometres andare distinguished by their elegantly sculpted calcium carbonate exoskeletons(coccoliths), rendering themvisible fromspace3.Althoughcoccolithophores export carbon in the form of organic matter andcalcite to the sea floor, they also release CO2 in the calcificationprocess. Hence, they have a complex influence on the carbon cycle,driving either CO2 production or uptake, sequestration and exportto the deep ocean4. Here we report the first haptophyte referencegenome, from the coccolithophore Emiliania huxleyi strainCCMP1516, and sequences from 13 additional isolates. Our analysesreveal a pan genome (core genes plus genes distributed variablybetween strains) probably supported by an atypical complementof repetitive sequence in the genome. Comparisons across strainsdemonstrate thatE. huxleyi, which has long been considered a singlespecies, harbours extensive genome variability reflected in differentmetabolic repertoires. Genome variability within this speciescomplex seems to underpin its capacity both to thrive in habitatsranging from the equator to the subarctic and to form large-scaleepisodic blooms under a wide variety of environmental conditions.

Published
2013

43. Measurement of the low-energy antitriton inelastic cross section

Author

Acharya, Shreyasi, Adamova, Dagmar, Adler, Alexander, Aglieri Rinella, Gianluca, Agnello, Michelangelo, Agrawal, Neelima, Ahammed, Zubayer, Ahmad, Shakeel, Ahn, Sang Un, Ahuja, Ishaan, Akindinov, Alexander, Al-turany, Mohammad, Aleksandrov, Dmitry, Alessandro, Bruno, Alfanda, Haidar Mas'ud, Alfaro Molina, Jose Ruben, Ali, Bushra, Alici, Andrea, Alizadehvandchali, Negin, Alkin, Anton, Alme, Johan, Alocco, Giacomo, Alt, Torsten, Altamura, Anna Rita, Altsybeev, Igor, Anaam, Mustafa, Andrei, Cristian, Andronic, Anton, Anguelov, Venelin, Antinori, Federico, Antonioli, Pietro, Apadula, Nicole, Aphecetche, Laurent Bernard, Appelshaeuser, Harald, Arata, Carolina, Arcelli, Silvia, Aresti, Mauro, Arnaldi, Roberta, Martins Campos Almeida Arneiro, Jhoao Gabriel, Arsene, Ionut Cristian, Arslandok, Mesut, Augustinus, Andre, Averbeck, Ralf Peter, Azmi, Mohd Danish, Baba, Hitoshi, Badala, Angela, Bae, Joonsuk, Baek, Yongwook, Bai, Xiaozhi, Bailhache, Raphaelle Marie, Bailung, Yoshini, Balbino, Alessandro, Baldisseri, Alberto, Balis, Bartosz, Banerjee, Debjani, Banoo, Zarina, Barbera, Roberto, Barile, Francesco, Barioglio, Luca, Barlou, Maria, Barnafoldi, Gergely Gabor, Barnby, Lee Stuart, Ramillien Barret, Valerie, Barreto De Oliveira Campos, Leonardo, Bartels, Clara, Barth, Klaus, Bartsch, Esther, Bastid, Nicole, Basu, Sumit, Batigne, Guillaume, Battistini, Daniel, Batyunya, Boris, Bauri, Dibakar, Bazo Alba, Jose Luis, Bearden, Ian Gardner, Beattie, Caitlin, Becht, Pascal, Behera, Debadatta, Belikov, Iouri, Bell Hechavarria, Ailec, Bellini, Francesca, Bellwied, Rene, Belokurova, Svetlana, Bencedi, Gyula, Beole, Stefania Maria, Bercuci, Alexandru, Berdnikov, Yaroslav, Berdnikova, Anastasia, Bergmann, Luisa, Besoiu, Mihaela Gabriela, Betev, Latchezar, Bhaduri, Partha Pratim, Bhasin, Anju, Bhat, Mohammad Asif, Bhattacharjee, Buddhadeb, Bianchi, Livio, Bianchi, Nicola, Bielcik, Jaroslav, Bielcikova, Jana, Biernat, Jacek Bogumil, Bigot, Alexandre Patrick, Bilandzic, Ante, Biro, Gabor, Biswas, Saikat, Bize, Nicolas Luc, Blair, Justin Thomas, Blau, Dmitry, Blidaru, Mihail Bogdan, Bluhme, Nora, Blume, Christoph, Boca, Gianluigi, Bock, Friederike, Bodova, Tea, Bogdanov, Alexey, Boi, Stefano, Bok, Jeongsu, Boldizsar, Laszlo, Bombara, Marek, Bond, Peter Matthew, Bonomi, Germano, Borel, Herve, Borissov, Alexander, Borquez Carcamo, Andres Gerardo, Bossi, Hannah, Botta, Elena, El Mard Bouziani, Youssef, Bratrud, Lars, Braun-munzinger, Peter, Bregant, Marco, Broz, Michal, Bruno, Giuseppe Eugenio, Buckland, Matthew Daniel, Budnikov, Dmitry, Buesching, Henner, Bufalino, Stefania, Buhler, Paul Alois, Burmasov, Nazar, Buthelezi, Edith Zinhle, Bylinkin, Aleksandr, Bysiak, Sebastian Adam, Cai, Mengke, Caines, Helen Louise, Caliva, Alberto, Calvo Villar, Ernesto, Mejia Camacho, Juan Manuel, Camerini, Paolo, De Moraes Canedo, Fabio, Carabas, Mihai, Amatriain Carballo, Aitor, Carnesecchi, Francesca, Caron, Robin Albert Andre, Abranches De Carvalho, Leopoldo, Castillo Castellanos, Javier Ernesto, Catalano, Fabio, Ceballos Sanchez, Cesar, Chakaberia, Irakli, Chakraborty, Pritam, Chandra, Sinjini, Chapeland, Sylvain, Chartier, Marielle, Chattopadhyay, Subhasis, Chattopadhyay, Sukalyan, Garcia Chavez, Tonatiuh, Cheng, Tiantian, Cheshkov, Cvetan Valeriev, Cheynis, Brigitte, Chibante Barroso, Vasco Miguel, Dobrigkeit Chinellato, David, Chizzali, Emma Sophia, Cho, Jaeyoon, Cho, Soyeon, Chochula, Peter, Christakoglou, Panagiotis, Christensen, Christian Holm, Christiansen, Peter, Chujo, Tatsuya, Ciacco, Mario, Cicalo, Corrado, Cindolo, Federico, Ciupek, Michael Rudolf, Clai, Giulia, Colamaria, Fabio Filippo, Colburn, Jonathan Samuel, Colella, Domenico, Colocci, Manuel, Concas, Matteo, Conesa Balbastre, Gustavo, Conesa Del Valle, Zaida, Contin, Giacomo, Contreras Nuno, Jesus Guillermo, Coquet, Maurice Louis, Cortese, Pietro, Cosentino, Mauro Rogerio, Costa, Filippo, Costanza, Susanna, Cot, Corentin, Crkovska, Jana, Crochet, Philippe, Cruz Torres, Reynier, Cui, Pengyao, Dainese, Andrea, Danisch, Meike Charlotte, Danu, Andrea, Das, Prottay, Das, Prottoy, Das, Supriya, Dash, Archita Rani, Dash, Sadhana, Regules Medel, Hector David, De Caro, Annalisa, De Cataldo, Giacinto, De Cuveland, Jan, De Falco, Alessandro, De Gruttola, Daniele, De Marco, Nora, De Martin, Chiara, De Pasquale, Salvatore, Deb, Rohaan, Deb, Suman, Del Grande, Raffaele, Dello Stritto, Luigi, Deng, Wenjing, Dhankher, Preeti, Di Bari, Domenico, Di Mauro, Antonio, Diab, Batoul, Arteche Diaz, Raul, Dietel, Thomas, Ding, Yanchun, Divia, Roberto, Dixit, Dhruv Utpalkumar, Djuvsland, Oeystein, Dmitrieva, Uliana, Dobrin, Alexandru Florin, Donigus, Benjamin, Dubinski, Jan Michal, Dubla, Andrea, Dudi, Sandeep, Dupieux, Pascal, Durkac, Martin, Dzalaiova, Natalia, Eder, Tabea Maria, Ehlers, Raymond James, III, Eisenhut, Florian, Ejima, Ren, Elia, Domenico, Erazmus, Barbara Ewa, Ercolessi, Francesca, Erhardt, Filip, Ersdal, Magnus Rentsch, Espagnon, Bruno, Eulisse, Giulio, Evans, David, Evdokimov, Sergey, Fabbietti, Laura, Faggin, Mattia, Faivre, Julien, Fan, Feng, Fan, Wenqing, Fantoni, Alessandra, Fasel, Markus, Fecchio, Pietro, Feliciello, Alessandro, Feofilov, Grigorii, Fernandez Tellez, Arturo, Ferrandi De Oliveira, Lucas, Bertran Ferrer, Marta, Ferrero, Andrea, Ferrero, Chiara, Ferretti, Alessandro, Feuillard, Victor Jose Gaston, Filova, Vendulka, Finogeev, Dmitry, Fionda, Fiorella, Flor, Fernando Antonio, Flores, Amanda Nicole, Foertsch, Siegfried Valentin, Fokin, Ilya, Fokin, Sergey, Fragiacomo, Enrico, Frajna, Eszter, Fuchs, Ulrich, Funicello, Nicola, Furget, Christophe, Furs, Artur, Fusayasu, Takahiro, Gaardhoeje, Jens Joergen, Gagliardi, Martino, Gago Medina, Alberto Martin, Gahlaut, Tanu, Duarte Galvan, Carlos, Gangadharan, Dhevan Raja, Ganoti, Paraskevi, Garabatos Cuadrado, Jose Maria, Tavira Garcia, Andrea, Alvarado Garcia, Jesus Ricardo, Garcia-solis, Edmundo Javier, Gargiulo, Corrado, Demmich, Katharina, Gasik, Piotr Jan, Gautam, Amrit, De Leone Gay, Maria Beatriz, Germain, Marie, Ghimouz, Abderrahmane, Ghosh, Chandrasekhar, Giacalone, Marco, Giubellino, Paolo, Giubilato, Piero, Glaenzer, Aude Marie Camille, Glassel, Peter, Glimos, Ewa, Goh, Daniel Jia Qin, Gonzalez Sebastian, Victor Luis, Gorgon, Marek Boguslaw, Goswami, Kangkan, Gotovac, Sven, Grabski, Varlen, Graczykowski, Lukasz Kamil, Grecka, Ekaterina, Grelli, Alessandro, Grigoras, Costin, Grigoryev, Vladislav, Grigoryan, Smbat, Grosa, Fabrizio, Grosse-oetringhaus, Jan Fiete, Grosso, Raffaele, Grund, David, Garcia Guardiano, Gabriel, Guernane, Rachid, Guilbaud, Maxime Rene Joseph, Gulbrandsen, Kristjan Herlache, Gundem, Tuba, Gunji, Taku, Guo, Wenda, Gupta, Anik, Gupta, Ramni, Gupta, Rashi, Paisano Guzman, Sergio, Gwizdziel, Katarzyna, Gyulai, Laszlo, Habib, Michael Karim, Hadjidakis, Cynthia Marie, Haider, Fakhar Ul, Hamagaki, Hideki, Hamdi, Abdennacer, Han, Younghoon, Hanley, Brian Gerald, Hannigan, Ryan Patrick, Hansen, Joachim, Haque, Md Rihan, Harris, John William, Harton, Austin Vincent, Hassan, Hadi, Hatzifotiadou, Despina, Hauer, Philip, Havener, Laura Brittany, Heckel, Stefan Thomas, Hellbar, Ernst, Helstrup, Haavard, Hemmer, Marvin, Herman, Tomas, Herrera Corral, Gerardo Antonio, Herrmann, Florian, Herrmann, Sarah Nina Edwige, Hetland, Kristin Fanebust, Heybeck, Benedict, Hillemanns, Hartmut, Hippolyte, Boris, Hoffmann, Felix Willi, Hofman, Bas, Hong, Geun Hee, Horst, Maximilian, Horzyk, Adrian, Hou, Yongzhen, Hristov, Peter Zahariev, Hughes, Charles, Huhn, Patrick, Huhta, Laura Maria, Humanic, Thomas, Hutson, Alek, Hutter, Dirk, Ilkaev, Radiy, Ilyas, Hira, Inaba, Motoi, Innocenti, Gian Michele, Ippolitov, Mikhail, Isakov, Artem, Isidori, Tommaso, Islam, Md Samsul, Ivanov, Marian, Ivanov, Vladimir, Iversen, Kaare Endrup, Jablonski, Miroslaw, Jacak, Barbara, Jacazio, Nicolo, Jacobs, Peter Martin, Jadlovska, Slavka, Jadlovsky, Jan, Jaelani, Syaefudin, Jahnke, Cristiane, Jakubowska, Monika Joanna, Janik, Malgorzata Anna, Janson, Thomas, Jercic, Marko, Ji, Su-jeong, Jia, Shihai, Paz Jimenez, Alom Antonio, Jonas, Florian, Jones, Daniel Matthew, Jowett, John, Jung, Jerome, Jung, Michael, Junique, Antoine Jean-simon, Jusko, Anton, Kabus, Maja Jadwiga, Kaewjai, Jetnipit, Kalinak, Peter, Kalteyer, Annalena Sophie, Kalweit, Alexander Philipp, Kaplin, Vladimir, Karasu Uysal, Ayben, Karatovic, David, Karavichev, Oleg, Karavicheva, Tatiana, Karczmarczyk, Przemyslaw, Karpechev, Evgeny, Kebschull, Udo Wolfgang, Keidel, Ralf, Keijdener, Darius, Keil, Markus, Ketzer, Bernhard Franz, Khade, Swapnesh Santosh, Khan, Ahsan Mehmood, Khan, Shaista, Khanzadeev, Alexei, Kharlov, Yury, Khatun, Anisa, Khuntia, Arvind, Kidson, Miles Brower, Kileng, Bjarte, Kim, Beomkyu, Kim, Chong, Kim, Dong Jo, Kim, Eun Joo, Kim, Jaehyun, Kim, Jinsook, Kim, Jiyoung, Kim, Junlee, Kim, Minjung, Kim, Se Yong, Kim, Taejun, Kimura, Kento, Kirsch, Stefan, Kisel, Ivan, Kiselev, Sergey, Kisiel, Adam Ryszard, Kitowski, Jacek Pawel, Klay, Jennifer Lynn, Klein, Jochen, Klein, Spencer Robert, Klein-boesing, Christian, Kleiner, Matthias, Klemenz, Thomas, Kluge, Alexander, Knospe, Anders Garritt, Kobdaj, Chinorat, Kollegger, Thorsten Sven, Kondratyev, Andrey, Kondratyeva, Natalia, Kondratyuk, Evgeny, Konig, Joshua Leon, Konigstorfer, Stephan Alexander, Konopka, Piotr Jan, Kornakov Van, Georgui, Koryciak, Sebastian Dominik, Kotliarov, Artem, Kovalenko, Vladimir, Kowalski, Marek, Kozhuharov, Venelin Valeriev, Kralik, Ivan, Kravcakova, Adela, Krcal, Lubos, Krivda, Marian, Krizek, Filip, Krizkova Gajdosova, Katarina, Kroesen, Martin, Kruger, Mario, Krupova, Diana Maria, Kryshen, Evgeny, Kucera, Vit, Kuhn, Christian Claude, Kuijer, Paulus Gerardus, Kumaoka, Takuya, Kumar, Deekshit, Kumar, Lokesh, Kumar, Navneet, Kumar, Shyam, Kundu, Sourav, Kurashvili, Podist, Kurepin, Alexander, Kurepin, Alexey, Kuryakin, Alexey, Kushpil, Svetlana, Kweon, Min Jung, Kwon, Youngil, La Pointe, Sarah Louise, La Rocca, Paola, Lakrathok, Anantachai, Lamanna, Massimo, Langoy, Rune, Larionov, Pavel, Laudi, Elisa, Lautner, Lukas, Lavicka, Roman, Lea, Ramona, Lee, Hyungjun, Legrand, Iosif-charles, Legras, Gauthier, Lehrbach, Johannes, Lelek, Tomasz Marcin, Lemmon, Roy Crawford, Leon Monzon, Ildefonso, Lesch, Marcel Markus, Lesser, Ezra Douglas, Levai, Peter, Li, Xiaomei, Li, Xing Long, Lien, Jorgen Andre, Lietava, Roman, Likmeta, Iris, Lim, Bong-hwi, Lim, Sanghoon, Lindenstruth, Volker, Lindner, Amelia, Lippmann, Christian, Liu, Alwina Ruixin, Liu, Donghai, Liu, Jian, Setoue Liveraro, Gianni Shigeru, Lofnes, Ingrid Mckibben, Loizides, Constantinos, Lokos, Sandor, Lomker, Johanna, Loncar, Petra, Lopez Lopez, Jorge Andres, Lopez, Xavier Bernard, Lopez Torres, Ernesto, Lu, Pengzhong, Luhder, Jens Robert, Lunardon, Marcello, Luparello, Grazia, Ma, Yugang, Mager, Magnus, Maire, Antonin, Makariev, Martin Vasilev, Malaev, Mikhail, Malfattore, Giovanni, Malik, Nasir Mehdi, Malik, Qasim Waheed, Malik, Salman Khurshid, Malinina, Liudmila, Mallick, Dukhishyam, Mallick, Neelkamal, Mandaglio, Giuseppe, Mandal, Sushobhan Kumar, Manko, Vladislav, Manso, Franck, Manzari, Vito, Mao, Yaxian, Marcjan, Robert Waclaw, Margagliotti, Giacomo Vito, Margotti, Anselmo, Marin, Ana Maria, Markert, Christina, Martinengo, Paolo, Martinez Hernandez, Mario Ivan, Martinez-garcia, Gines, Martins Palhares, Maria Paula, Masciocchi, Silvia, Masera, Massimo, Masoni, Alberto, Massacrier, Laure Marie, Mastroserio, Annalisa, Matonoha, Oliver, Mattiazzo, Serena, Toledo Matuoka, Paula Fernanda, Matyja, Adam Tomasz, Mayer, Christoph, Lafuente Mazuecos, Antonio, Mazzaschi, Francesco, Mazzilli, Marianna, Mdhluli, Joyful Elma, Mechler, Adrian Florin, Melikyan, Yury, Menchaca-rocha, Arturo Alejandro, Meninno, Elisa, Sasikumar Menon, Anjaly, Meres, Michal, Mhlanga, Sibaliso, Miake, Yasuo, Micheletti, Luca, Migliorin, Lucrezia Camilla, Mihaylov, Dimitar Lubomirov, Mikhaylov, Konstantin, Mishra, Aditya Nath, Miskowiec, Dariusz Czeslaw, Modak, Abhi, Mohanty, Auro Prasad, Mohanty, Bedangadas, Khan, Mohammed Mohisin, Molander, Mikael Andreas, Monira, Shirajum, Moravcova, Zuzana, Mordasini, Cindy, Moreira De Godoy, Denise Aparecida, Morozov, Igor, Morsch, Andreas, Mrnjavac, Teo, Muccifora, Valeria, Muhuri, Sanjib, Mulligan, James Declan, Mulliri, Alice, Gameiro Munhoz, Marcelo, Munzer, Robert Helmut, Murakami, Hikari, Murray, Sean, Musa, Luciano, Musinsky, Jan, Myrcha, Julian Wojciech, Naik, Bharati, Nambrath, Anjali Ila, Nandi, Basanta Kumar, Nania, Rosario, Nappi, Eugenio, Nassirpour, Adrian Fereydon, Nath, Abhishek, Nattrass, Christine, Naydenov, Momchil Nikolaev, Neagu, Alexandra, Negru, Adrian-eduard, Nellen, Lukas, Nepeivoda, Roman, Nese, Sigurd, Neskovic, Gvozden, Nielsen, Borge Svane, Nielsen, Emil Gorm, Nikolaev, Sergey, Nikulin, Sergey, Nikulin, Vladimir, Noferini, Francesco, Noh, Seoyoung, Nomokonov, Petr, Norman, Jaime, Novitzky, Norbert, Nowakowski, Piotr, Nyanin, Alexander, Nystrand, Joakim Ingemar, Ogino, Masanori, Oh, Saehanseul, Ohlson, Alice Elisabeth, Okorokov, Vitaly, Oleniacz, Janusz, Oliveira Da Silva, Antonio Carlos, Oliver, Michael Henry, Onnerstad, Anna, Oppedisano, Chiara, Ortiz Velasquez, Antonio, Otwinowski, Jacek Tomasz, Oya, Motomi, Oyama, Ken, Pachmayer, Yvonne Chiara, Padhan, Sonali, Pagano, Davide, Paic, Guy, Palasciano, Antonio, Panebianco, Stefano, Park, Hanseo, Park, Hyebin, Park, Jonghan, Parkkila, Jasper Elias, Patley, Yash, Patra, Rajendra Nath, Paul, Biswarup, Pei, Hua, Peitzmann, Thomas, Peng, Xinye, Pennisi, Michele, Peresunko, Dmitry Yurevich, Mesa Perez, Guillermo, Pestov, Yury, Petrov, Vitalii, Petrovici, Mihai, Peretti Pezzi, Rafael, Piano, Stefano, Pikna, Miroslav, Pillot, Philippe, Pinazza, Ombretta, Pinsky, Lawrence, Pinto, Chiara, Pisano, Silvia, Ploskon, Mateusz Andrzej, Planinic, Mirko, Pliquett, Fabian, Poghosyan, Martin, Polishchuk, Boris, Politano, Stefano, Poljak, Nikola, Pop, Amalia, Porteboeuf, Sarah Julie, Pozdniakov, Valeriy, Yoval Pozos, Irandheny, Pradhan, Kshitish Kumar, Prasad, 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Kuzu, Serpil, Yamaguchi, Yorito, Yang, Shiming, Yano, Satoshi, Yin, Zhongbao, Yoo, In Kwon, Yoon, Jin Hee, Yu, Hyeonjin, Yuan, Shiming, Yuncu, Alperen, Zaccolo, Valentina, Zampolli, Chiara, Zanone, Federica, Zardoshti, Nima, Zarochentsev, Andrey, Zavada, Petr, Zavyalov, Nikolay, Zhalov, Mikhail, Zhang, Biao, Zhang, Chi, Zhang, Liuyao, Zhang, Song, Zhang, Xiaoming, Zhang, Yifei, Zhang, Zhen, Zhao, Mingrui, Zherebchevskii, Vladimir, Yu, Zhi, Zhou, Daicui, Zhou, You, Zhu, Jianhui, Zhu, Ya, Zugravel, Stefan Cristi, Zurlo, Nicola, Laboratoire de Physique de Clermont (LPC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne (UCA), Laboratoire de physique subatomique et des technologies associées (SUBATECH), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-IMT Atlantique (IMT Atlantique), Institut Mines-Télécom [Paris] (IMT)-Institut Mines-Télécom [Paris] (IMT)-Nantes université - UFR des Sciences et des Techniques (Nantes univ - UFR ST), Nantes Université - pôle Sciences et technologie, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ)-Nantes Université - pôle Sciences et technologie, Nantes Université (Nantes Univ)-Nantes Université (Nantes Univ), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and ALICE

Subjects
isospin, dependence, nucleus, interaction, nucleon, FOS: Physical sciences, GeV, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], antinucleus, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), ALICE, propagation, GEANT, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], TeV, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

In this Letter, the first measurement of the inelastic cross section for antitriton$-$nucleus interactions is reported, covering the momentum range of $0.8 \leq p < 2.4$ GeV/$c$. The measurement is carried out using data recorded with the ALICE detector in pp and Pb$-$Pb collisions at a centre-of-mass energy per nucleon of 13 TeV and 5.02 TeV, respectively. The detector material serves as an absorber for antitriton nuclei. The raw yield of (anti)triton nuclei measured with the ALICE apparatus is compared to the results from detailed ALICE simulations based on the GEANT4 toolkit for the propagation of (anti)particles through matter, allowing one to quantify the inelastic interaction probability in the detector material. This analysis complements the measurement of the inelastic cross section of antinuclei up to $A=3$ carried out by the ALICE Collaboration, and demonstrates the feasibility of the study of the isospin dependence of inelastic interaction cross section with the analysis techniques presented in this Letter., 20 pages, 2 captioned figures, authors from page 14, submitted to PLB, figures at http://alice-publications.web.cern.ch/node/9480

Published
2023

44. Towards a third-order topological invariant for magnetic fields

Author

Hornig, Gunnar and Mayer, Christoph

Subjects
Physics - Plasma Physics
Abstract

An expression for a third-order link integral of three magnetic fields is presented. It is a topological invariant and therefore an invariant of ideal magnetohydrodynamics. The integral generalizes existing expressions for third-order invariants which are obtained from the Massey triple product, where the three fields are restricted to isolated flux tubes. The derivation and interpretation of the invariant shows a close relationship with the well-known magnetic helicity, which is a second-order topological invariant. Using gauge fields with an SU(2) symmetry, helicity and the new third-order invariant originate from the same identity, an identity which relates the second Chern class and the Chern-Simons three-form. We present an explicit example of three magnetic fields with non-disjunct support. These fields, derived from a vacuum Yang-Mills field with a non-vanishing winding number, possess a third-order linkage detected by our invariant., Comment: 14 pages, 6 figures

Published
2002
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46. Correction to: An integrative phylogenomic approach to elucidate the evolutionary history and divergence times of Neuropterida (Insecta: Holometabola)

Author

Vasilikopoulos, Alexandros, Misof, Bernhard, Meusemann, Karen, Lieberz, Doria, Flouri, Tomáš, Beutel, Rolf G., Niehuis, Oliver, Wappler, Torsten, Rust, Jes, Peters, Ralph S., Donath, Alexander, Podsiadlowski, Lars, Mayer, Christoph, Bartel, Daniela, Böhm, Alexander, Liu, Shanlin, Kapli, Paschalia, Greve, Carola, Jepson, James E., Liu, Xingyue, Zhou, Xin, Aspöck, Horst, and Aspöck, Ulrike

Published
2020
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