cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
On particle Gibbs sampling
Creators: name: Chopin, Nicolas
name: Singh, Sumeetpal S.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Computation (stat.CO)
subject: FOS: Computer and information sciences

description: The particle Gibbs sampler is a Markov chain Monte Carlo (MCMC) algorithm to sample from the full posterior distribution of a state-space model. It does so by executing Gibbs sampling steps on an extended target distribution defined on the space of the auxiliary variables generated by an interacting particle system. This paper makes the following contributions to the theoretical study of this algorithm. Firstly, we present a coupling construction between two particle Gibbs updates from different starting points and we show that the coupling probability may be made arbitrarily close to one by increasing the number of particles. We obtain as a direct corollary that the particle Gibbs kernel is uniformly ergodic. Secondly, we show how the inclusion of an additional Gibbs sampling step that reselects the ancestors of the particle Gibbs' extended target distribution, which is a popular approach in practice to improve mixing, does indeed yield a theoretically more efficient algorithm as measured by the asymptotic variance. Thirdly, we extend particle Gibbs to work with lower variance resampling schemes. A detailed numerical study is provided to demonstrate the efficiency of particle Gibbs and the proposed variants.
description: Published at http://dx.doi.org/10.3150/14-BEJ629 in the Bernoulli (http://isi.cbs.nl/bernoulli/) by the International Statistical Institute/Bernoulli Society (http://isi.cbs.nl/BS/bshome.htm)
Interview with Larissa Balkissoon, KLR Essay Prize Competition Winner 2021
Creators: name: Ghezelayagh, Shaghayegh
name: Lennox, Amber
name: Manjarekar, Paarth
Publisher: name: Kent Law Review
Year: 2021

description: Interview with Larissa Balkissoon, KLR Essay Prize Competition Winner 2021.
description: Kent Law Review, Vol 6 No 1 (2021): Kent Law Review
Lower bounds for the modified Szpiro ratio
Creators: name: Barrios, Alexander J.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Number Theory (math.NT)
subject: FOS: Mathematics
subject: 11G05, 11D75, 11J25

description: Let $E/\mathbb{Q}$ be an elliptic curve. The modified Szpiro ratio of $E$ is the quantity $σ_{m}(E) =\log\max\left\{ \left\vert c_{4}^{3}\right\vert ,c_{6}^{2}\right\} /\log N_{E}$ where $c_{4}$ and $c_{6}$ are the invariants associated to a global minimal model of $E$, and $N_{E}$ denotes the conductor of $E$. In this article, we show that for each of the fifteen torsion subgroups $T$ allowed by Mazur's Torsion Theorem, there is a rational number $l_{T}$ such that if $T\hookrightarrow E(\mathbb{Q}) _{\text{tors}}$, then $σ_{m}(E) >l_{T}$. We also show that this bound is sharp.
description: 15 pages; incorporates referee's suggestions; sharpness of lower bounds is no longer conditional on the abc conjecture; final version to appear in Acta Arithmetica
Weak equilibria for time-inconsistent control: with applications to investment-withdrawal decisions
Creators: name: Liang, Zongxia
name: Yuan, Fengyi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Optimization and Control (math.OC)
subject: Mathematical Finance (q-fin.MF)
subject: FOS: Mathematics
subject: FOS: Economics and business
subject: 60G40, 91A40, 91G80, 93E20

description: This paper considers time-inconsistent problems when control and stopping strategies are required to be made simultaneously (called stopping control problems by us). We first formulate the timeinconsistent stopping control problems under general multi-dimensional controlled diffusion model and propose a formal definition of their equilibria. We show that an admissible pair $(\hat{u},C)$ of controlstopping policy is equilibrium if and only if the auxiliary function associated with it solves the extended HJB system, providing a methodology to verify or exclude equilibrium solutions. We provide several examples to illustrate applications to mathematical finance and control theory. For a problem whose reward function endogenously depends on the current wealth, the equilibrium is explicitly obtained. For another model with a non-exponential discount, we prove that any constant proportion strategy can not be equilibrium. We further show that general non-constant equilibrium exists and is described by singular boundary value problems. This example shows that considering our combined problems is essentially different from investigating them separately. In the end, we also provide a two-dimensional example with a hyperbolic discount.
Importance des virus en milieu lacustre
Creators: name: Duhamel, Solange
name: Personnic, Sébastien
name: Jacquet, Stéphan
Publisher: name: Columbia University
Year: 2005
Subjects: Biogeochemistry
Freshwater microbiology
Freshwater ecology
Viruses
Bacteria
Protista

description: L’écologie virale aquatique est une science relativement jeune, 15 ans, et jusqu’à très récem- ment, l’impact des virus n’était pas pris en compte dans la régulation des peuplements micro- biens pour laquelle seuls la disponibilité des ressources nutritives et les processus d’origine biotique, comme la prédation et la compétition, étaient considérés comme prépondérants.
Estimating the number of communities in weighted networks
Creators: name: Qing, Huan
Publisher: name: arXiv
Year: 2022
Subjects: subject: Social and Information Networks (cs.SI)
subject: Data Analysis, Statistics and Probability (physics.data-an)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: Community detection in weighted networks has been a popular topic in recent years. However, while there exist several flexible methods for estimating communities in weighted networks, these methods usually assume that the number of communities is known. It is usually unclear how to determine the exact number of communities one should use. Here, to estimate the number of communities for weighted networks generated from arbitrary distribution under the degree-corrected distribution-free model, we propose one approach that combines weighted modularity with spectral clustering. This approach allows a weighted network to have negative edge weights and it also works for signed networks. We compare the proposed method to several existing methods and show that our method is more accurate for estimating the number of communities both numerically and empirically.
Das Alltägliche erobern: Die Filme der Lettristen und die französische Nachkriegs-Avantgarde, 1946–1954 / S’emparer du quotidien: films lettristes et avant-garde française de l’après-guerre, 1946– 1954
Creators: name: Sarvé-Tarr, Marin
Publisher: name: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel
Year: 2016

description: -
description: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel, Jahresbericht / Rapport annuel 2014/2015
Poly-Omic Prediction of Complex Traits: OmicKriging
Creators: name: Wheeler, Heather E.
name: Aquino-Michaels, Keston
name: Gamazon, Eric R.
name: Trubetskoy, Vassily V.
name: Dolan, M. Eileen
name: Huang, R. Stephanie
name: Cox, Nancy J.
name: Im, Hae Kyung
Publisher: name: arXiv
Year: 2013
Subjects: subject: Applications (stat.AP)
subject: Genomics (q-bio.GN)
subject: Quantitative Methods (q-bio.QM)
subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences
subject: FOS: Biological sciences

description: High-confidence prediction of complex traits such as disease risk or drug response is an ultimate goal of personalized medicine. Although genome-wide association studies have discovered thousands of well-replicated polymorphisms associated with a broad spectrum of complex traits, the combined predictive power of these associations for any given trait is generally too low to be of clinical relevance. We propose a novel systems approach to complex trait prediction, which leverages and integrates similarity in genetic, transcriptomic or other omics-level data. We translate the omic similarity into phenotypic similarity using a method called Kriging, commonly used in geostatistics and machine learning. Our method called OmicKriging emphasizes the use of a wide variety of systems-level data, such as those increasingly made available by comprehensive surveys of the genome, transcriptome and epigenome, for complex trait prediction. Furthermore, our OmicKriging framework allows easy integration of prior information on the function of subsets of omics-level data from heterogeneous sources without the sometimes heavy computational burden of Bayesian approaches. Using seven disease datasets from the Wellcome Trust Case Control Consortium (WTCCC), we show that OmicKriging allows simple integration of sparse and highly polygenic components yielding comparable performance at a fraction of the computing time of a recently published Bayesian sparse linear mixed model method. Using a cellular growth phenotype, we show that integrating mRNA and microRNA expression data substantially increases performance over either dataset alone. We also integrate genotype and expression data to predict change in LDL cholesterol levels after statin treatment and show that OmicKriging performs better than the polygenic score method. We provide an R package to implement OmicKriging.
Bibliothek / Bibliothèque
Creators: name: Redaktion, Die
Publisher: name: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel
Year: 2016

description: -
description: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel, Jahresbericht / Rapport annuel 2014/2015
Development and evaluation of an Explainable Prediction Model for Chronic Kidney Disease Patients based on Ensemble Trees
Creators: name: Moreno-Sanchez, Pedro A.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: FOS: Computer and information sciences

description: Chronic Kidney Disease (CKD), where delayed recognition implies premature mortality, is currently experiencing a globally increasing incidence and high cost to health systems. Data mining allows discovering subtle patterns in CKD indicators to contribute to an early diagnosis. This work presents the development and evaluation of an explainable prediction model that would support clinicians in the early diagnosis of CKD patients. The model development is based on a data management pipeline that detects the best combination of ensemble trees algorithms and features selected concerning classification performance. Furthermore, the main contribution of the paper involves an explainability-driven approach that allows selecting the best predictive model maintaining a balance between accuracy and explainability. Therefore, the most balanced explainable predictive model implements an extreme gradient boosting classifier over 3 features (packed cell value, specific gravity, and hypertension), achieving an accuracy of 99.2% and 97.5% with cross-validation technique and with new unseen data respectively. In addition, an analysis of the model's explainability shows that the packed cell value is the most relevant feature that influences the prediction results of the model, followed by specific gravity and hypertension. This small number of feature selected results in a reduced cost of the early diagnosis of CKD implying a promising solution for developing countries.
Methods to study splicing from high-throughput RNA Sequencing data
Creators: name: Alamancos, Gael P.
name: Agirre, Eneritz
name: Eyras, Eduardo
Publisher: name: arXiv
Year: 2013
Subjects: subject: Genomics (q-bio.GN)
subject: FOS: Biological sciences

description: The development of novel high-throughput sequencing (HTS) methods for RNA (RNA-Seq) has provided a very powerful mean to study splicing under multiple conditions at unprecedented depth. However, the complexity of the information to be analyzed has turned this into a challenging task. In the last few years, a plethora of tools have been developed, allowing researchers to process RNA-Seq data to study the expression of isoforms and splicing events, and their relative changes under different conditions. We provide an overview of the methods available to study splicing from short RNA-Seq data. We group the methods according to the different questions they address: 1) Assignment of the sequencing reads to their likely gene of origin. This is addressed by methods that map reads to the genome and/or to the available gene annotations. 2) Recovering the sequence of splicing events and isoforms. This is addressed by transcript reconstruction and de novo assembly methods. 3) Quantification of events and isoforms. Either after reconstructing transcripts or using an annotation, many methods estimate the expression level or the relative usage of isoforms and/or events. 4) Providing an isoform or event view of differential splicing or expression. These include methods that compare relative event/isoform abundance or isoform expression across two or more conditions. 5) Visualizing splicing regulation. Various tools facilitate the visualization of the RNA-Seq data in the context of alternative splicing. In this review, we do not describe the specific mathematical models behind each method. Our aim is rather to provide an overview that could serve as an entry point for users who need to decide on a suitable tool for a specific analysis. We also attempt to propose a classification of the tools according to the operations they do, to facilitate the comparison and choice of methods.
description: 31 pages, 1 figure, 9 tables. Small corrections added
Digital humanities / Humanités numériques
Creators: name: Redaktion, Die
Publisher: name: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel
Year: 2016

description: -
description: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel, Jahresbericht / Rapport annuel 2014/2015
Charles O'Hegarty
Creators: name: (:Unav)
Publisher: name: Columbia University
Year: 2019

description: Charles O'Hegarty performs live and is interviewed by Bob Fass at the WBAI studio. Parts 2-3: Charles O'Hegarty performs "Mother's Lament." Rhythmic drum music plays. "Green, Green Rocky Road" plays. "I Found A Love" by The Falcons plays. "La Marseillaise" plays. Part 5: Bob interviews Charles O'Hegarty, folk singer formerly in the Greenwood County Singers. They discuss singing in groups and the perceived animosity between the Irish and English (O'Hegarty is from England). Parts 6-7: Bob plays some records, Charles O'Hegarty plays more live music and speaks with Bob. Part unspecified (23 minutes): Charles O'Hegarty plays various folk songs, including, "The Handsome Cabin Boy," "Cushie Butterfield," "Mother's Lament," "Shoals of Herring," "The Leaving of Liverpool," "Bridget Flynn," "What a Mouth," and "Play With Fire"
Interview with Prof LJB Hayes, Head of Kent Law School
Creators: name: Ghezelayagh, Shaghayegh
name: Guy, Hannah
name: Lennox, Amber
name: Manjarekar, Paarth
Publisher: name: Kent Law Review
Year: 2021

description: Interview with Professor LJB Hayes, Head of Kent Law School.
description: Kent Law Review, Vol 6 No 1 (2021): Kent Law Review
Decoding the riddle of Y(4260) and $Z_c(3900)$
Creators: name: Wang, Qian
name: Hanhart, Christoph
name: Zhao, Qiang
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Nuclear Experiment (nucl-ex)
subject: Nuclear Theory (nucl-th)
subject: FOS: Physical sciences

description: The observation of $Z_c(3900)$ by the BESIII collaboration in the invariant mass spectrum of $J/ψπ^\pm$ in $e^+e^-\to J/ψπ^+π^-$ at the center of mass 4.260 GeV suggests the existence of a charged $\bar D D^*+D\bar D^*$ molecular state with $I(J^P)=1(1^+)$, which could be an isovector brother of the famous X(3872) and an analogue of $Z_b(10610)$ claimed by the Belle Collaboration. We demonstrate that this observation provides strong evidence that the mysterious Y(4260) is a $\bar{D}D_1(2420) +D\bar{D}_1(2420)$ molecular state. Especially, we show that the decay of this molecule naturally populates low momentum $\bar DD^*$ pairs and leads unavoidably to a cusp at the $\bar DD^*$ threshold. We discuss the signatures that distinguish such a $\bar DD^*$ cusp from the presence of a true resonance.
description: Version to appear in Phys. Rev. Letters
Flow cytometric analysis of bacteria- and virus-like particles in lake sediments
Creators: name: Duhamel, Solange
name: Jacquet, Stéphan
Publisher: name: Columbia University
Year: 2006
Subjects: Biogeochemistry
Freshwater ecology
Viruses
Bacteria
Lake sediments
Flow cytometry

description: Flow cytometry (FCM) was successfully used to analyze freshwater bacteria and viruses in lake sediments after relatively simple sample treatment and optimization of dilution/fixation/staining procedures. Biological particles from Lakes Geneva and Bourget were first separated from the sediments by using both Sodium Pyrophosphate (0.01 M final concentration) and Polyoxyethylene-Sorbitan Monooleate (10% final concentration) and sonicating for 3 min in a water bath. The best results (based on FCM signature and the highest virus and bacterial yields from the sediments) were obtained by formaldehyde fixation carried out within less than one hour (2% final concentration, vs. no fixation or using glutaraldehyde at different concentrations), SYBR-Green II staining (×1 / 20,000 stock solution concentration, vs. use of SYBR-Gold and SYBR-Green I dyes at different concentrations). There was a considerable loss of particles after only a few days of storage at either 4 or − 22 °C. For FCM analysis, the samples were diluted in Tris–EDTA buffer (pH 8) and heated for 10 min at 75 °C after incubating for 5 min in the dark. The bacterial and viral counts paralleled those obtained using epifluorescence microscopy (EFM), but EFM always gave lower counts than FCM. Analysis of the distribution of the viruses in the water column and in the sediments of Lakes Bourget revealed a marked gradient, with larger quantities in the top layer of the sediment than in the water above it. These results are discussed, as well as the possible novel application of flow cytometry in the study of aquatic viral ecology.
Supplemental Information from Fundamental bound on epidemic overshoot in the SIR model
Creators: name: Nguyen, Maximilian M.
name: Freedman, Ari S.
name: Ozbay, Sinan A.
name: Levin, Simon A.
Publisher: name: The Royal Society
Year: 2023
Subjects: classificationCode: 310299
subject: Bioinformatics and computational biology not elsewhere classified
classificationCode: 490102
subject: Biological mathematics

description: Text and figures for Supplemental Information.
Quantum Limits on Localizing Point Objects against a Uniformly Bright Disk
Creators: name: Prasad, Sudhakar
Publisher: name: arXiv
Year: 2022
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We calculate the quantum Fisher information (QFI) for estimating, using a circular imaging aperture, the two-dimensional location of a point source against a uniformly bright disk of known center and radius in the ideal photon-counting limit. We present both a perturbative calculation of the QFI in powers of the background-to-source brightness ratio and a numerically exact calculation of the QFI in the eigen-basis of the one-photon density operator. A related problem of the quantum limit on estimating the location of a small-area brightness hole in an otherwise uniformly bright disk, a problem of potential interest to the extrasolar planet detection community, is also treated perturbatively in powers of the ratio of the areas of the hole and the background disk. We then numerically evaluate the Cramer-Rao lower bound (CRB) for wavefront projections in three separate bases, those comprised of Zernike, Fourier-Bessel and localized point-source modes, for unbiased estimation of the two position coordinates of the point source and of the brightness hole center, respectively, for the two problems. By comparing these CRBs with the corresponding quantum-limited minimum error variances, given by inverting the QFI matrix, and with the CRBs associated with direct imaging, we assess the maximum efficiency of these wavefront projections in performing such estimations.
description: Accepted for publication in Physical Review A
Vorträge der Wissenschaftlerinnen und Wissenschaftler / Conférences des chercheurs
Creators: name: Redaktion, Die
Publisher: name: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel
Year: 2016

description: -
description: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel, Jahresbericht / Rapport annuel 2014/2015
A high-luminosity superconducting twin $e^+e^-$ linear collider with energy recovery
Creators: name: Telnov, V. I.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Accelerator Physics (physics.acc-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Superconducting technology makes it possible to build a high energy $e^+e^-$ linear collider with energy recovery (ERLC) and reusable beams. To avoid parasitic collisions inside the linacs, a twin (dual) LC is proposed. In this article, I consider the principle scheme of the collider and estimate the achievable luminosity, which is limited by collision effects and available power. Such a collider can operate in a duty cycle (DC) and in a continuous (CW) modes, if sufficient power. With current SC Nb technology ($T=1.8$ K, $f_{\rm RF}=1.3$ GHz, used for ILC) and with power $P= 100$ MW, a luminosity $L \sim 0.33 \times10^{36}\,\rm cm^{-2}s^{-1}$ is possible at the Higgs factory with $2E_0=250$ GeV. Using superconductors operating at 4.5 K with high $Q_0$ values, such as Nb$_3$Sn, and $f_{\rm RF}=0.65$ GHz, the luminosity can reach $L \sim 1.4 \times10^{36} \,\rm cm^{-2}s^{-1}$ at $2E_0=250$ GeV (with P=100 MW) and $L \sim 0.8 \times 10^{36}\,\rm cm^{-2}s^{-1}$ at $2E_0=500$ GeV (with P=150 MW), which is almost two orders of magnitude greater than at the ILC, where the beams are used only once. This technology requires additional efforts to obtain the required parameters and reliably operation. Such a collider would be the best machine for precision Higgs studies, including the measurement of Higgs self-coupling.
description: Talk presented at the International Workshop on Future Linear Colliders (LCWS2021), 15-18 March 2021. C21-03-15.1
Supersymmetrizing the Pasti-Sorokin-Tonin action
Creators: name: Kozyrev, Nikolay
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: In this paper the harmonic superspace action of the tensor multiplet of $N=(1,0)$, $d=6$ supersymmetry is constructed which in the bosonic limit reduces to the known Pasti-Sorokin-Tonin action for the self-dual tensor field. The action involves, besides the potential containing the dynamical fields, also an auxiliary tensor multiplet and a set of analytic superfields with gauge PST scalar among them. For each of gauge symmetries of the PST action, a superfield analog is found. The equations of motion are calculated and it is shown in the bosonic limit that no extra degrees of freedom appear.
description: 17 pages, 0 figures
Reisen und Fachexkursionen / Séjours d’études
Creators: name: Redaktion, Die
Publisher: name: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel
Year: 2017

description: -
description: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel, Jahresbericht / Rapport annuel 2015/2016
Four-loop large-n_f contributions to the non-singlet structure functions F_2 and F_L
Creators: name: Basdew-Sharma, A.
name: Pelloni, A.
name: Herzog, Franz
name: Vogt, A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We have calculated the n_f^2 and n_f^3 contributions to the flavour non-singlet structure functions F_2 and F_L in inclusive deep-inelastic scattering at the fourth order in the strong coupling alpha_s. The coefficient functions have been obtained by computing a very large number of Mellin-N moments using the method of differential equations, and then determining the analytic forms in N and Bjorken-x from these. Our new n_f^2 terms are numerically much larger than the n_f^3 leading large-nf parts which were already known; they agree with predictions of the threshold and high-energy resummations. Furthermore our calculation confirms the earlier determination of the four-loop n_f^2 part of the corresponding anomalous dimension. Via the no-pi^2 conjecture/theorem for Euclidean physical quantities, we predict the z4 n_f^3 part of the fifth-order anomalous dimension for the evolution of non-singlet quark distributions.
description: 48 pages, LaTex, 5 eps-based figures. Analytical results in ancillary FORM files
Low-Temperature Hopping Dynamics with Energy Disorder: Renormalization Group Approach
Creators: name: Velizhanin, Kirill A.
name: Piryatinski, Andrei
name: Chernyak, Vladimir Y.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We formulate a real-space renormalization group (RG) approach for efficient numerical analysis of the low-temperature hopping dynamics in energy-disordered lattices. The approach explicitly relies on the time-scale separation of the trapping/escape dynamics. This time-scale separation allows to treat the hopping dynamics as a hierarchal process, an RG step being a transformation between the levels of the hierarchy. We apply the proposed RG approach to analyze hopping dynamics in one- and two-dimensional lattices with varying degree of energy disorder, and find the approach to be more accurate at low temperatures and computationally much faster, than the direct diagonalization. Applicability criteria of the proposed approach with respect to the time-scale separation and the maximum number of hierarchy levels are formulated. RG flows of energy distribution and preexponents of the Miller-Abrahams model are analyzed.
Assessing the microbial community dynamics and the role of bacteriophages in bacterial mortality in Lake Geneva
Creators: name: Duhamel, Solange
name: Domaizon-Pialat, Isabelle
name: Personnic, Sébastien
name: Jacquet, Stéphan
Publisher: name: Columbia University
Year: 2006
Subjects: Biogeochemistry
Freshwater microbiology
Freshwater plankton--Ecology
Protista
Viruses
Heterotrophic bacteria

description: The aims of this work were to study, for the first time, the succession of microbial communities (from viruses to ciliates) in the largest occidental European lake (Lake Geneva) and to perform two one-week in situ experiments in March-April (Exp1) and May (Exp2) 2004 in order to assess both small flagellate protozoan and virus-induced mortality of heterotrophic bacteria. Both nanoflagellates and viruses could be responsible for 31 to 42% of the total daily mortality of heterotrophic bacteria. In May (Exp2), viruses could explain up to 10% of the bacterial mortality whereas flagellates were responsible for 32% of the bacterioplankton removal. These results provide new evidence for the critical role played by viruses in the functioning of the microbial food webs and highlight the importance of further considering this biological compartment for a better understanding of the plankton ecology of Lake Geneva.
title: Το πλανητικό οικολογικό πρόβλημα και η αντιμετώπισή του
Creators: name: Ψαραύτη Ιωάννα
Publisher: name: Technical University of Crete
Year: 2012

description: φ. 1: Μορφές και αιτίες υποβάθμισης του περιβάλλοντος και η πλανητική οικολογική κρίση -- Κεφ. 2: Η ανασυγκρότηση του παγκόσμιου καπιταλισμού και ο ρόλος του κράτους και των διεθνών οργανισμών-- Κεφ. 3: Οι προσπάθειες και οι θεσμικοί μηχανισμοί για την αντιμετώπιση του ζητήματος -- Κεφ. 4: Διεθνείς και ενωσιακές ρυθμίσεις για την κλιματική αλλαγή
title: Συνέργια δομικών (CeO2, La2O3) και επιφανειακών (K) ενισχυτών  κατά την καταλυτική διάσπαση του N2O σε μονολιθικούς καταλύτες Pt/Al2O3
Creators: name: Αλυγίζου Φιλία
Publisher: name: Technical University of Crete
Year: 2012

description: φ.1: Εισαγωγή -- Κεφ.2: Υποξείδιο του αζώτου (N2O): πηγές εκπομπής και επιπτώσεις -- Κεφ.3: Επίδραση δομικών και επιφανειακών ενισχυτών στην διάσπαση του N2O
Environment-induced anisotropy and the sensitivity of the radical pair mechanism in the avian compass
Creators: name: Carrillo, Alejandro
name: Cornelio, Marcio F.
name: de Oliveira, Marcos C.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Biological Physics (physics.bio-ph)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Several experiments over the years have shown that the Earth's magnetic field is essential for orientation in birds migration. The most promising explanation for this orientation is the photo-stimulated radical pair (RP) mechanism. In order to define a reference frame for the orientation task radicals must have an intrinsic anisotropy. We show that this kind of anisotropy, and consequently the entanglement in the model, are not necessary for the proper functioning of the compass. Classically correlated initial conditions for the RP, subjected to a fast decoherence process, are able to provide the anisotropy required. Even a dephasing environment can provide the necessary frame for the compass to work, and also implies fast decay of any quantum correlation in the system without damaging the orientation ability. This fact significantly expands the range of applicability of the RP mechanism providing more elements for experimental search.
description: 7 pages, 6 figures. Replaced with final published version
Stellar Escape from Globular Clusters. I. Escape Mechanisms and Properties at Ejection
Creators: name: Weatherford, Newlin C.
name: Kıroğlu, Fulya
name: Fragione, Giacomo
name: Chatterjee, Sourav
name: Kremer, Kyle
name: Rasio, Frederic A.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The theory of stellar escape from globular clusters (GCs) dates back nearly a century, especially the gradual evaporation of GCs via two-body relaxation coupled with external tides. More violent ejection can also occur via strong gravitational scattering, supernovae, gravitational wave-driven mergers, tidal disruption events, and physical collisions, but comprehensive study of the many escape mechanisms has been limited. Recent exquisite kinematic data from the Gaia space telescope has revealed numerous stellar streams in the Milky Way (MW) and traced the origin of many to specific MWGCs, highlighting the need for further examination of stellar escape from these clusters. In this study, the first of a series, we lay the groundwork for detailed follow-up comparisons between Cluster Monte Carlo (CMC) GC models and the latest Gaia data on the outskirts of MWGCs, their tidal tails, and associated streams. We thoroughly review escape mechanisms from GCs and examine their relative contributions to the escape rate, ejection velocities, and escaper demographics. We show for the first time that three-body binary formation may dominate high-speed ejection from typical MWGCs, potentially explaining some of the hypervelocity stars in the MW. Due to their mass, black holes strongly catalyze this process, and their loss at the onset of observable core collapse, characterized by a steep central brightness profile, dramatically curtails three-body binary formation, despite the increased post-collapse density. We also demonstrate that even when born from a thermal eccentricity distribution, escaping binaries have significantly nonthermal eccentricities consistent with the roughly uniform distribution observed in the Galactic field.
description: 28 pages, 6 figures, 4 tables, accepted to ApJ
Eindrücke und Erfahrungen der Stipendiatinnen und Stipendiaten / La parole aux boursiers
Creators: name: Redaktion, Die
Publisher: name: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel
Year: 2017

description: -
description: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel, Jahresbericht / Rapport annuel 2015/2016
Forschungsprojekte / Les projets de recherche
Creators: name: Redaktion, Die
Publisher: name: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel
Year: 2017

description: -
description: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel, Jahresbericht / Rapport annuel 2015/2016
An Epimorphism between Fine and Ferguson's Matrices for Angell's AC
Creators: name: Zach, Richard
Publisher: name: arXiv
Year: 2021
Subjects: subject: Logic (math.LO)
subject: FOS: Mathematics
subject: 03B47 (Primary), 03B50 (Primary), 03-08 (Secondary), 08-08 (Secondary)

description: Angell's logic of analytic containment AC has been shown to be characterized by a 9-valued matrix NC by Ferguson, and by a 16-valued matrix by Fine. It is shown that the former is the image of a surjective homomorphism from the latter, i.e., an epimorphic image. Some candidate 7-valued matrices are ruled out as characteristic of AC. Whether matrices with fewer than 9 values exist remains an open question. The results were obtained with the help of the MUltlog system for investigating finite-valued logics; the results serve as an example of the usefulness of techniques from computational algebra in logic. A tableau proof system for NC is also provided.
Quantum Energy Inequality for the Massive Ising Model
Creators: name: Bostelmann, Henning
name: Cadamuro, Daniela
name: Fewster, Christopher J.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences
subject: 81T40

description: A Quantum Energy Inequality (QEI) is derived for the massive Ising model, giving a state-independent lower bound on suitable averages of the energy density; the first QEI to be established for an interacting quantum field theory with nontrivial S-matrix. It is shown that the Ising model has one-particle states with locally negative energy densities, and that the energy density operator is not additive with respect to combination of one-particle states into multi-particle configurations.
description: Slightly extended version, as published in Phys. Rev. D; 6 pages, 2 figures
Veranstaltungen / Manifestations
Creators: name: Redaktion, Die
Publisher: name: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel
Year: 2017

description: -
description: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel, Jahresbericht / Rapport annuel 2015/2016
From spin liquid to magnetic ordering in the anisotropic kagome Y-Kapellasite Y3Cu9(OH)19Cl8: a single crystal study
Creators: name: Chatterjee, D.
name: Puphal, P.
name: Barthélemy, Q.
name: Willwater, J.
name: Süllow, S.
name: Baines, C.
name: Petit, S.
name: Ressouche, E.
name: Ollivier, J.
name: Zoch, K. M.
name: Krellner, C.
name: Parzer, M.
name: Riss, A.
name: Garmroudi, F.
name: Pustogow, A.
name: Mendels, P.
name: Kermarrec, E.
name: Bert, F.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: Y3Cu9(OH)19Cl8 realizes an original anisotropic kagome model hosting a rich magnetic phase diagram [M. Hering et al, npj Computational Materials 8, 1 (2022)]. We present an improved synthesis of large phase-pure single crystals via an external gradient method. These crystals were investigated in details by susceptibility, specific heat, thermal expansion, neutron scattering and local muSR and NMR techniques. At variance with polycristalline samples, the study of single crystals gives evidence for subtle structural instabilities at 33K and 13K which preserve the global symmetry of the system and thus the magnetic model. At 2.1K the compound shows a magnetic transition to a coplanar (1/3,1/3) long range order as predicted theoretically. However our analysis of the spin wave excitations yields magnetic interactions which locate the compound closer to the phase boundary to a classical jammed spin liquid phase. Enhanced quantum fluctuations at this boundary may be responsible for the strongly reduced ordered moment of the Cu2+, estimated to be 0.075muB from muSR.
Les virus planctoniques : un compartiment biologique clé des milieux aquatiques
Creators: name: Personnic, Sébastien
name: Duhamel, Solange
name: Bettarel, Yvan
name: Sime-Ngando, Télesphore
name: Jacquet, Stéphan
Publisher: name: Columbia University
Year: 2006
Subjects: Biogeochemistry
Marine microbiology
Marine ecology
Viruses

description: Les virus constituent l’entité biologique la plus a bondante dans les écosystèmes aquatiques. Ce sont, on le sait, des parasites obligatoires capables d’infecter potentiellement toutes les cellules vivantes (de la cellule humaine à la bactérie) et l’on reconnaît aujourd’hui que les conséquences de leurs activités sur la structure et le fonctionnement des écosystèmes aquatiques sont considérables. Les virus interviennent dans de nombreux processus écologiques et biogéochimiques, tels que le recyclage des nutriments, la mortalité bactérienne et algale, et affectent également la diversité de l’ensemble du compartiment microbien de manière directe ou indirecte. Cet article a pour but de dresser l’état des connaissances de l’écologie des virus planctoniques, acquises au cours des 15 dernières années avec le développement d’outils méthodologiques toujours plus performants.
title: Επιστημονικοί υπολογισμοί σε επεξεργαστές γραφικών υποσυστημάτων πολλαπλών πυρήνων για την αριθμητική μέθοδο πεπερασμένων στοιχείων Hermite Collocation
Creators: name: Αθανασάκης Ιωάννης
Publisher: name: Technical University of Crete
Year: 2012

description:  Τεχνικές αποθήκευσης αραιών πινάκων και βασικές πράξεις γραμμικής άλγεβρας -- 2. Τεχνικές πολυπλέγματος -- 3. Αριθμητική επίλυση ΠΣΤ με τη μέθοδο Hermite Collocation -- 4. Παράλληλος προγραμματισμός σε κάρτες γραφικών-GPUs -- 5. Υλοποίηση και μελέτη της συμπεριφοράς του αλγορίθμου
title: Υλοποίηση κβαντικών αλγορίθμων αναζήτησης σε κοιλότητες κβαντικής ηλεκτροδυναμικής
Creators: name: Καλογεράκης Μιχαήλ
Publisher: name: Technical University of Crete
Year: 2013

description:  Κβαντική ηλεκτροδυναμική σε κοιλότητες -- 2. Κβαντικοί αλγόριθμοι και κβαντική υπολογιστική -- 3. Υλοποίηση αλγορίθμων σε συστήματα Cavity QED -- 4. Υλοποίηση κβαντικών πυλών σε συστοιχίες συζευγμένων κοιλοτήτων
title: Ανάλυση ιχνοστοιχείων σε ατμοσφαιρικά κατακρημνίσματα (fall-out) της περιοχής Χανίων
Creators: name: Κονιδιτσιώτης Αναστάσιος
Publisher: name: Technical University of Crete
Year: 2012

description: φ. 1: Ατμόσφαιρα -- Κεφ. 2: Αιωρούμενα σωματίδια -- Κεφ. 3: Αιωρούμενα σωματίδια στα Χανιά
Bericht über die transregionale Akademie, São Paulo, 16.-24. Juli 2016 / Compte rendu de l’académie transrégionale, São Paulo, 16-24 juillet 2016
Creators: name: Bader, Lena
name: Kirchner, Thomas
Publisher: name: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel
Year: 2017

description: -
description: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel, Jahresbericht / Rapport annuel 2015/2016
title: Αξιολόγηση πρότασης αποκατάστασης διατηρητέου κτίσματος στα Ταμπακαριά Χανίων μέσω στατικής και ιδιομορφικής ανάλυσης του δομικού συστήματος
Creators: name: Ρελιας Γεωργιος
Publisher: name: Technical University of Crete
Year: 2013

description:  Συντήρηση και αποκατάσταση ιστορικών κτιρίων και συνόλων από φέρουσα τοιχοποιία -- 2: Διάγνωση βλαβών σε υφιστάμενα κτίρια και μέθοδοι αντιμετώπισης-- 3: Το νησί, η πόλη, η ονομασία -- 4: Υφιστάμενη κατάσταση κτιρίου-Αποθήκη 17 -- 5: Πεπερασμένα στοιχεία
AGN proximity zone fossils and the delayed recombination of metal lines
Creators: name: Oppenheimer, Benjamin D.
name: Schaye, Joop
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We model the time-dependent evolution of metal-enriched intergalactic and circumgalactic gas exposed to the fluctuating radiation field from an active galactic nucleus (AGN). We consider diffuse gas densities (n_H=10^-5-10^-3 cm^-3) exposed to the extra-galactic background (EGB) and initially in thermal equilibrium (T \sim 10^4-10^4.5 K). Once the proximate AGN field turns on, additional photo-ionisation rapidly ionises the HI and metals. The enhanced AGN radiation field turns off after a typical AGN lifetime (tau_AGN=1-20 Myr) and the field returns to the EGB intensity, but the metals remain out of ionisation equilibrium for timescales that can significantly exceed tau_AGN. We define this phase as the AGN proximity zone "fossil" phase and show that high ionisation stages (e.g. OVI, NeVIII, MgX) are in general enhanced, while the abundances of low ions are reduced. In contrast, HI re-equilibrates rapidly (<
description: Accepted in MNRAS, 18 pages, 9 figures
Wissenschaftlicher Beirat / Conseil scientifique
Creators: name: Redaktion, Die
Publisher: name: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel
Year: 2017

description: -
description: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel, Jahresbericht / Rapport annuel 2015/2016
title: Φως
Creators: name: Μαρκάκη Ζαχαρένια
Publisher: name: Technical University of Crete
Year: 2013

description: Κεφ. 1: Βιογραφία του φωτός μέσα από τα μεγαλιθικά έργα της αρχαιότητας -- Κεφ. 2: Το φως των μεγαλιθικών μνημείων του 21ου αιώνα -- Κεφ. 3: Δημιουργία και παρατήρηση ενός νέου ήλιου στα μεγαλιθικά μνημεία του 21ου αιώνα -- Κεφ. 4: Εφαρμογές αιχμής του 21ου αιώνα με γνώμονα τα μεγαλιθικά μνημεία της αρχαιότητας
Hydrodynamic magneto-transport in holographic charge density wave states
Creators: name: Amoretti, Andrea
name: Arean, Daniel
name: Brattan, Daniel K.
name: Martinoia, Luca
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: We employ hydrodynamics and gauge/gravity to study magneto-transport in phases of matter where translations are broken (pseudo-)spontaneously. First we provide a hydrodynamic description of systems where translations are broken homogeneously at nonzero lattice pressure and magnetic field. This allows us to determine analytic expressions for all the relevant transport coefficients. Next we construct holographic models of those phases and determine all the DC conductivities in terms of the dual black hole geometry. Combining the hydrodynamic and holographic descriptions we obtain analytic expression for the AC thermo-electric correlators. These are fixed in terms of the black hole geometry and a pinning frequency we determine numerically. We find an excellent agreement between our hydrodynamic and holographic descriptions and show that the holographic models are good avatars for the study of magneto-phonons.
description: 33 pages, 3 figures
A dual-labeling method for the simultaneous measurement of dissolved inorganic carbon and phosphate uptake by marine planktonic species
Creators: name: Duhamel, Solange
name: Zeman, Florence
name: Moutin, Thierry
Publisher: name: Columbia University
Year: 2006
Subjects: Biogeochemistry
Biogeochemistry--Technique
Marine microbiology
Marine plankton
Carbon cycle (Biogeochemistry)
Phosphorus cycle (Biogeochemistry)

description: The measurement of primary production is the foundation for aquatic biogeochemistry research. The biogeochemical cycles of phosphate (P) and other biolimiting elements are tightly linked to marine primary production. We have optimized an existing method of carbon (C) and P dual isotope labeling to study the simultaneous C and P uptake by plankton species in marine environments. The two main objectives of this study were (1) to test the preservation properties of the labeled samples and the calculation methods used in separating the signals of the different radionuclides, and (2) to adapt the method to marine environments. The procedure was successfully implemented in contrasting locations within the southeast Pacific (between 146.36°W and 72.49°W). The uptake rates determined using this method ranged from 14 to 900 nM h⁻¹ for dissolved inorganic C and from 0.03 to 4.5 nM h⁻¹ for dissolved inorganic P in surface water. The detection limit found in ultraoligotrophic surface water was 3.33 nM h⁻¹ and 0.01 nM h⁻¹ for C and P, respectively. C and P assimilation fluxes in low‐ and high‐productivity open‐ocean systems may be studied using this sensitive method. We outline a protocol for marine environments that is appropriate for use under oceanographic cruise conditions. Results from the application of this method will lead to a better understanding of the interplay between carbon and phosphate biogeochemical cycles in the upper ocean.
title: Aufbereitete Abwässer: Bakterielle Krankheitserreger auf frischem Obst und Gemüse vermeiden: Stellungnahme Nr. 021/2020 des BfR vom 20. April 2020
Creators: name: Bundesinstitut Für Risikobewertung
Publisher: name: Bundesbehörden und Einrichtungen im Geschäftsbereich des Bundesministeriums für Ernährung und Landwirtschaft (BMEL)
Year: 2020
Subjects: subject: 000

description: BfR-Stellungnahmen, vol. 2020, no. 021
Veranstaltungskalender / Calendrier des activités
Creators: name: Redaktion, Die
Publisher: name: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel
Year: 2017

description: -
description: Deutsches Forum für Kunstgeschichte (DFK Paris): Jahresbericht / Rapport annuel, Jahresbericht / Rapport annuel 2015/2016
0D-2D Heterostructure for making very Large Quantum Registers using itinerant Bose-Einstein Condensate of Excitons
Creators: name: Bhunia, Amit
name: Singh, Mohit Kumar
name: Huwayz, Maryam Al
name: Henini, Mohamed
name: Datta, Shouvik
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Gases (cond-mat.quant-gas)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Presence of coherent resonant tunneling in quantum dot (zero-dimensional) - quantum well (two-dimensional) heterostructure is necessary to explain the collective oscillations of average electrical polarization of excitonic dipoles over a macroscopically large area. This was measured using photo excited capacitance as a function of applied voltage bias. Resonant tunneling in this heterostructure definitely requires momentum space narrowing of charge carriers inside the quantum well and that of associated indirect excitons, which indicates bias dependent itinerant Bose-Einstein condensation of excitons. Observation of periodic variations in negative quantum capacitance points to in-plane coulomb correlations mediated by long range spatial ordering of indirect, dipolar excitons. Enhanced contrast of quantum interference beats of excitonic polarization waves even under white light and observed Rabi oscillations over a macroscopically large area also support the presence of density driven excitonic condensation having long range order. Periodic presence (absence) of splitting of excitonic peaks in photocapacitance spectra even demonstrate collective coupling (decoupling) between energy levels of the quantum well and quantum dots with applied biases, which can potentially be used for quantum gate operations. All these observations point to experimental control of macroscopically large, quantum state of a two-component Bose-Einstein condensate of excitons in this quantum dot - quantum well heterostructure. Therefore, in principle, millions of two-level excitonic qubits can be intertwined to fabricate large quantum registers using such hybrid heterostructure by controlling the local electric fields and also by varying photoexcitation intensities of overlapping light spots.
description: 53 pages, Manuscript + 14 Figures