cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Maxmaxflow and counting subgraphs
Creators: name: Jackson, Bill
name: Sokal, Alan D.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Combinatorics (math.CO)
subject: Mathematical Physics (math-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences
subject: 05C99 (Primary), 05C15, 05C30, 05C35, 05C40, 82B20, 90B10 (Secondary)

description: We introduce a new graph invariant Λ(G) that we call maxmaxflow, and put it in the context of some other well-known graph invariants, notably maximum degree and its relatives. We prove the equivalence of two "dual" definitions of maxmaxflow: one in terms of flows, the other in terms of cocycle bases. We then show how to bound the total number (or more generally, total weight) of various classes of subgraphs of G in terms of either maximum degree or maxmaxflow. Our results are motivated by a conjecture that the modulus of the roots of the chromatic polynomial of G can be bounded above by a function of Λ(G).
description: Latex2e, 47 pages (includes 2 figures). Version 2 makes some small changes: the introduction is expanded to Sections 1 and 2; and an error in Corollaries 8.5 and 8.12 (formerly called 7.5 and 7.12) is corrected
Unanswerable Questions about Images and Texts
Creators: name: Davis, Ernest
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Artificial Intelligence (cs.AI)
subject: Computation and Language (cs.CL)
subject: FOS: Computer and information sciences

description: Questions about a text or an image that cannot be answered raise distinctive issues for an AI. This note discusses the problem of unanswerable questions in VQA (visual question answering), in QA (visual question answering), and in AI generally.
description: 15 pages, 4 figures
Realization of Woodpile Structure Using Optical Interference Holography
Creators: name: Pang, Yee Kwong
name: Lee, Jeffrey Chi Wai
name: Ho, Cheuk Ting
name: Tam, Wing Yim
Publisher: name: arXiv
Year: 2006
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: We report the use of a (4+1)-beam optical interference holography technique to fabricate woodpile structures in photo-resists. The configuration consists of 4 linear polarized side beams arranged symmetrically around a circular polarized central beam with all the beams from the same half space, making it easily accessible experimentally. The fabricated woodpile structures are in good agreement with model simulations. Furthermore, woodpiles with the diamond symmetry are also obtained by exploiting the deformations of the photo-resists. Directional bandgaps in the visible range are also observed for the samples with and without the correct stacking of the woodpile structures.
description: 9 pages and three figures
Branching Formula for $q$-Toda Function of Type B
Creators: name: Hoshino, Ayumu
name: Ohkubo, Yusuke
name: Shiraishi, Jun'ichi
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Algebra (math.QA)
subject: Mathematical Physics (math-ph)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We present a proof of the explicit formula for the asymptotically free eigenfunctions of the $B_N$ $q$-Toda operator which was conjectured by the first and third authors. This formula can be regarded as a branching formula from the $B_N$ $q$-Toda eigenfunction restricted to the $A_{N-1}$ $q$-Toda eigenfunctions. The proof is given by a contigulation relation of the $A_{N-1}$ Toda eigenfunctions and a recursion relation of the branching coefficients.
description: 7 pages
Introduction to Jung's method of resolution of singularities
Creators: name: Popescu-Pampu, Patrick
Publisher: name: arXiv
Year: 2007
Subjects: subject: Complex Variables (math.CV)
subject: FOS: Mathematics
subject: 32S45, 32C20

description: The present notes originated in the introductory course given at the Trieste Summer School on Resolution of Singularities, in June 2006. They focus on the resolution of complex analytic curves and surfaces by Jung's method. They do not contain detailed proofs, but mainly explanations of the main concepts and of their interrelations, as well as heuristics.
description: 35 pages, 7 figures. This is the published version. Compared to the first version on ArXiv, it contains a few corrections and a new final section of open problems
Terpenoid metabolites from three dorid nudibranchs and a new bromotryptamine derivative from the Northeast Pacific sponge Plocamissa igzo
Creators: name: Dumdei, Eric J.
Publisher: name: University of British Columbia
Year: 2008

description: Investigation of the terpenoid metabolites present in the extracts of three dorid nudibranchs has led to the isolation of sixteen known and ten new compounds. Structures were determined through extensive spectroscopic analysis. In addition, a new bromotryptamine derived compound was isolated from the Northeast Pacific sponge Plocamissa igzo. Specimens of Chromodoris geminus collected off the coast of Sri Lanka were found to contain the known spongian diterpenoid 34 aswell as the new metabolites 61 and 62. A study investigating the geographical variation in the metabolites present in Cadlina luteomarginata along the British Columbian coast revealed the drimane sesquiterpenoid albicanylacetate (72) to be the most widely distributed metabolite. Specimensof the nudibranch collected at Rennell Sound contained thesesquiterpenoid metabolites 68, 69 and 78-80 which could be traced to a locally abundant prey sponge in the genus Acanthella. Interestingly, the algal metabolite violacene (81) was also present in both the sponge and nudibranch extracts. A single specimen of C. luteomarginata collected in the process of actively laying eggs contained the sesquiterpenoids 68, 69 and 78 as well as the diterpenoidmetabolite 82. The egg mass of this individual contained the drimane derivatives 83 and 84, acetylated analogs of 72. Specimens collected off Anthony Island contained the previously described compoundsmicrocionin-2 (70), marginatafuran (74) and 9,1 1-dihydrogracillin A (87)as well as the new metabolites acanthene K (8 5 ), 20-acetoxymarginatone (86) and the labdane diterpenoid lutenenolide 68 X=NC 69 X = NCS 78 X = NHCHO 70 R1^p A c
Electronic structure of water from Koopmans-compliant functionals
Creators: name: de Almeida, James Moraes
name: Nguyen, Ngoc Linh
name: Colonna, Nicola
name: Chen, Wei
name: Miranda, Caetano Rodrigues
name: Pasquarello, Alfredo
name: Marzari, Nicola
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: Obtaining a precise theoretical description of the spectral properties of liquid water poses challenges for both molecular dynamics (MD) and electronic structure methods. The lower computational cost of the Koopmans-compliant functionals with respect to Green's function methods allows the simulations of many MD trajectories, with a description close to the state-of-art quasi-particle self-consistent GW plus vertex corrections method (QSGW+f$_{xc}$). Thus, we explore water spectral properties when different MD approaches are used, ranging from classical MD to first-principles MD, and including nuclear quantum effects. We have observed that the different MD approaches lead to up to 1 eV change in the average band gap, thus, we focused on the band gap dependence with the geometrical properties of the system to explain such spread. We have evaluated the changes in the band gap due to variations in the intramolecular O-H bond distance, and HOH angle, as well as the intermolecular hydrogen bond O$\cdot\cdot\cdot$O distance, and the OHO angles. We have observed that the dominant contribution comes from the O-H bond length; the O$\cdot\cdot\cdot$O distance plays a secondary role, and the other geometrical properties do not significantly influence the gap. Furthermore, we analyze the electronic density of states (DOS), where the KIPZ functional shows a good agreement with the DOS obtained with state-of-art approaches employing quasi-particle self-consistent GW plus vertex corrections. The O-H bond length also significantly influences the DOS. When nuclear quantum effects are considered, a broadening of the peaks driven by the broader distribution of the O-H bond lengths is observed, leading to a closer agreement with the experimental photoemission spectra.
Hadronic resonance production and interaction in p-Pb collisions at LHC energies in EPOS3
Creators: name: Knospe, A. G.
name: Markert, C.
name: Werner, K.
name: Steinheimer, J.
name: Bleicher, M.
Publisher: name: arXiv
Year: 2021
Subjects: subject: Nuclear Theory (nucl-th)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Using the EPOS3 model with UrQMD to describe the hadronic phase, we study the production of short-lived hadronic resonances and the modification of their yields and $p_{T}$ spectra in p-Pb collisions at $\sqrt{s_{NN}}$ = 5.02 TeV. High-multiplicity p-Pb collisions exhibit similar behavior to mid-peripheral Pb-Pb collisions at LHC energies, and we find indications of a short-lived hadronic phase in p-Pb collisions that can modify resonance yields and $p_{T}$ spectra through scattering processes. The evolution of resonance production is investigated as a function of the system size, which is related to the lifetime of the hadronic phase, in order to study the onset of collective effects in p-Pb collisions. We also study hadron production separately in the core and corona parts of these collisions, and explore how this division affects the total particle yields as the system size increases.
description: 12 pages, 10 figures, to be submitted to Physical Review C
Hotel Review Sentiment Analysis using Natural Language Processing
Creators: name: Λυκεσάς, Αλέξανδρος Γεωργίου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Επεξεργασία φυσικής γλώσσας
Τεχνητά νευρωνικά δίκτυα
Ανάλυση αισθήματος
Natural language processing
Artificial neural networks
Sentiment analysis

description: Written text in a natural language is a source of information with structure that is difficult for machines to comprehend. Natural Language Processing (NLP) is part of artificial intelligence that allows computers to understand natural language texts. This thesis presents different methods and techniques for classifying a text as having positive or negative meaning. The data used to train and evaluate these methods, is a bilingual (English and Greek) dataset extracted from Trip Advisor. The methods that were used are Term Frequency Inverse Document Frequency (TF-IDF), Recurrent Neural Networks using Bidirectional Long Short-Term Memory (LSTM) and Bidirectional Encoder Representations from Transformers (Bert). Multiple ex- periment variations were implemented to analyze the results and understand how every parameter that was used impacts the results. Bert outperformed the other methods when using only textual information in both languages. Methods using Bidirection LSTM models were found to perform better than methods using TF-IDF.
description: Το γραπτό κείμενο μίας φυσικής γλώσσας είναι μια πηγή πληροφοριών με δομή που είναι δύσκολο να κατανοήσουν οι υπολογιστές. Η επεξεργασία φυσικής γλώσσας (ΕΦΓ) αποτελεί μέρος της τεχνητής νοημοσύνης που επιτρέπει στους υπολογιστές να εξάγουν νοήματα από ανθρώπινα κείμενα. Αυτή η εργασία παρουσιάζει διάφορες μεθόδους και τεχνικές για την αναγνώριση θετικών ή αρνητικών νοημάτων ενός κειμένου. Η πηγή των δεδομένων που χρησιμοποι- θηκαν για την εκπαίδευση και αξιολόγηση των μεθόδων, επιλέχθηκε να είναι το δίγλωσσο σετ δεδομένων που εξήχθη από το Trip Advisor. Οι μέθοδοι που χρησιμοποιήθηκαν είναι TF-IDF, RNN χρησιμοποιώντας Bidirectional LSTM, και Bert. Διεξήχθησαν διάφορες παραλλαγές των πειραμάτων για να αναλυθούν τα αποτελέσματα και να βρεθεί πως κάθε παράμετρος επηρεάζει τα αποτελέσματα. Με χρήση μόνο πληροφοριών τύπου κειμένου το Bert είχε της καλύτερες επιδόσεις και στις δύο γλώσσες. Το BiLSTM βρέθηκε να είναι καλύτερο από το TF-IDF.
Phase diagram for Hole-Doped Kitaev System on the Honeycomb Lattice
Creators: name: Zhang, Su-Ming
name: Liu, Zheng-Xin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: FOS: Physical sciences

description: In extended Kitaev models on the honeycomb lattice, off-diagonal interactions (e.g. the $Γ, Γ^{'}$ terms) give rise to non-Kitaev quantum spin liquid (QSL) and several magnetically ordered phases. In the present work, we dope holes to the system and study the resultant $t$-$K$-$Γ$-$Γ^{'}$ model by mean field theory. The interplay between the charge and spin degrees of freedom results in a rich phase diagram. Similar to doped cuprates, superconductors, pseudogap phases, fermi liquid, strange metal and paramagnetic phase are generated. What is different is that, more than one superconducting phases (including a topological one) and more than one pseudogap phases are obtained no matter what the original spin state is. The Chern number of the topological superconductor is either $ν=\pm2$ or $ν=\pm1$, depending on the ratio $Γ/ |K|$ in the spin channel. We further find that an intermediate in-plane magnetic field can slightly enlarge the size of the topological superconducting phase.
Mesonic correlation functions at finite temperature and density in the Nambu-Jona-Lasinio model with a Polyakov loop
Creators: name: Hansen, H.
name: Alberico, W. M.
name: Beraudo, A.
name: Molinari, A.
name: Nardi, M.
name: Ratti, C.
Publisher: name: arXiv
Year: 2006
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We investigate the properties of scalar and pseudo-scalar mesons at finite temperature and quark chemical potential in the framework of the Nambu-Jona-Lasinio (NJL) model coupled to the Polyakov loop (PNJL model) with the aim of taking into account features of both chiral symmetry breaking and deconfinement. The mesonic correlators are obtained by solving the Schwinger-Dyson equation in the RPA approximation with the Hartree (mean field) quark propagator at finite temperature and density. In the phase of broken chiral symmetry a narrower width for the sigma meson is obtained with respect to the NJL case; on the other hand, the pion still behaves as a Goldstone boson. When chiral symmetry is restored, the pion and sigma spectral functions tend to merge. The Mott temperature for the pion is also computed.
description: 24 pages, 9 figures, version to appear in Phys. Rev. D
Supplementary File 1_GRIPP Short Form.docx
Creators: name: Farrin, Amanda J
name: Wright-Hughes, Alexandra
name: Moreau, Lauren
name: Schofield, Holly
name: Day, Florence
name: Murden, Geraldine
name: Green, John
name: Bowen, Audrey
name: Kidd, Lisa
name: Bojke, Chris
name: Forster, Anne
Publisher: name: figshare
Year: 2024
Subjects: classificationCode: 429999
subject: Other health sciences not elsewhere classified

description: GRIPP checklist reporting PPI in the LEAP Acceleration Award.
Scene Reconstruction And Understanding By RGB-D Sensors
Creators: name: Fioraio, Nicola <1987>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2015
Subjects: ING-INF/05 Sistemi di elaborazione delle informazioni

description: This thesis investigates interactive scene reconstruction and understanding using RGB-D data only. Indeed, we believe that depth cameras will still be in the near future a cheap and low-power 3D sensing alternative suitable for mobile devices too. Therefore, our contributions build on top of state-of-the-art approaches to achieve advances in three main challenging scenarios, namely mobile mapping, large scale surface reconstruction and semantic modeling. First, we will describe an effective approach dealing with Simultaneous Localization And Mapping (SLAM) on platforms with limited resources, such as a tablet device. Unlike previous methods, dense reconstruction is achieved by reprojection of RGB-D frames, while local consistency is maintained by deploying relative bundle adjustment principles. We will show quantitative results comparing our technique to the state-of-the-art as well as detailed reconstruction of various environments ranging from rooms to small apartments. Then, we will address large scale surface modeling from depth maps exploiting parallel GPU computing. We will develop a real-time camera tracking method based on the popular KinectFusion system and an online surface alignment technique capable of counteracting drift errors and closing small loops. We will show very high quality meshes outperforming existing methods on publicly available datasets as well as on data recorded with our RGB-D camera even in complete darkness. Finally, we will move to our Semantic Bundle Adjustment framework to effectively combine object detection and SLAM in a uniﬁed system. Though the mathematical framework we will describe does not restrict to a particular sensing technology, in the experimental section we will refer, again, only to RGB-D sensing. We will discuss successful implementations of our algorithm showing the beneﬁt of a joint object detection, camera tracking and environment mapping.
Methodologies for Synthesizable Programmable Devices based on Multi-Stage Switching Networks
Creators: name: Cuppini, Matteo <1984>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2015
Subjects: ING-INF/01 Elettronica

description: Nowadays the rise of non-recurring engineering (NRE) costs associated with complexity is becoming a major factor in SoC design, limiting both scaling opportunities and the flexibility advantages offered by the integration of complex computational units. The introduction of embedded programmable elements can represent an appealing solution, able both to guarantee the desired flexibility and upgradabilty and to widen the SoC market. In particular embedded FPGA (eFPGA) cores can provide bit-level optimization for those applications which benefits from synthesis, paying on the other side in terms of performance penalties and area overhead with respect to standard cell ASIC implementations. 
In this scenario this thesis proposes a design methodology for a synthesizable programmable device designed to be embedded in a SoC. A soft-core embedded FPGA (eFPGA) is hence presented and analyzed in terms of the opportunities given by a fully synthesizable approach, following an implementation flow based on Standard-Cell methodology. A key point of the proposed eFPGA template is that it adopts a Multi-Stage Switching Network (MSSN) as the foundation of the programmable interconnects, since it can be efficiently synthesized and optimized through a standard cell based implementation flow, ensuring at the same time an intrinsic congestion-free network topology. The evaluation of the flexibility potentialities of the eFPGA has been performed using different technology libraries (STMicroelectronics CMOS 65nm and BCD9s 0.11μm) through a design space exploration in terms of area-speed-leakage tradeoffs, enabled by the full synthesizability of the template. Since the most relevant disadvantage of the adopted soft approach, compared to a hardcore, is represented by a performance overhead increase, the eFPGA analysis has been made targeting small area budgets. The generation of the configuration bitstream has been obtained thanks to the implementation of a custom CAD flow environment, and has allowed functional verification and performance evaluation through an application-aware analysis.
Dressed Tunneling in Soft Hair
Creators: name: Wen, Wen-Yu
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We revisit the Parikh-Wilczek's tunneling model of Hawking radiation in the Schwarzschild black hole with soft hair. Unlike the no-hair black hole, tunneling through the degenerate event horizon generated by supertranslation hair picks up an angular dependence, which suggests a hairy modification to the Bekenstein-Hawking entropy. At last, we discuss several implications and possible observable of soft hair.
description: submitted version, 6 pages, 2 figure
On the properties of the exchange graph of a cluster algebra
Creators: name: Gekhtman, Michael
name: Shapiro, Michael
name: Vainshtein, Alek
Publisher: name: arXiv
Year: 2007
Subjects: subject: Combinatorics (math.CO)
subject: Symplectic Geometry (math.SG)
subject: FOS: Mathematics
subject: 22E46

description: We prove a conjecture about the vertices and edges of the exchange graph of a cluster algebra $\A$ in two cases: when $\A$ is of geometric type and when $\A$ is arbitrary and its exchange matrix is nondegenerate. In the second case we also prove that the exchange graph does not depend on the coefficients of $\A$. Both conjectures were formulated recently by Fomin and Zelevinsky.
description: Former Conjecture 2 split into Conjectures 2 and 3. Former Theorem 3 split into Theorems 4 and 5 accordingly. Former Section 2 split into Sections 2 and 3 accordingly. An error in the proof of case (i) of the former Theorem 3 (now Theorem 4) corrected, see 10 lines after equation (12)
Introducing endogenous transport provision in a LUTI model to explore polycentric governance systems
Creators: name: Raimbault, Juste
name: Néchet, Florent Le
Publisher: name: arXiv
Year: 2021
Subjects: subject: Physics and Society (physics.soc-ph)
subject: Multiagent Systems (cs.MA)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Models focusing on interactions between land-use and transportation mostly assume an exogenous provision of transportation infrastructures. We investigate here co-evolutionary processes between land-use and transportation, at the scale of Mega-City Regions, by introducing a toy model of corresponding processes. In particular, our model is specifically tailored to include governance processes ruling the growth of transportation infrastructure. We show through stylised numerical simulations the potentialities of our model to reproduce a variety of dynamics when co-evolution is taken into account. We then apply the model to a case study, by calibrating it for the Pearl River Delta Mega-city Region (China, 1990-2010). To go beyond this first modelling step, we elaborate on the challenges to overcome to go further towards more complex models integrating co-evolution between transportation networks and territories in urban systems.
description: 27 pages with supplementary material, 8 figures, 3 tables
Comparative study of classical and quantum engineering learning algorithms
Creators: name: Μπαλάς, Γεώργιος Κωνσταντίνου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Κβαντική μηχανική μάθηση
Μηχανική μάθηση
Κβαντικό νευρωνικό δίκτυο
Quantum machine learning
Machine learning
Quantum neural network

description: Machine learning is considered as the top trend in 21st century. Everyone interacts with it, everyone talks about it. In the end of the day, nobody knows exactly what it is and what exactly does. And above that, the last few years a new meaning introduced to us, quantum computing. Alongside machine learning, quantum computing brought quantum machine learning that will breakthrough at science and eventually our lives. This thesis will present some basic principles of the two types of machine learning, will analyze some basic algorithms of both of them, reproduce them in Python and compare them. The whole thesis alongside the code and the results are uploaded public on GitHub at https://github.com/gkbalas/machine_learning_thesis. Ελληνική Περίληψη
description: Η μηχανική μάθηση θεωρείται ως η κορυφαία τάση στον 21ο αιώνα. Όλοι αλληλεπιδρούν με αυτήν, όλοι μιλούν γι’ αυτήν. Στο τέλος της ημέρας, κανείς δεν γνωρίζει τι ακριβώς είναι και τι ακριβώς κάνει. Και πάνω από όλα αυτά, τα τελευταία χρόνια μια νέα έννοια μας παρουσιάζεται, η κβαντική υπολογιστική. Παράλληλα με την μηχανική μάθηση, ο κβαντικός υπολογισμός έφερε την κβαντική μηχανική μάθηση που επιφέρει σημαντική ανακάλυψη στην επιστήμη και τελικά στη ζωή μας. Αυτή η εργασία θα παρουσιάσει μερικές βασικές αρχές των δυο τύπωςν μηχανικής μάθησης, θα αναλύση κάποιους βασικούς αλγορίθμους και των δυο, θα τις αναπαράγει στην Python και θα τις συγκρίνει. Η εργασία μαζί με τον κώδικα και τα αποτελέσματα δημοσιεύονται στο GitHub στη σελίδα https://github.com/gkbalas/machine_learning_thesis.
Reinforcement Learning For Data Poisoning on Graph Neural Networks
Creators: name: Dineen, Jacob
name: Haque, A S M Ahsan-Ul
name: Bielskas, Matthew
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Artificial Intelligence (cs.AI)
subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: Adversarial Machine Learning has emerged as a substantial subfield of Computer Science due to a lack of robustness in the models we train along with crowdsourcing practices that enable attackers to tamper with data. In the last two years, interest has surged in adversarial attacks on graphs yet the Graph Classification setting remains nearly untouched. Since a Graph Classification dataset consists of discrete graphs with class labels, related work has forgone direct gradient optimization in favor of an indirect Reinforcement Learning approach. We will study the novel problem of Data Poisoning (training time) attack on Neural Networks for Graph Classification using Reinforcement Learning Agents.
Outcomes feto-neonatali dell'infezione non primaria da Cytomegalovirus
Fetal and neonatal outcomes of non primary cytomegalovirus maternal infection
Creators: name: Puccetti, Chiara <1980>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2015
Subjects: MED/40 Ginecologia e ostetricia

description: OBIETTIVI: Valutazione del rischio di trasmissione verticale e delle conseguenze dell’infezione congenita da cytomegalovirus (CMV) in caso di infezione non primaria versus l’outcome delle gravidanze complicate da infezione primaria.
MATERIALI E METODI: Studio retrospettivo di coorte di gravide con infezione recente da CMV diagnosticata c/o il nostro centro negli anni 2000-2013. Le pazienti sono state suddivise in 2 gruppi in base al risultato delle indagini sierologiche (avidità IgG e immunoblot): il primo con profilo sierologico compatibile con infezione non primaria e l'altro compatibile con infezione primaria da CMV. Sono stati confrontati il rischio di trasmissione e di infezione congenita sintomatica nei due gruppi.
RISULTATI: Il follow-up è risultato disponibile in 1122 casi di cui 182 con infezione materna non-primaria e 940 con infezione primaria materna. L’infezione congenita è stata diagnosticata in 7 (3.86%) feti/neonati nei casi di infezione non primaria e in 217 (23%) feti/neonati nei casi di infezione primaria (p<0.001). Tra gli infetti, erano sintomatici 43 (19,8%) e 3 (42,8%) rispettivamente nell’infezione primaria e non primaria. 
COMMENTO: La preesistente immunità materna offre una protezione contro la trasmissione intrauterina nell’infezione da CMV ma non protegge dalla malattia congenita sintomatica.
description: OBJECTIVE: To evaluate fetal and neonatal outcomes in case of non-primary cytomegalovirus (CMV) infection.
STUDY DESIGN: Retrospective cohort study, including pregnant women with active CMV infection, referred to our units in a 13-year period (2000-2013). Patients were divided into two groups according to the results of confirmatory serologic testing (avidity test, immunoblotting): serologic profile consistent with non-primary infection and serologic profile suggestive of primary infection. The vertical transmission rate and the percentage of symptomatic congenital infection were compared into the two groups.
RESULTS:  Follow-up was available in 1122 cases, including 182 non-primary infections and 940 primary maternal infections. Congenital infection was diagnosed in 7 (3.86%) fetuses/neonates of non-primary infection group and in 217 (23%) fetuses/neonates of primary infection group (p<0.001). Symptomatic infected fetuses/neonates rate was similar into the two groups:  3 (42,8%) in non-primary infections versus 43 (19,8%) in primary infections (p = 0,13).
CONCLUSION: Previous maternal immunity offers substantial protection against intrauterine transmission of CMV infection, but not against disease once the fetus is infected.
Improved Analysis of the Tsallis-INF Algorithm in Stochastically Constrained Adversarial Bandits and Stochastic Bandits with Adversarial Corruptions
Creators: name: Masoudian, Saeed
name: Seldin, Yevgeny
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: We derive improved regret bounds for the Tsallis-INF algorithm of Zimmert and Seldin (2021). We show that in adversarial regimes with a $(Δ,C,T)$ self-bounding constraint the algorithm achieves $\mathcal{O}\left(\left(\sum_{i\neq i^*} \frac{1}{Δ_i}\right)\log_+\left(\frac{(K-1)T}{\left(\sum_{i\neq i^*} \frac{1}{Δ_i}\right)^2}\right)+\sqrt{C\left(\sum_{i\neq i^*}\frac{1}{Δ_i}\right)\log_+\left(\frac{(K-1)T}{C\sum_{i\neq i^*}\frac{1}{Δ_i}}\right)}\right)$ regret bound, where $T$ is the time horizon, $K$ is the number of arms, $Δ_i$ are the suboptimality gaps, $i^*$ is the best arm, $C$ is the corruption magnitude, and $\log_+(x) = \max\left(1,\log x\right)$. The regime includes stochastic bandits, stochastically constrained adversarial bandits, and stochastic bandits with adversarial corruptions as special cases. Additionally, we provide a general analysis, which allows to achieve the same kind of improvement for generalizations of Tsallis-INF to other settings beyond multiarmed bandits.
description: Published Version in COLT 2021
Learning Methods and Algorithms for Semantic Text Classification across Multiple Domains
Creators: name: Pasolini, Roberto <1986>
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2015
Subjects: ING-INF/05 Sistemi di elaborazione delle informazioni

description: Information is nowadays a key resource: machine learning and data mining techniques have been developed to extract high-level information from great amounts of data. As most data comes in form of unstructured text in natural languages, research on text mining is currently very active and dealing with practical problems.
Among these, text categorization deals with the automatic organization of large quantities of documents in priorly defined taxonomies of topic categories, possibly arranged in large hierarchies. In commonly proposed machine learning approaches, classifiers are automatically trained from pre-labeled documents: they can perform very accurate classification, but often require a consistent training set and notable computational effort.
Methods for cross-domain text categorization have been proposed, allowing to leverage a set of labeled documents of one domain to classify those of another one. Most methods use advanced statistical techniques, usually involving tuning of parameters. A first contribution presented here is a method based on nearest centroid classification, where profiles of categories are generated from the known domain and then iteratively adapted to the unknown one. Despite being conceptually simple and having easily tuned parameters, this method achieves state-of-the-art accuracy in most benchmark datasets with fast running times.
A second, deeper contribution involves the design of a domain-independent model to distinguish the degree and type of relatedness between arbitrary documents and topics, inferred from the different types of semantic relationships between respective representative words, identified by specific search algorithms. The application of this model is tested on both flat and hierarchical text categorization, where it potentially allows the efficient addition of new categories during classification. Results show that classification accuracy still requires improvements, but models generated from one domain are shown to be effectively able to be reused in a different one.
Continous Measurement of the Energy Eigenstates of a Nanomechanical Resonator without a Non-Demolition Probe
Creators: name: Jacobs, Kurt
name: Lougovski, Pavel
name: Blencowe, Miles
Publisher: name: arXiv
Year: 2006
Subjects: subject: Quantum Physics (quant-ph)
subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: We show that it is possible to perform a continuous measurement that continually projects a nano-resonator into its energy eigenstates by employing a linear coupling with a two-state system. This technique makes it possible to perform a measurement that exposes the quantum nature of the resonator by coupling it to a Cooper-pair Box and a superconducting transmission-line resonator.
description: 4 pages, revtex4, two eps figures. v2: new results, much improved implementation; v4: published version, some terminology changed
Complementarity and the nature of uncertainty relations in Einstein-Bohr recoiling slit experiment
Creators: name: Tanimura, Shogo
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: A model of the Einstein-Bohr double-slit experiment is formulated in a fully quantum theoretical setting. In this model, the state and dynamics of a movable wall that has the double slits in it, as well as the state of a particle incoming to the double slits, are described by quantum mechanics. Using this model, we analyzed complementarity between exhibiting the interference pattern and distinguishing the particle path. Comparing the Kennard-Robertson type and the Ozawa-type uncertainty relations, we conclude that the uncertainty relation involved in the double-slit experiment is not the Ozawa-type uncertainty relation but the Kennard-type uncertainty relation of the position and the momentum of the double-slit wall. A possible experiment to test the complementarity relation is suggested. It is also argued that various phenomena which occur at the interface of a quantum system and a classical system, including distinguishability, interference, decoherence, quantum eraser, and weak value, can be understood as aspects of entanglement.
description: 13 pages, 2 figures. The title is changed. Some references are added
Modelling lipid-coated microbubbles in focused ultrasound applications at subresonance frequencies
Creators: name: Gümmer, Jonas
name: Schenke, Sören
name: Denner, Fabian
Publisher: name: arXiv
Year: 2021
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: Medical Physics (physics.med-ph)
subject: FOS: Physical sciences

description: We present a computational study of the behaviour of a lipid-coated SonoVue microbubble with initial radius $1 \, μ\text{m} \leq R_0 \leq 2 \, μ\text{m}$, excited at frequencies (200-1500 kHz) significantly below the linear resonance frequency and pressure amplitudes of up to 1500 kPa, an excitation regime used in many focused ultrasound applications. The bubble dynamics are simulated using the Rayleigh-Plesset equation and the Gilmore equation, in conjunction with the Marmottant model for the lipid monolayer coating. Also, a new continuously differentiable variant of the Marmottant model is introduced. Below the onset of inertial cavitation, a linear regime is identified in which the maximum pressure at the bubble wall is linearly proportional to the excitation pressure amplitude and, likewise, the mechanical index. This linear regime is bounded by the Blake pressure and, in line with recent in vitro experiments, the onset of inertial cavitation is found to occur approximately at an excitation pressure amplitude of 130-190 kPa, dependent on the initial bubble size. In the nonlinear regime the maximum pressure at the bubble wall is found to be readily predicted by the maximum bubble radius and both the Rayleigh-Plesset and Gilmore equations are shown to predict the onset of sub- and ultraharmonic frequencies of the acoustic emissions compared to in vitro experiments. Neither the surface dilatational viscosity of the lipid monolayer nor the compressibility of the liquid have a discernible influence on the studied quantities, yet accounting for the lipid coating is critical for the accurate prediction of the bubble behaviour. The Gilmore equation is shown to be valid for the considered bubbles and excitation regime, and the Rayleigh-Plesset equation also provides accurate qualitative predictions, even though it is outside its range of validity for many of the considered cases.
Empirical distribution of k-word matches in biological sequences
Creators: name: Foret, Sylvain
name: Wilson, Susan R.
name: Burden, Conrad J.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Quantitative Methods (q-bio.QM)
subject: Genomics (q-bio.GN)
subject: FOS: Biological sciences

description: This study focuses on an alignment-free sequence comparison method: the number of words of length k shared between two sequences, also known as the D_2 statistic. The advantages of the use of this statistic over alignment-based methods are firstly that it does not assume that homologous segments are contiguous, and secondly that the algorithm is computationally extremely fast, the runtime being proportional to the size of the sequence under scrutiny. Existing applications of the D_2 statistic include the clustering of related sequences in large EST databases such as the STACK database. Such applications have typically relied on heuristics without any statistical basis. Rigorous statistical characterisations of the distribution of D_2 have subsequently been undertaken, but have focussed on the distribution's asymptotic behaviour, leaving the distribution of D_2 uncharacterised for most practical cases. The work presented here bridges these two worlds to give usable approximations of the distribution of D_2 for ranges of parameters most frequently encountered in the study of biological sequences.
description: 23 pages, 10 figures
Dark Matter Daily Modulation With Anisotropic Organic Crystals
Creators: name: Blanco, Carlos
name: Kahn, Yonatan
name: Lillard, Benjamin
name: McDermott, Samuel D.
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Physics - Experiment (hep-ex)
subject: Chemical Physics (physics.chem-ph)
subject: FOS: Physical sciences

description: Aromatic organic compounds, because of their small excitation energies ~ O(few eV) and scintillating properties, are promising targets for detecting dark matter of mass ~ O(few MeV). Additionally, their planar molecular structures lead to large anisotropies in the electronic wavefunctions, yielding a significant daily modulation in the event rate expected to be observed in crystals of these molecules. We characterize the daily modulation rate of dark matter interacting with an anisotropic scintillating organic crystal such as trans-stilbene, and show that daily modulation is an ~ O(1) fraction of the total rate for small DM masses and comparable to, or larger than, the ~ 10% annual modulation fraction at large DM masses. As we discuss in detail, this modulation provides significant leverage for detecting or excluding dark matter scattering, even in the presence of a non-negligible background rate. Assuming a non-modulating background rate of 1/min/kg that scales with total exposure, we find that a 100 kg yr experiment is sensitive to the cross section corresponding to the correct relic density for dark matter masses between 1.3-14 MeV (1.5-1000 MeV) if dark matter interacts via a heavy (light) mediator. This modulation can be understood using an effective velocity scale v* = Delta E/q*, where Delta E is the electronic transition energy and q* is a characteristic momentum scale of the electronic orbitals. We also characterize promising future directions for development of scintillating organic crystals as dark matter detectors.
description: 22 pages, 11 figures; v2: matches journal version up to typo fixed in eq. (12)
Δομή των κοινοτήτων του φυτοπλαγκτού σε εύτροφες ελληνικές λίμνες
Creators: name: Γεωργούλης, Φίλιππος Ιωάννη
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Φυτοπλαγκτό
Δίκτυα
Συσχετίσεις
Phytoplankton
Networks
Correlations

description: Στην παρούσα εργασία διερευνήθηκαν οι σχέσεις και αλληλεπιδράσεις ανάμεσα στα είδη φυτοπλαγκτού σε 7 εύτροφες ρηχές ελληνικές λίμνες με τη χρήση δεικτών συσχέτισης και δικτύων απεικόνισης συνδέσεων-αλληλεπιδράσεων των οργανισμών. Στις λίμνες που εξετάστηκαν η χρήση δικτύων έδειξε ποια είδη συνυπάρχουν και πως επηρεάζονται μεταξύ τους αρνητικά ή θετικά. Χρησιμοποιήθηκαν πρωτογενή δεδομένα σύνθεσης-παρουσίας ειδών και ταξινομικών/ λειτουργικών ομάδων φυτοπλαγκτού καθώς και βιομάζας από κάθε λίμνη. Παρατηρήθηκαν διαφορές στη δομή των δικτύων συσχέτισης τόσο ανάμεσα στις λίμνες όσο και στην ίδια λίμνη με τη χρήση διαφορετικών δεικτών και κριτηρίων συσχέτισης.
description: In the present study we investigated the relationships and interactions between phytoplankton species in 7 shallow eutrophic Greek lakes using correlation indices and linkage-interaction imaging networks of organisms. In the studied lakes the use of networks showed which species co-exist and how they are negatively or positively influenced by each other. Original composition data on species level and on taxonomic / functional level as well as biomass data from each lake were used. Differences in the structure of the networks between the lakes and within the same lake were observed using different correlation indices and criteria.
title: Μελέτη του χημισμού γύψων του Νεογενούς σε αντιπροσωπευτικές θέσεις στην Κρήτη
Creators: name: Ζαμπετακη Σταματια-Νικολινα
Publisher: name: Technical University of Crete
Year: 2024

description: Η παρούσα διπλωματική εργασία εστιάζει στην ανάλυση του χημισμού θειικών αλάτων/ορυκτών (γύψων-ανυδριτών) σε επιλεγμένες θέσεις της Κρήτης, με απώτερο στόχο τη μελέτη κατανομής των ιχνοστοιχείων και ιδιαίτερα του στροντίου. Μελετήθηκαν συνολικά εικοσιένα (21) αντιπροσωπευτικά δείγματα από σχηματισμούς του Νεογενούς. Συγκεκριμένα, συλλέχθηκαν και αναλύθηκαν 3 δείγματα από ιστορικό γυψωρυχείο στην Κνωσό, 6 δείγματα από την περιοχή της Πλουτής στην κεντρική Κρήτη, 6 δείγματα από την περιοχή του Μύρτου νοτιοδυτικά του νομού Λασιθίου και 6 δείγματα από την περιοχή των Καλλεργιανών στη δυτική Κρήτη. Αναλύθηκαν και 6 επιπλέον δείγματα του Περμο/Τριαδικού από το γυψωρυχείο Αλτσί στην ανατολική Κρήτη ώστε να γίνουν συγκρίσεις με τα δείγματα του Νεογενούς. Η χημική ανάλυση των δειγμάτων πραγματοποιήθηκε με τις μεθόδους φασματομετρίας φθορισμού ακτινών Χ (XRF) και περίθλασης ακτινών Χ (XRD), παρέχοντας επαρκή δεδομένα για την ποσοτική κατανομή των στοιχείων. Η μελέτη περιλαμβάνει παράθεση των διαδικασιών σχηματισμού και μετατροπής του γύψου και του ανυδρίτη υπό διαφορετικές συνθήκες θερμοκρασίας και πίεσης και τη διαφοροποίηση στις συγκεντρώσεις του στροντίου σε κάθε δείγμα. Τα αποτελέσματα της έρευνας αποκάλυψαν πέρα από τις τιμές των συγκεντρώσεων στροντίου και των άλλων στοιχείων και ιχνοστοιχείων σε κάθε αντιπροσωπευτικό δείγμα, τη γεωλογική ποικιλότητα και την πολυπλοκότητα των διεργασιών που επηρέασαν τη δημιουργία των συγκεκριμένων σχηματισμών γύψου στην Κρήτη κατά τη περίοδο του Νεογενούς καθώς οι συγκεντρώσεις του στροντίου σχετίζονται όχι μόνο με τις αποθετικές αλλά και με τις ιδιαίτερα ξηρές κλιματικές συνθήκες που επικρατούσαν κατά τη διάρκεια εναπόθεσης των εβαποριτών.
Ανάπτυξη και επικύρωση μεθόδου ανίχνευσης λακοσαμίδης με αέρια χρωματογραφία συζευγμένη με φασματογράφο μάζας
Creators: name: Φλώρου, Μαρία Χρήστου
Publisher: name: Aristotle University of Thessaloniki
Year: 2020
Subjects: Κλινική Τοξικολογία
Λακοσαμίδη
Αέρια χρωματογραφία-φασματογραφία μάζας
Επιληψία
Θανατηφόρος δόση
Clinical Toxicology
Lacosamide
Gas chromatography- mass spectrometry
Epilepsy
Fatal overdose concentration

description: Το θέμα της παρούσας διπλωματικής είναι η ανάπτυξη μίας μεθόδου προσδιορισμού της λακοσαμίδης σε δείγματα αίματος με τη μέθοδο της αέριας χρωματογραφίας συζευγμένη με φασματομετρία μάζας. Η λακοσαμίδη είναι αντιεπιληπτικό φάρμακο για τον έλεγχο των κρίσεων της εστιακής επιληψίας σε ενήλικες και παιδιά άνω των 4 ετών (>50 Kg) και χρησιμοποιείται ως μονοθεραπεία αλλά και σε συνδυασμό με άλλα φάρμακα. Στο στάδιο της ανάπτυξης της μεθόδου, επιλέχθηκε ως μέθοδος προκατεργασίας η εκχύλιση υγρού- υγρού, ενώ έπειτα έγιναν και δοκιμές βελτίωσης του σταδίου της προκατεργασίας. Μετά την ολοκλήρωση της διαδικασίας ανάπτυξης της μεθόδου ακολουθήθηκε η επικύρωση αυτής. Τέλος , εφαρμόστηκε η νέα αυτή μέθοδος σε τρία κλινικά δείγματα και σε ένα μεταθανάτιο
description: The subject of the dissertation is the development of a method for the determination of lacosamide in blood samples using Gas Chromatography /Μass Spectrometry. Lacosamide is an antiepileptic drug used for the control of epileptic seizures in adults and children over 4 years old (>50 kg) with focal epilepsy. It can be used as a monotherapy or in combination with other antiepileptic drugs. Liquid-liquid extraction (LLE) applied as a sample preparation method to extract lacosamide from whole blood samples. Afterward, different preparation conditions were selected to optimize the preparation procedure. The method was validated and applied to three clinical and one postmortem blood samples
Diazine-bridged coordination polymers of copper and nickel : synthesis and thermal, spectral, structural, and magnetic properties
Creators: name: Otieno, Tom
Publisher: name: University of British Columbia
Year: 2008

description: A large number of coordination compounds of copper(I), copper (II) and nickel (II) have been prepared and characterized by thermal, spectroscopic and X-ray diffraction methods as well as by elemental analysis and magnetic susceptibility measurements. The neutral ligands used in the study were pyrazine (1,4-diazine), pyridazine (1,2-diazine), methylpyrazine, 2,5-dimethylpyrazine, pyridine and 4,4'-bipyridine. Anionic ligands of a range of coordinating abilities were employed. These include cyanate, nitrate, methanesulfonate, hexafluoroarsenate, hexafluorophosphate, chloride and thiocyanate anions. Polymeric and mononuclear compounds were isolated. The polymeric materials were found to be of three basic structural types: one-dimensional extended chains, two-dimensional square lattices or infinite three-dimensional lattices. These include the novel copper(I) complexes,[Cu₂(2,5-me₂pyz)₃][PF₆]₂ and [Cu(2,5-me₂pyz)₂][PF₆], which have graphite-related and diamond-related cationic lattices, respectively. Cu(mepyz)₂(NCO)₂, a two-dimensional polymer, represents the first compound containing methylpyrazine to be structurally characterized by single crystal X-ray diffraction. Magneto-structural correlations were made for all the compounds. Whenever possible the magnetic susceptibility data of the complexes were analyzed by theoretical models. The trimeric compound, [Cu(pdz)₂(NO₃)₂]₃, was found to exhibit the largest antiferromagnetic exchange coupling, with a J value of -139 cm⁻¹. The copper ions in another pyridazine complex, Cu(pdz)(NCO)₂, were also found to be strongly coupled antiferromagnetically, with a J value of -44 cm⁻¹. Five nickel compounds, Ni(py)₂(NCS)₂, Ni(py)Cl₂, Ni(pyz)Cl₂, Ni(pyz)(NCO)₂ and Ni(pyz)(NCS)₂, exhibited metamagnetic behaviour. All the other copper (II) and nickel (II) complexes studied were found to be magnetically dilute or to involve only weakly antiferromagnetically coupled metal centres.