cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Variance estimation for Brier Score decomposition
Creators: name: Siegert, Stefan
Publisher: name: arXiv
Year: 2013
Subjects: subject: Methodology (stat.ME)
subject: FOS: Computer and information sciences

description: The Brier Score is a widely-used criterion to assess the quality of probabilistic predictions of binary events. The expectation value of the Brier Score can be decomposed into the sum of three components called reliability, resolution, and uncertainty which characterize different forecast attributes. Given a dataset of forecast probabilities and corresponding binary verifications, these three components can be estimated empirically. Here, propagation of uncertainty is used to derive expressions that approximate the sampling variances of the estimated components. Variance estimates are provided for both the traditional estimators, as well as for refined estimators that include a bias correction. Applications of the derived variance estimates to artificial data illustrate their validity, and application to a meteorological prediction problem illustrates a possible use case. The observed increase of variance of the bias-corrected estimators is discussed.
description: 10 pages, 2 figures, 2 tables
Semi-empirical many-body formalism of optical absorption in nanosystems and molecules
Creators: name: Honet, Antoine
name: Henrard, Luc
name: Meunier, Vincent
Publisher: name: arXiv
Year: 2020
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: A computationally efficient Green's function approach is developed to evaluate the optical properties of nanostructures using a GW formalism applied on top of a tight-binding and mean-field Hubbard model. The use of the GW approximation includes key parts of the many-body physics that govern the optical response of nanostructures and molecules subjected to an external electromagnetic field. Such description of the electron-electron correlation yields data that are in significantly improved agreement with experiments performed on a subset of polycyclic aromatic hydrocarbons (PAHs) considered for illustrative purpose. More generally, the method is applicable to any structure whose electronic properties can be described in first approximation within a mean-field approach and is amenable for high-throughput studies aimed at screening materials with desired optical properties.
Unified formalism for higher-order variational problems and its applications in optimal control
Creators: name: Colombo, Leonardo
name: Prieto-Martínez, Pedro D.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences
subject: 70H50, 22E70, 49J15, 53C80

description: In this paper we consider an intrinsic point of view to describe the equations of motion for higher-order variational problems with constraints on higher-order trivial principal bundles. Our techniques are an adaptation of the classical Skinner-Rusk approach for the case of Lagrangian dynamics with higher-order constraints. We study a regular case where it is possible to establish a symplectic framework and, as a consequence, to obtain a unique vector field determining the dynamics. As an interesting application we deduce the equations of motion for optimal control of underactuated mechanical systems defined on principal bundles.
description: 28 pp. Revised version: Minor corrections done
Quantum Fully Homomorphic Encryption by Integrating Pauli One-time Pad with Quaternions
Creators: name: Ma, Guangsheng
name: Li, Hongbo
Publisher: name: arXiv
Year: 2020
Subjects: subject: Quantum Physics (quant-ph)
subject: Computational Complexity (cs.CC)
subject: Cryptography and Security (cs.CR)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Quantum fully homomorphic encryption (QFHE) allows to evaluate quantum circuits on encrypted data. We present a novel QFHE scheme, which extends Pauli one-time pad encryption by relying on the quaternion representation of SU(2). With the scheme, evaluating 1-qubit gates is more efficient, and evaluating general quantum circuits is polynomially improved in asymptotic complexity. Technically, a new encrypted multi-bit control technique is proposed, which allows to perform any 1-qubit gate whose parameters are given in the encrypted form. With this technique, we establish a conversion between the new encryption and previous Pauli one-time pad encryption, bridging our QFHE scheme with previous ones. Also, this technique is useful for private quantum circuit evaluation. The security of the scheme relies on the hardness of the underlying quantum capable FHE scheme, and the latter sets its security on the learning with errors problem and the circular security assumption.
Model independent determination of the dark matter mass from direct detection experiments
Creators: name: Kavanagh, Bradley J.
name: Green, Anne M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Determining the dark matter (DM) mass is of paramount importance for understanding dark matter. We present a novel parametrization of the DM speed distribution which will allow the DM mass to be accurately measured using data from Weakly Interacting Massive Particle (WIMP) direct detection experiments. Specifically, we parametrize the natural logarithm of the speed distribution as a polynomial in the speed v. We demonstrate, using mock data from upcoming experiments, that by fitting the WIMP mass and interaction cross-section, along with the polynomial coefficients, we can accurately reconstruct both the WIMP mass and speed distribution. This new method is the first demonstration that an accurate, unbiased reconstruction of the WIMP mass is possible without prior assumptions about the distribution function. We anticipate that this technique will be invaluable in the analysis of future experimental data.
description: 5 pages, 3 figures. Minor changes. Matches version published in PRL
Subducting carbon
Creators: name: Plank, Terry A.
name: Manning, Craig
Publisher: name: Columbia University
Year: 2019
Subjects: subject: Geochemistry
subject: FOS: Earth and related environmental sciences
subject: Carbon cycle (Biogeochemistry)
subject: Subduction zones

description: A hidden carbon cycle exists inside Earth. Every year, megatons of carbon disappear into subduction zones, affecting atmospheric carbon dioxide and oxygen over Earth’s history. Here we discuss the processes that move carbon towards subduction zones and transform it into fluids, magmas, volcanic gases and diamonds. The carbon dioxide emitted from arc volcanoes is largely recycled from subducted microfossils, organic remains and carbonate precipitates. The type of carbon input and the efficiency with which carbon is remobilized in the subduction zone vary greatly around the globe, with every convergent margin providing a natural laboratory for tracing subducting carbon.
title: Τεχνικές σχεδίασης σε επίπεδο συστήματος και κυκλωμάτων μετατροπέων Delta-Sigma AD
Creators: name: Βολάνης Γεώργιος
Publisher: name: Technical University of Crete
Year: 2010

description: Μη διαθέσιμο
Process Fermentation of Filtrate Bamboo with Saccharomyces Cerevisiae and Zymomonas Mobilis: An Advance Study
Creators: name: N. K. Sari
name: D. Ernawati
Publisher: name: Zenodo
Year: 2021
Subjects: Fermentation
filtrate bamboo
enzyme
saccharomyces cerevisiae
zymomonas mobilis

description: Fermentation is the process of the formation of ethanol from glucose by using enzymes. Bamboo is one of the materials containing glucose is high enough, that is previously done hydrolysis in advance. Bamboo used when the hydrolysis process of bamboo that does not include lignin and the pentose done process of pretreatment and not lignification. The purpose of this research is to produce ethanol as a raw material substitution of bioethanol, knowing pentose and dirt left in the bamboo. Therefore, need to be studied in the future, with the best process, that we used biological processes that can optimize the production of ethanol. The use of the enzyme (Saccharomyces Cerevisiae and Zymomonas Mobilis) is also significant because of the optimum enzyme conditions. Temperature, pH, and the yeast with optimal conditions when it can raise the level of his work. The fermentation process at temperature 25°C and 45°C, the filtrate is 500 ml solution of bamboo and the stirring speed of 200 rpm. The variable composed enzyme with a ratio (v/v) of 0.25 to 0.75. Resulting from the fermentation processed can produce ethanol with a yield 30.5% and 36% of the weight of the bamboo. The result of the process of fermentation obtained bioethanol with low ethanol yield of 10-15%, which requires the flash distillation process to obtain yield bioethanol technical 90-95%. The Saccharomyces C. had higher glucose and bioethanol levels results of Zymomonas M., but durability Zymomonas M. stronger in a fermentation process.
Petri Net Based Symbolic Model Checking for Computation Tree Logic of Knowledge
Creators: name: He, Leifeng
name: Liu, Guanjun
Publisher: name: arXiv
Year: 2020
Subjects: subject: Software Engineering (cs.SE)
subject: FOS: Computer and information sciences
subject: D.2.4
subject: 68Q60

description: Computation Tree Logic of Knowledge (CTLK) can specify many design requirements of privacy and security of multi-agent systems (MAS). In our conference paper, we defined Knowledge-oriented Petri Nets (KPN) to model MAS and proposed Reachability Graphs with Equivalence Relations (RGER) to verify CTLK. In this paper, we use the technique of Ordered Binary Decision Diagrams (OBDD) to encode RGER in order to alleviate the state explosion problem and enhance the verification efficiency. We propose a heuristic method to order those variables in OBDD, which can well improve the time and space performance of producing, encoding and exploring a huge state space. More importantly, our method does not produce and encode any transition or equivalence relation of states when producing and encoding an RGER, and in fact it dynamically produces those transition or equivalence relations that are required in the verification process of CTLK formulas. This policy can save a lot of time and space since the number of transition or equivalence relations of states is much greater than the number of states themselves. We design symbolic model checking algorithms, develop a tool and apply them to two famous examples: Alice-Bob Protocol and Dining Cryptographers Protocol. We compare our tool with MCMAS which is the state-of-the-art model checker of verifying CTLK. The experimental results illustrate the advantages of our model and method. Our tool running in a general PC can totally spend less than 14 hours to verify Dining Cryptographers Protocol with 1200 concurrent cryptographers where there are about $10^{1080}$ states and the two verified CTLK formulas have more than 6000 atomic propositions and more than 3600 operators. These good performances are owed to a combination of the OBDD technique and the structure characteristics of KPN.
description: 23 pages, 17 figures, 4 tables, 56 references
Subgraph complementation and minimum rank
Creators: name: Buchanan, Calum
name: Purcell, Christopher
name: Rombach, Puck
Publisher: name: arXiv
Year: 2021
Subjects: subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 05C62 (primary) 05C75, 05C50 (secondary)

description: Any finite simple graph $G = (V,E)$ can be represented by a collection $\mathscr{C}$ of subsets of $V$ such that $uv\in E$ if and only if $u$ and $v$ appear together in an odd number of sets in $\mathscr{C}$. Let $c_2(G)$ denote the minimum cardinality of such a collection. This invariant is equivalent to the minimum dimension of a faithful orthogonal representation of $G$ over $\mathbb{F}_2$ and is closely connected to the minimum rank of $G$. We show that $c_2(G) = \operatorname{mr}(G,\mathbb{F}_2)$ when $\operatorname{mr}(G,\mathbb{F}_2)$ is odd, or when $G$ is a forest. Otherwise, $\operatorname{mr}(G,\mathbb{F}_2)\leq c_2(G)\leq \operatorname{mr}(G,\mathbb{F}_2)+1$. Furthermore, we show that the following are equivalent for any graph $G$ with at least one edge: i. $c_2(G)=\operatorname{mr}(G,\mathbb{F}_2)+1$; ii. the adjacency matrix of $G$ is the unique matrix of rank $\operatorname{mr}(G,\mathbb{F}_2)$ which fits $G$ over $\mathbb{F}_2$; iii. there is a minimum collection $\mathscr{C}$ as described in which every vertex appears an even number of times; and iv. for every component $G'$ of $G$, $c_2(G') = \operatorname{mr}(G',\mathbb{F}_2) + 1$. We also show that, for these graphs, $\operatorname{mr}(G,\mathbb{F}_2)$ is twice the minimum number of tricliques whose symmetric difference of edge sets is $E$. Additionally, we provide a set of upper bounds on $c_2(G)$ in terms of the order, size, and vertex cover number of $G$. Finally, we show that the class of graphs with $c_2(G)\leq k$ is hereditary and finitely defined. For odd $k$, the sets of minimal forbidden induced subgraphs are the same as those for the property $\operatorname{mr}(G,\mathbb{F}_2)\leq k$, and we exhibit this set for $c_2(G)\leq2$.
The Impact of GSM towers in Radio Astronomy
Creators: name: Sihlangu, Isaac
name: Oozeer, Nadeem
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Radio astronomy is a specialised area of astronomy that examines the radio emissions from astronomical bodies within the electromagnetic spectrum's radio range. As radio telescopes have become increasingly sensitive due to technological advancements, radio astronomers face the significant challenge of reducing the impact of human-generated radio interference. Our research delved into the impact of Global System for Mobile Communication (GSM) signals on radio astronomy data, utilising a multidimensional framework approach with a probabilistic basis. We discovered a link between the location of cell towers in the nearby towns surrounding MeerKAT and a high probability of Radio Frequency Interference (RFI). However, we found no statistically significant association between the time of day and RFI occurrence at the 68% confidence level.
description: 2023 IEEE Radio and Antenna Days of the Indian Ocean (RADIO)
Asciburgium. Ein Ausgrabungs- und Beobachtungs-Bericht
Creators: name: Boschheidgen, Hermann
Publisher: name: Bonner Jahrbücher
Year: 2017

description: [nicht vorhanden / not available]
description: Bonner Jahrbücher, Bd. 104 (1899): Bonner Jahrbücher : Jahrbücher des Vereins von Altertumsfreunden im Rheinlande
title: Μελέτη της λειτουργίας και της απόδοσης αντλιών θερμότητας από ιστορικά δεδομένα πραγματικής λειτουργίας τους
Creators: name: Σαββάκος Χαράλαμπος
Publisher: name: Technical University of Crete
Year: 2010

description: Μη διαθέσιμο
Balancing Wind and Batteries: Towards Predictive Verification of Smart Grids
Creators: name: Badings, Thom S.
name: Hartmanns, Arnd
name: Jansen, Nils
name: Suilen, Marnix
Publisher: name: arXiv
Year: 2021
Subjects: subject: Systems and Control (eess.SY)
subject: FOS: Electrical engineering, electronic engineering, information engineering

description: We study a smart grid with wind power and battery storage. Traditionally, day-ahead planning aims to balance demand and wind power, yet actual wind conditions often deviate from forecasts. Short-term flexibility in storage and generation fills potential gaps, planned on a minutes time scale for 30-60 minute horizons. Finding the optimal flexibility deployment requires solving a semi-infinite non-convex stochastic program, which is generally intractable to do exactly. Previous approaches rely on sampling, yet such critical problems call for rigorous approaches with stronger guarantees. Our method employs probabilistic model checking techniques. First, we cast the problem as a continuous-space Markov decision process with discretized control, for which an optimal deployment strategy minimizes the expected grid frequency deviation. To mitigate state space explosion, we exploit specific structural properties of the model to implement an iterative exploration method that reuses pre-computed values as wind data is updated. Our experiments show the method's feasibility and versatility across grid configurations and time scales.
title: Study and implementation of distributed asynchronous algorithms for convex optimization
title: Μελέτη και υλοποίηση σε κατανεμημένα περιβάλλοντα ασύγχρονων αλγορίθμων κυρτής βελτιστοποίησης
Creators: name: Σταυριανουδακη Θαλεια-Αναστασια
Publisher: name: Technical University of Crete
Year: 2018

description: We consider a convex optimization problem with a quadratic cost function. We
partition the data of the problem into a set of processors. We use the Message Passing Interface (MPI) and develop parallel implementations of two iterative methods for the solution of the optimization problem, the Gradient Descent and the Block Coordinate Descent (BCD). We test the convergence properties of the algorithms under various circumstances, by calculating the speed of convergence and the total communication cost.
title: Polar coding for the binary erasure channel
title: Πολική κωδικοποίηση για το δυαδικό κανάλι διαγραφής
Creators: name: Αντωνιου Ελενη
Publisher: name: Technical University of Crete
Year: 2018

description: In this thesis, we present the basic principles of polar coding for the binary erasure channel. We explain the process of channel polarization and demonstrate that polar coding is capacity achieving. Then, we present efficient techniques for the coding process, two different implementations of the successive decoder, and an efficient method for the construction of the code (i.e., the selection of the virtual channels that will carry the useful information). Finally, we show how polar coding can be used for the degraded broadcast channel to transmit public data to two receivers and private data to one of them.
title: Gesture recognition for sentence synthesis with probabilistic algorithms
title: Αναγνώριση χειρονομιών για σύνθεση προτάσεων με πιθανοτικούς αλγόριθμους
Creators: name: Γιαννελος Ευαγγελος
Publisher: name: Technical University of Crete
Year: 2018

description: The purpose of this work was to develop a standalone system that predicts
text and outputs speech synthesis for people with physical disabilities and
reduced fine motor function. A low-cost, infrared hand tracking device was
utilized, typically used in virtual/augmented reality applications. The implemented
system offers two basic functionalities. First, a human-computer
interaction (HCI) functionality that is customizable and offers enough features
that can be tailored to a large number of different users. Second, a way
to predict what the user intends to write in order to reduce the user’s input
text as much as possible, speeding up overall communication. The word
prediction task was mainly based on n-grams (and relevant Markov Chains),
abbreviation expansion (and lookup tables) and recurrent neural networks.
Evaluation results confirmed that the simple prediction methods utilized accelerated
word typing speed, saving input text by approximately 63%. Future
work could utilize additional eye-tracking or hand-tracking sensors.
Towards Explainable Exploratory Landscape Analysis: Extreme Feature Selection for Classifying BBOB Functions
Creators: name: Renau, Quentin
name: Dreo, Johann
name: Doerr, Carola
name: Doerr, Benjamin
Publisher: name: arXiv
Year: 2021
Subjects: subject: Neural and Evolutionary Computing (cs.NE)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Facilitated by the recent advances of Machine Learning (ML), the automated design of optimization heuristics is currently shaking up evolutionary computation (EC). Where the design of hand-picked guidelines for choosing a most suitable heuristic has long dominated research activities in the field, automatically trained heuristics are now seen to outperform human-derived choices even for well-researched optimization tasks. ML-based EC is therefore not any more a futuristic vision, but has become an integral part of our community. A key criticism that ML-based heuristics are often faced with is their potential lack of explainability, which may hinder future developments. This applies in particular to supervised learning techniques which extrapolate algorithms' performance based on exploratory landscape analysis (ELA). In such applications, it is not uncommon to use dozens of problem features to build the models underlying the specific algorithm selection or configuration task. Our goal in this work is to analyze whether this many features are indeed needed. Using the classification of the BBOB test functions as testbed, we show that a surprisingly small number of features -- often less than four -- can suffice to achieve a 98\% accuracy. Interestingly, the number of features required to meet this threshold is found to decrease with the problem dimension. We show that the classification accuracy transfers to settings in which several instances are involved in training and testing. In the leave-one-instance-out setting, however, classification accuracy drops significantly, and the transformation-invariance of the features becomes a decisive success factor.
description: To appear in the proceedings of the 24th International Conference, EvoApplications 2021 Data used in this paper is available at https://doi.org/10.5281/zenodo.4449934
Quantized Abelian principal connections on Lorentzian manifolds
Creators: name: Benini, Marco
name: Dappiaggi, Claudio
name: Schenkel, Alexander
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Differential Geometry (math.DG)
subject: FOS: Physical sciences
subject: FOS: Mathematics
subject: 81T20, 81T05, 81T13, 53Cxx

description: We construct a covariant functor from a category of Abelian principal bundles over globally hyperbolic spacetimes to a category of *-algebras that describes quantized principal connections. We work within an appropriate differential geometric setting by using the bundle of connections and we study the full gauge group, namely the group of vertical principal bundle automorphisms. Properties of our functor are investigated in detail and, similar to earlier works, it is found that due to topological obstructions the locality property of locally covariant quantum field theory is violated. Furthermore, we prove that, for Abelian structure groups containing a nontrivial compact factor, the gauge invariant Borchers-Uhlmann algebra of the vector dual of the bundle of connections is not separating on gauge equivalence classes of principal connections. We introduce a topological generalization of the concept of locally covariant quantum fields. As examples, we construct for the category of principal U(1)-bundles two natural transformations from singular homology functors to the quantum field theory functor that can be interpreted as the Chern class and the electric charge. In this case we also prove that the electric charges can be consistently set to zero, which yields another quantum field theory functor that satisfies all axioms of locally covariant quantum field theory.
description: 26 pages, no figures, sections 2-7 improved, typos corrected, bibliography upgraded, to appear on Comm. Math. Phys
The freeness of ideal subarrangements of Weyl arrangements
Creators: name: Abe, Takuro
name: Barakat, Mohamed
name: Cuntz, Michael
name: Hoge, Torsten
name: Terao, Hiroaki
Publisher: name: arXiv
Year: 2013
Subjects: subject: Combinatorics (math.CO)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics
subject: 32S22, 17B22, 05A18

description: A Weyl arrangement is the arrangement defined by the root system of a finite Weyl group. When a set of positive roots is an ideal in the root poset, we call the corresponding arrangement an ideal subarrangement. Our main theorem asserts that any ideal subarrangement is a free arrangement and that its exponents are given by the dual partition of the height distribution, which was conjectured by Sommers-Tymoczko. In particular, when an ideal subarrangement is equal to the entire Weyl arrangement, our main theorem yields the celebrated formula by Shapiro, Steinberg, Kostant, and Macdonald. Our proof of the main theorem heavily depends on the theory of free arrangements and thus greatly differs from the earlier proofs of the formula.
description: Changes are in Section 4. Results are unchanged
Ising Model Selection Using $\ell_{1}$-Regularized Linear Regression: A Statistical Mechanics Analysis
Creators: name: Meng, Xiangming
name: Obuchi, Tomoyuki
name: Kabashima, Yoshiyuki
Publisher: name: arXiv
Year: 2021
Subjects: subject: Machine Learning (cs.LG)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences
subject: FOS: Physical sciences

description: We theoretically analyze the typical learning performance of $\ell_{1}$-regularized linear regression ($\ell_1$-LinR) for Ising model selection using the replica method from statistical mechanics. For typical random regular graphs in the paramagnetic phase, an accurate estimate of the typical sample complexity of $\ell_1$-LinR is obtained. Remarkably, despite the model misspecification, $\ell_1$-LinR is model selection consistent with the same order of sample complexity as $\ell_{1}$-regularized logistic regression ($\ell_1$-LogR), i.e., $M=\mathcal{O}\left(\log N\right)$, where $N$ is the number of variables of the Ising model. Moreover, we provide an efficient method to accurately predict the non-asymptotic behavior of $\ell_1$-LinR for moderate $M, N$, such as precision and recall. Simulations show a fairly good agreement between theoretical predictions and experimental results, even for graphs with many loops, which supports our findings. Although this paper mainly focuses on $\ell_1$-LinR, our method is readily applicable for precisely characterizing the typical learning performances of a wide class of $\ell_{1}$-regularized $M$-estimators including $\ell_1$-LogR and interaction screening.
description: Accepted to NeurIPS 2021. Camera-ready version with supplementary materials
title: Data analytics with differential privacy
title: Ανάλυση δεδομένων με διαφορική ιδιωτικότητα
Creators: name: Διγαλακης Βασιλειος
Publisher: name: Technical University of Crete
Year: 2018

description: Differential privacy is the state-of-the-art definition for privacy, that “addresses the paradox of learning nothing about an individual while learning useful information about a population”. In other words, differential privacy guarantees that any analysis performed on a sensitive dataset leaks no information about the individuals whose data are contained therein. In this thesis, we develop differentially private algorithms to analyze distributed and streaming data.
Die Rostocker Theologen Quistorp des 17. und 18. Jahrhunderts im Spiegel ihrer Familienbibel
Creators: name: Heuser, Peter Arnold
name: Rektorat
Publisher: name: Universität Rostock
Year: 2021
Subjects: subject: 943 General history of Europe Central Europe Germany

description: Vom Rostocker Stamm der Quistorps, deren familienbezogene Aufzeichnungen in der Familienbibel zwischen 1619 und 1766 die vorliegende Publikation untersucht und historisch einordnet, stammen alle heutigen Familienmitglieder ab. [...] Die Edition beleuchtet das Wirken der Familie, ihre Handlungs(spiel)räume und Handlungsoptionen in Territorium, Stadt, Kirche und Universität. Sie zeigt damit am Beispiel dieser Theologenfamilie, wie im Rostock des 17. und 18. Jahrhunderts die vielfältigen Verknüpfungen und das Zusammenwirken von Rats-, Kirchen- und Universitätsfamilien zu einer gedeihlichen Stadtentwicklung beitragen konnten.
Karlingisches Gräberfeld in Andernach
Creators: name: Koenen, Constantin
Publisher: name: Bonner Jahrbücher
Year: 2017

description: [nicht vorhanden / not available]
description: Bonner Jahrbücher, Bd. 105 (1900): Bonner Jahrbücher : Jahrbücher des Vereins von Altertumsfreunden im Rheinlande
Instructional Strategies that Foster Effective Problem-Solving
Creators: name: Singh, Chandralekha
name: Maries, Alexandru
name: Heller, Kenneth
name: Heller, Patricia
Publisher: name: arXiv
Year: 2023
Subjects: subject: Physics Education (physics.ed-ph)
subject: FOS: Physical sciences

description: Helping students become proficient problem solvers is a major goal of many physics courses from introductory to advanced levels. In fact, physics has often been used by cognitive scientists to investigate the differences between the problem-solving strategies of expert and novice problem solvers because it is a domain in which there is reasonably good agreement about what constitutes good problem-solving. Since the laws of physics are encapsulated in compact mathematical form, becoming an expert physics problem solver entails learning to unpack and interpret those physical laws as well as being able to apply them in diverse situations while solving problems. A physics expert must have a well-organized knowledge structure of relevant physics and math concepts and be able to manage cognitive load and do metacognition while solving complex problems. In this chapter, we review foundational research on expertise in physics problem-solving and then discuss research on instructional strategies that promote effective problem-solving as well as challenges in changing the instructional practices of physics instructors and teaching assistants via professional development to promote and support effective problem-solving approaches.
description: 34 pages, 3 figures
A New Doctrine for Hardware Security
Creators: name: Hastings, Adam K.
name: Sethumadhavan, Simha
Publisher: name: Columbia University
Year: 2020
Subjects: Computers
Computer security
Computers--Economic aspects

description: In recent years, high-profile hardware attacks have brought attention to the importance of and inadequate state of hardware security. Hardware security remains an elusive challenge because like other areas of security, it is an abnormal good where the economic laws of the free market fail to produce optimal outcomes. Correcting such marketplace failures is generally the role of government or other regulatory agencies and has been proposed and even implemented in some areas of security. However, little if no comparable work has been done in the realm of computer hardware. One explanation for this is that unlike other areas of security, we lack a comprehensive intellectual framework for discussing and reasoning about hardware security. We find that previous doctrines of security either do not apply or offer an incomplete perspective in this domain. We propose a new doctrine of hardware security based on the idea that achieving security is a burden, and that this burden must be shared between all the players in the game of security. Our doctrine serves as a tool for conceptualizing and understanding how hardware security should be regulated and administered.
Élite. Cultura italiana e statunitense tra Settecento e Novecento
Creators: name: Faedda, Barbara
Publisher: name: Columbia University
Year: 2020
Subjects: Cultural relations
Intercultural communication
Elite (Social sciences)
Founding Fathers of the United States

description: Between the 18th and 20th centuries, books, letters and diaries crossed the Atlantic just as intellectuals, diplomats and scientists did, when the transoceanic voyage was a risky adventure that took weeks. Prominent figures, representing the intellectual, cultural and political landscape of the two countries, tell this story of mutual discovery and knowledge between Italy and the United States. The readings and correspondence of the Founding Fathers, the writings of Italian exiles in America, the diaries of the Americans on the Grand Tour and the first libraries of Italian collections in the United States effectively reveal the details of the very special relationship that Italy and the United States have built and nurtured over the centuries. A relationship full of numerous implications and sometimes unpredictable developments.
Leptogenesis in an extended seesaw model with $U(1)_{B-L}$ symmetry
Creators: name: Dey, Ujjal Kumar
name: Jha, Tapoja
name: Mukherjee, Ananya
name: Sahoo, Nirakar
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We have explored an extended seesaw model accommodating a keV sterile neutrino adopting $U(1)_{B-L}$ symmetry. This model provides a natural platform for achieving resonant leptogenesis to account for the observed baryon asymmetry of the Universe. The required lepton asymmetry is sourced by the CP violating decay of the lightest heavy right handed neutrino to Standard Model leptons and Higgs. The presence of the light sterile neutrino in the model brings out an enhancement in the final lepton asymmetry through an additional self-energy contribution. Adopting a proper treatment for all the washout processes this framework strictly favors a strong washout regime thereby protecting the low energy neutrino mass parameters in agreement with the present neutrino and cosmology data. This framework of extended seesaw scheme offers the source of matter-antimatter asymmetry without any severe fine tuning of the Yukawa couplings governing the tiny neutrino mass. We also comment on the half-life period for the neutrino less double beta decay process in the background of having a keV sterile neutrino satisfying all the constraints which guide the explanation for the observed baryon asymmetry of the Universe.
description: 32 pages, 13 figures, 4 tables; updated references; new discussions added; matches published version
title: Optimal sizing of a microgrid including renewable energy sources
title: Μελέτη βέλτιστου σχεδιασμού του μεγέθους μικρού ηλεκτρικού δικτύου που περιλαμβάνει ανανεώσιμες πηγές ενέργειας
Creators: name: Βεριγου Σοφια
Publisher: name: Technical University of Crete
Year: 2018

description: In recent years, an increasing energy demand from a continuously growing population, combined with the advancement of greenhouse gasses (GHG) emissions and the depletion of fossil fuels have motivated the introduction of renewable energy systems (RESs) in a variety of disciplines and scales. As a consequence, the energy sector is facing a transition from a centralized network, composed of large and controllable power plants, to a decentralized grid, based on RESs. Within this framework, microgrids (MGs) provide a key solution to integrate each element of the grid, regardless of their operation status, either in a grid-connected or in an islanded mode. This study combines different RESs in order to create a functional power system which is able to cover the load of an autonomous small island, without the use of conventional energy sources. In more detail, the proposed model consists of photovoltaic (PV) panels and hydro turbines, a battery energy storage system (BESS) and a load. The main objective of this thesis is to present the optimal size of each component through an optimization software (HOMER).   Moreover, in order to facilitate the ability to adjust generation of load demand overtime, the simulation of four load prediction scenarios for the next five, ten and twenty five years is exercised with the HOMER software, while providing the optimal sizing of the PV subsystem and BESS in all cases (and generators in two scenarios), in regard to the simultaneous financial and energy load coverage optimization. The simulations conducted in the present study support our initial hypothesis, indicating that a small network can be electrically efficient and autonomous, without the need of the main grid to support it or the use of conventional energy sources, deemed as harmful as they could be to the environment, depending on the increase of the load demand.
Der Neanderthalschädel
Creators: name: Schwalbe, G.
Publisher: name: Bonner Jahrbücher
Year: 2017

description: [nicht vorhanden / not available]
description: Bonner Jahrbücher, Bd. 106 (1901): Bonner Jahrbücher : Jahrbücher des Vereins von Altertumsfreunden im Rheinlande
title: Flights Search System
title: Σύστημα Αναζήτησης Πτήσεων
Creators: name: Ζουκας Κωνσταντινος
Publisher: name: Technical University of Crete
Year: 2018

description: Η εργασία βασίστηκε στην ιδέα της ανάπτυξης ενός λογισμικού συστήματος για την αποτε- λεσματική και ευφυή αναζήτηση οικονομικών εισιτηρίων για αεροπορικές διαδρομές. Η πρω- τοτυπία της εφαρμογής έγκειται στη χρήση τεχνικών διαδικτυακής εξόρυξης (web scraping) για την ανάλυση των πληροφοριακών σελίδων υφιστάμενων πλατφορμών κρατήσεων αερο- πορικών εισιτηρίων και την εξόρυξη δεδομένων από αυτές. Παράλληλα, η εφαρμογή επε- κτείνει την επερώτηση ενός χρήστη, προτείνοντας όχι μόνο εισιτήρια για απευθείας πτήσεις, αλλά και για εναλλακτικές πτήσεις με ενδιάμεσους σταθμούς. Οι ενδιάμεσοι σταθμοί προσ- διορίζονται από τον χρήστη με βάση το μέγεθος των αεροδρομίων τους και την απόστασή τους από τον αρχικό και τον τελικό προορισμό.
Η επαύξηση της λειτουργικότητας οδηγεί στην αυτοματοποιημένη ανάκτηση επιπλέον ιστο- σελίδων από πλατφόρμες κρατήσεων, ώστε ο μηχανισμός web scraping να ανακτά τιμές ει- σιτηρίων και για τα επιμέρους σκέλη της διαδρομής.
Για την υλοποίηση της εφαρμογής χρησιμοποιήθηκαν προγραμματιστικές τεχνικές και τε- χνολογίες αιχμής, ώστε οι αναζητήσεις να διεκπεραιώνονται στον ελάχιστο δυνατό χρόνο και να μην καταναλώνονται αυξημένοι υπολογιστικοί πόροι.
Χρησιμοποιήθηκαν τεχνολογίες ασύγχρονου προγραμματισμού στο διακομιστή, RESTful διαδικτυακές υπηρεσίες για πρόσβαση στις λειτουργίες από το πρόγραμμα – πελάτη, καθώς και NoSQL βάση δεδομένων για την αποθήκευση και ανάλυση των δεδομένων των πτήσεων.
Τέλος, έλαβαν χώρα επιτυχημένες δοκιμές όσον αφορά τη λειτουργικότητα της πλατφόρμας με την χρήση δεδομένων από εμπορικά διαθέσιμο ιστότοπο εύρεσης αεροπορικών εισιτη- ρίων.
Deplatzierte Bilder. Moderne Schauplätze der Kunst / Images déplacées. Scènes modernes de Vart
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
Neural tensor contractions and the expressive power of deep neural quantum states
Creators: name: Sharir, Or
name: Shashua, Amnon
name: Carleo, Giuseppe
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: Machine Learning (cs.LG)
subject: Neural and Evolutionary Computing (cs.NE)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: We establish a direct connection between general tensor networks and deep feed-forward artificial neural networks. The core of our results is the construction of neural-network layers that efficiently perform tensor contractions, and that use commonly adopted non-linear activation functions. The resulting deep networks feature a number of edges that closely matches the contraction complexity of the tensor networks to be approximated. In the context of many-body quantum states, this result establishes that neural-network states have strictly the same or higher expressive power than practically usable variational tensor networks. As an example, we show that all matrix product states can be efficiently written as neural-network states with a number of edges polynomial in the bond dimension and depth logarithmic in the system size. The opposite instead does not hold true, and our results imply that there exist quantum states that are not efficiently expressible in terms of matrix product states or PEPS, but that are instead efficiently expressible with neural network states.
Bibliothek / Bibliothèque
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
ConViT: Improving Vision Transformers with Soft Convolutional Inductive Biases
Creators: name: d'Ascoli, Stéphane
name: Touvron, Hugo
name: Leavitt, Matthew
name: Morcos, Ari
name: Biroli, Giulio
name: Sagun, Levent
Publisher: name: arXiv
Year: 2021
Subjects: subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: Machine Learning (stat.ML)
subject: FOS: Computer and information sciences

description: Convolutional architectures have proven extremely successful for vision tasks. Their hard inductive biases enable sample-efficient learning, but come at the cost of a potentially lower performance ceiling. Vision Transformers (ViTs) rely on more flexible self-attention layers, and have recently outperformed CNNs for image classification. However, they require costly pre-training on large external datasets or distillation from pre-trained convolutional networks. In this paper, we ask the following question: is it possible to combine the strengths of these two architectures while avoiding their respective limitations? To this end, we introduce gated positional self-attention (GPSA), a form of positional self-attention which can be equipped with a ``soft" convolutional inductive bias. We initialise the GPSA layers to mimic the locality of convolutional layers, then give each attention head the freedom to escape locality by adjusting a gating parameter regulating the attention paid to position versus content information. The resulting convolutional-like ViT architecture, ConViT, outperforms the DeiT on ImageNet, while offering a much improved sample efficiency. We further investigate the role of locality in learning by first quantifying how it is encouraged in vanilla self-attention layers, then analysing how it is escaped in GPSA layers. We conclude by presenting various ablations to better understand the success of the ConViT. Our code and models are released publicly at https://github.com/facebookresearch/convit.
Lehre der Wissenschaftlerinnen und Wissenschaftler / Enseignement des chercheurs
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
Radiative Generation of Non-zero $θ_{13}$ in MSSM with broken $A_4$ Flavor Symmetry
Creators: name: Borah, Manikanta
name: Borah, Debasish
name: Das, Mrinal Kumar
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the renormalization group effects on neutrino masses and mixing in Minimal Supersymmetric Standard Model (MSSM) by considering a $μ-τ$ symmetric mass matrix at high energy scale giving rise to Tri-Bi-Maximal (TBM) type mixing. We outline a flavor symmetry model based on $A_4$ symmetry giving rise to the desired neutrino mass matrix at high energy scale. We take the three neutrino mass eigenvalues at high energy scale as input parameters and compute the neutrino parameters at low energy by taking into account of renormalization group effects. We observe that the correct output values of neutrino parameters at low energy are obtained only when the input mass eigenvalues are large $|m_{1,2,3}| = 0.08-0.12$ eV with a very mild hierarchy of either inverted or normal type. A large inverted or normal hierarchical pattern of neutrino masses is disfavored within our framework. We also find a preference towards higher values of $\tanβ$, the ratio of vacuum expectation values (vev) of two Higgs doublets in MSSM in order to arrive at the correct low energy output. Such a model predicting large neutrino mass eigenvalues with very mild hierarchy and large $\tanβ$ could have tantalizing signatures at oscillation, neutrino-less double beta decay as well as collider experiments.
description: Version 2: 30 pages, 20 figures, Major Revision, to appear in Nucl. Phys. B
title: Aναζητώντας νέες εκδοχές ελληνικότητας στην Αρχιτεκτονική με όχημα το διάλογο Σεφέρη - Τσάτσου
title: Seeking new versions of hellenism in Architecture using as reference Seferis – Tsatsos dialogue
Creators: name: Κοψαλη Ευθυμια
Publisher: name: Technical University of Crete
Year: 2019

description: Σκοπός της εργασίας είναι η αναζήτηση νέων εκδοχών ελληνικότητας στην αρχιτεκτονική, την πόλη και την τέχνη την περίοδο του ελληνικού Μεσοπολέμου μέσω της αναγωγής των θεωρητικών θέσεων για την ελληνικότητα από το πεδίο των γραμμάτων όπως αυτές αναφύονται στο Διάλογο Σεφέρη – Τσάτσου στο πεδίο της αρχιτεκτονικής, πόλης και τέχνης. Παρότι το ζήτημα της ελληνικότητας και η σχέση της νεοελληνικής Αρχιτεκτονικής την περίοδο του Μεσοπολέμου έχει θιγεί και έχει αποτελέσει αντικείμενο ερευνητικών και διδακτορικών μελετών, απόπειρες συσχετισμού περισσότερων πνευματικών και καλλιτεχνικών συμπορεύσεων που αναζητούν ενδεχομένως νέες εκδοχές της ελληνικότητας στην αρχιτεκτονική, σπανίζουν. Το κενό αυτό επιχειρεί να διαπραγματευθεί  η παρούσα ερευνητική εργασία. Ο Κωνσταντίνος Τσάτσος παρουσιάζει μια πιο στατική αντίληψη για την έννοια της ελληνικότητας, γεγονός που  βαίνει αντίθετα στις προσδοκίες της γενιάς του ’30 , που φιλοδοξούσε να δώσει στους Έλλησες την εθνική τους ταυτότητα και να τονίσει την πολιτισμική τους ετερότητα. Αν, επομένως, η ελληνικότητα θεωρούνταν κάτι το δεδομένο και συντελεσμένο, τότε όλοι οι φιλόδοξοι οραματισμοί των νέων της εποχής του ’30 θα έπεφταν στο κενό. Με άλλα λόγια το ότι η εθνική φυσιογνωμία και η ελληνικότητα δεν ήταν ακόμη αποκρυσταλλωμένες, εξυπηρετούσε τις μεγαλεπήβολες διαθέσεις της γενιάς του ’30 να νομοθετήσει. Ταυτόχρονα πρέπει να σημειώσουμε ότι ο Σεφέρης, αποφεύγει την λέξη ελληνικότητα, γιατί εμπεριείχε την απαίτηση για ιθαγένεια και προτιμά τον όρο ελληνισμός, που αντιπροσώπευε κυρίως την ιστορική και πνευματική παράδοση. Και αυτή είναι μια καίρια προτίμηση, η οποία δεν προσέχτηκε από όσους βιάστηκαν να ταυτίσουν συλλήβδην τη λεγόμενη γενιά του ’30 με την ελληνικότητα., παρόλο που ο Θεοτοκάς, έστω και αργά, προειδοποιεί για τη διαφορά. Στο παραγόμενο έργο της αρχιτεκτονικής και της τέχνης του μεσοπολέμου, θα μπορούσαμε να πούμε,  οι δύο αυτές θέσεις βρίσκουν αντίκτυπο. Σε μια προσπάθεια άμεσου αντικατοπτρισμού, τόσο η πιο «συντηρητική» εκδοχή του Κ. Τσάτσου για την έννοια της ελληνικότητας, όσο και η πιο «μοντέρνα» άποψη του Γ. Σεφέρη αποτελούν χαρακτηριστικό παράδειγμα της αναζήτησης της ταυτότητας την εποχή εκείνη.
CO2-switchable surfactant-free microemulsion consisted of N,N-dimethylcyclohexylamine, ethanol and water
Creators: name: Xu, Daixue
name: Lu, Hongsheng
name: Liu, Dongfang
name: Li, Xiaojiang
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biophysics
subject: Medicine
subject: Physiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 69999 Biological Sciences not elsewhere classified

description: N,N-Dimethylcyclohexylamine—a switchable-hydrophilicity solvent, ethanol and water could be used to prepare a CO2-switchable surfactant-free microemulsion (SFME). The ternary phase diagram was used to investigate the phase behavior of SFME. The electrical conductivity measurement, UV-visible spectra were used to investigate the microstructure and structural transition of SFME. Dynamic light scattering could be used to measure the diameter of SFME. The above results indicated that the microemulsion existed three microstructures: water-in-DMCHA (W/O), bicontinuous, and DMCHA-in-water (O/W). The variation tendency of electrical conductivity of SFME while CO2 and N2 alternately passing through was determinate, which proved SFME has excellent CO2-switchable performance. Residual oil rate that using the W/O SFME to clean oily drill cuttings is very low, and oil from cuttings can be recycled, which shows CO2-switchable SFME has much significance in washing oily drill cuttings.