Hasil untuk "History (General) and history of Europe"

Nadia Cooper, Carina Norregaard, Romain Meriot et al.

The 21 cm signal contains a wealth of information about the formation of the first stars and the reionization of the intergalactic medium during the Cosmic Dawn (CD) and Epoch of Reionization (EoR). The timing of these important milestones has only roughly been constrained through indirect measurements, such as from the cosmic microwave background (CMB) optical depth, and Lyman-$α$ forest. Therefore, inferring the neutral fraction over cosmic time is a goal of upcoming 21 cm experiments, such as the Square Kilometer Array (SKA). We contrast two approaches to infer astrophysical parameters and ionization history from 21 cm 2D power spectra (2DPS). We develop an emulator of the 21 cm 2DPS, trained on 21cmFAST simulations, taking into account the expected instrumental noise from the SKA and sample variance. We then perform simulation based inference (SBI) using neural posterior estimation (NPE). We compare training on datasets of noisy 2DPS obtained from 21cmFAST simulations and an emulator, to infer astrophysical parameters of interest. Using an emulator of the ionization history, which has been trained on simulations from the same astrophysical parameters, we then obtain posterior distributions of the ionization history over the redshift range z $\sim$ 5-12. We demonstrate that both methods are capable of accurately recovering the ionization history and astrophysical parameters. However, coverage tests indicate that adding emulated samples does not improve predictions. This work suggests that due to the stochastic nature of the 2DPS, using an emulator of this summary statistic may result in poorer inference.

Francesco Vissani

The concept of antimatter is extremely important, but not always discussed as it deserves, balancing ideas and formalism. In this note, we gather some insights to present it effectively, following certain steps taken in the history of knowledge; although rarely remembered, they can serve to enrich standard teaching materials. In addition to the well-known contributions of Dirac, which we place in their original context, the contributions of Pauli and especially Majorana stand out, the latter being the first to reach the modern formalism of canonical quantization. The importance of the point of view of wave mechanics emerges, which still shows its limitations, requiring some adjustments to constitute an acceptable interpretation.

Weiqin Chen, Xinjie Zhang, Dharmashankar Subramanian et al.

Transformer models (TMs) have exhibited remarkable in-context reinforcement learning (ICRL) capabilities, allowing them to generalize to and improve in previously unseen environments without re-training or fine-tuning. This is typically accomplished by imitating the complete learning histories of a source RL algorithm over a substantial amount of pretraining environments, which, however, may transfer suboptimal behaviors inherited from the source algorithm/dataset. Therefore, in this work, we address the issue of inheriting suboptimality from the perspective of dataset preprocessing. Motivated by the success of the weighted empirical risk minimization, we propose a simple yet effective approach, learning history filtering (LHF), to enhance ICRL by reweighting and filtering the learning histories based on their improvement and stability characteristics. To the best of our knowledge, LHF is the first approach to avoid source suboptimality by dataset preprocessing, and can be combined with the current state-of-the-art (SOTA) ICRL algorithms. We substantiate the effectiveness of LHF through a series of experiments conducted on the well-known ICRL benchmarks, encompassing both discrete environments and continuous robotic manipulation tasks, with three SOTA ICRL algorithms (AD, DPT, DICP) as the backbones. LHF exhibits robust performance across a variety of suboptimal scenarios, as well as under varying hyperparameters and sampling strategies. Notably, the superior performance of LHF becomes more pronounced in the presence of noisy data, indicating the significance of filtering learning histories.

Blanka Zilynská

Book review on Wojciech Świeboda, Universitas contra haeresim. Działalność antyheretycka Stanisława ze Skarbimierza jako przedstawiciela Uniwersytetu Krakowskiego Towarzystwo Naukowe Societas Vistulana, Kraków 2021, 318 s., ISBN 978-83-65548-86-3, (Historia et Monumenta Universitatis Jagellonicae VII, red. Krzysztof Ożóg)

Koun Shirai

Glass has long been considered a nonequilibrium material. The primary reason is its history-dependent properties: the obtained properties are not uniquely determined by two state variables alone, namely, temperature and volume, but are affected by the process parameters, such as cooling rates. However, closer observations show that this history dependence is common in solid; in crystal growth, the properties of an obtained crystal are affected by the preparation conditions through defect structures and metallurgical structures. The problem with the previous reasoning of history dependence lies in the lack of appropriate specification of state variables. Without knowledge of the latter, describing thermodynamic states is impossible. The guiding principle to find state variables is provided by the first law of thermodynamics. The state variables of solids have been searched by requiring that the internal energy $U$ is a state function. Detailed information about the abovementioned microstructures is needed to describe the state function $U$. This can be accomplished by specifying the time-averaged positions R_{j} of all atoms comprising the solids. Therefore, R_{j} is a state variable for solids. Defect states, being metastable states, represent equilibrium states within a finite time (relaxation time). However, eternal equilibrium is nonexistent: the perfect crystal is thermodynamically unstable. Equilibrium states can only be considered at the local level. Glass is thus in equilibrium as long as its structure does not change. The relaxation time is controlled by the energy barriers by which a structure is sustained, and this time restriction is intimately related to the definition of state variables. The most important property of state variables is their invariance to time averaging. The time-averaged quantity R_{j} meets this invariance property.

Amirhosein Ghasemabadi, Muhammad Kamran Janjua, Mohammad Salameh et al.

One key challenge to video restoration is to model the transition dynamics of video frames governed by motion. In this work, we propose TURTLE to learn the truncated causal history model for efficient and high-performing video restoration. Unlike traditional methods that process a range of contextual frames in parallel, TURTLE enhances efficiency by storing and summarizing a truncated history of the input frame latent representation into an evolving historical state. This is achieved through a sophisticated similarity-based retrieval mechanism that implicitly accounts for inter-frame motion and alignment. The causal design in TURTLE enables recurrence in inference through state-memorized historical features while allowing parallel training by sampling truncated video clips. We report new state-of-the-art results on a multitude of video restoration benchmark tasks, including video desnowing, nighttime video deraining, video raindrops and rain streak removal, video super-resolution, real-world and synthetic video deblurring, and blind video denoising while reducing the computational cost compared to existing best contextual methods on all these tasks.

John Soltis, Lehman Garrison

Using a scale-free $N$-body simulation generated with the ABACUS $N$-body code, we test the robustness of halo mass accretion histories via their convergence to self-similarity. We compare two halo finders, ROCKSTAR and COMPASO. We find superior self-similarity in halo mass accretion histories determined using ROCKSTAR, with convergence to 5% or better between $\sim10^2$ to $10^5$ particles. For COMPASO we find weaker convergence over a similar region, with at least 10% between $\sim10^2$ to $10^4$ particles. Furthermore, we find the convergence to self-similarity improves as the simulation evolves, with the largest and deepest regions of convergence appearing after the scale factor quadrupled from the time at which non-linear structures begin to form. With sufficient time evolution, halo mass accretion histories are converged to self-similarity within 5% with as few as $\sim70$ particles for COMPASO and within 2% for as few as $\sim30$ particles for ROCKSTAR.

Fengran Mo, Abbas Ghaddar, Kelong Mao et al.

In this paper, we study how open-source large language models (LLMs) can be effectively deployed for improving query rewriting in conversational search, especially for ambiguous queries. We introduce CHIQ, a two-step method that leverages the capabilities of LLMs to resolve ambiguities in the conversation history before query rewriting. This approach contrasts with prior studies that predominantly use closed-source LLMs to directly generate search queries from conversation history. We demonstrate on five well-established benchmarks that CHIQ leads to state-of-the-art results across most settings, showing highly competitive performances with systems leveraging closed-source LLMs. Our study provides a first step towards leveraging open-source LLMs in conversational search, as a competitive alternative to the prevailing reliance on commercial LLMs. Data, models, and source code will be publicly available upon acceptance at https://github.com/fengranMark/CHIQ.

Adrien de Jarmy

The development of digital humanities has opened new perspectives in the history of Islam: whether dealing with thin or sometimes vast source corpora (such as Sīra, al-Tbarī, al-Dahabī, etc.), these tools allow us to approach texts much more effectively from a statistical perspective, in order to support more general hypotheses and move beyond case studies. Drawing on the work of a number of researchers as well as our own, we propose to study the potentialities and limitations posed by computer methods for the history of medieval Islam, keeping in mind that the conclusions may prove useful to researchers of other periods. We will particularly emphasize two tools: the construction and use of relational databases, and more recently, the tagging of sources, with the stated goal of addressing some of the problems posed by the previous method.

Yegor Grebnev, Lesley Smith

Visually complex texts emerge as a response to complicated cosmological, social, or ontological phenomena in reality, and different pre-modern cultures came up with their own unique ways of re-presenting this reality in textual form. Today, with the help of digital media, it becomes possible to discuss visually complex texts from different cultures in a way that facilitates the exchange of research ideas between specialists working with different regions and languages.

Caitlin C. Doughty, Joseph F. Hennawi, Jose Oñorbe et al.

The epoch of hydrogen reionization is complete by $z=5$, but its progression at higher redshifts is uncertain. Measurements of Ly$α$ forest opacity show large scatter at $z<6$, suggestive of spatial fluctuations in neutral fraction ($x_\mathrm{HI}$), temperature, or ionizing background, either individually or in combination. However, these effects are degenerate, necessitating modeling these physics in tandem in order to properly interpret the observations. We begin this process by developing a framework for modeling the reionization history and associated temperature fluctuations, with the intention of incorporating ionizing background fluctuations at a later time. To do this, we generate several reionization histories using semi-numerical code AMBER, selecting histories with volume-weighted neutral fractions that adhere to the observed CMB optical depth and dark pixel fractions. Implementing these histories in the \texttt{Nyx} cosmological hydrodynamics code, we examine the evolution of gas within the simulation, and the associated metrics of the Ly$α$ forest opacity. We find that the pressure smoothing scale within the IGM is strongly correlated with the adiabatic index of the temperature-density relation. We find that while models with 20,000 K photoheating at reionization are better able to reproduce the shape of the observed $z=5$ 1D flux power spectrum than those with 10,000 K, they fail to match the highest wavenumbers. The simulated autocorrelation function and optical depth distributions are systematically low and narrow, respectively, compared to the observed values, but are in better agreement when the reionization history is longer in duration, more symmetric in its distribution of reionization redshifts, or if there are remaining neutral regions at $z<6$. The systematically low variance likely requires the addition of a fluctuating UVB.

Guoping Rong, Yifan Zhang, Lanxin Yang et al.

Modern code review is a critical and indispensable practice in a pull-request development paradigm that prevails in Open Source Software (OSS) development. Finding a suitable reviewer in projects with massive participants thus becomes an increasingly challenging task. Many reviewer recommendation approaches (recommenders) have been developed to support this task which apply a similar strategy, i.e. modeling the review history first then followed by predicting/recommending a reviewer based on the model. Apparently, the better the model reflects the reality in review history, the higher recommender's performance we may expect. However, one typical scenario in a pull-request development paradigm, i.e. one Pull-Request (PR) (such as a revision or addition submitted by a contributor) may have multiple reviewers and they may impact each other through publicly posted comments, has not been modeled well in existing recommenders. We adopted the hypergraph technique to model this high-order relationship (i.e. one PR with multiple reviewers herein) and developed a new recommender, namely HGRec, which is evaluated by 12 OSS projects with more than 87K PRs, 680K comments in terms of accuracy and recommendation distribution. The results indicate that HGRec outperforms the state-of-the-art recommenders on recommendation accuracy. Besides, among the top three accurate recommenders, HGRec is more likely to recommend a diversity of reviewers, which can help to relieve the core reviewers' workload congestion issue. Moreover, since HGRec is based on hypergraph, which is a natural and interpretable representation to model review history, it is easy to accommodate more types of entities and realistic relationships in modern code review scenarios. As the first attempt, this study reveals the potentials of hypergraph on advancing the pragmatic solutions for code reviewer recommendation.

Peter Bubenik

Garside et al. use event history methods to analyze topological data. We provide additional background on persistent homology to contrast the hazard estimators used by Garside et al. with traditional approaches in topological data analysis. In particular, the former is a local method, which has advantages and disadvantages, while homology is a global. We also provide more background on persistence landscapes and show how a more complete use of this statistic improves its performance.

Christopher Ull, U. Hamsen, Christina Weckwerth et al.

“Speaking through the eyes.” #Eye-tracking enables symptom identification in critically ill voiceless patients with impaired communication options and therefore may be capable of improving patient-medical team interaction and patient satisfaction. BACKGROUND Eye tracking (ET) may be a novel tool to enable nonverbal communication. We hypothesized that ET could be used successfully by intensive care unit (ICU) patients with artificial airways to express their levels of pain and mood, quality of life, and self-esteem with predefined scales and scores. METHODS Prospective, monocentric, observational study, including patients with an endotracheal tube or tracheostomy tube and a history of mechanical ventilation for more than 48 hours without delirium, and inadequate nonverbal communication skills. The ICU patients' pain was assessed with a numeric rating scale, their mood was tested with a smiley analog scale. Quality of life and self-esteem were measured with the European quality of life-5 dimensions-5 levels-score and the visual analog self-esteem scale. RESULTS A total of 75 patients with a mean age of 58.3 years were included. Main diagnoses for ICU admission were major trauma (45.3%), nonabdominal sepsis (22.6%), and acute abdomen (13.3%). Patients showed moderate levels of pain and sadness with a median of 4 (interquartile range, 3–5.5) on the numeric rating scale and a median of 4 (interquartile range, 3–4) on the smiley analog scale. The general health status on the European quality of life-5 dimensions-5 levels-score was rated as poor. Reporting on the visual analog self-esteem scale, most of the included patients felt trapped (90.7%) and not confident (72%), were frustrated (64%) or did not feel understood (56%). However, despite their severe illness, many patients classified themselves as intelligent (30.6%), not mixed up (38.6%), outgoing (38.6%), and optimistic (44%). CONCLUSION Eye tracking enables symptom identification in critically ill voiceless patients with impaired communication options. The results of our study may provide guidance for improvement measures in the care of voiceless ICU patients. We believe that ET is useful for symptom identification and therefore may be capable of improving patient-medical team interaction and patient satisfaction. LEVEL OF EVIDENCE Diagnostic Test or Criteria, Level III.

Christelle Taraud

O objetivo deste artigo é (re)pensar a(s) história(s) do tempo presente à luz das teorias feministas que, através dos conceitos de interseccionalidade, subalternidade e decolonialidade, oferecem uma visão ao mesmo tempo fecunda e renovada. No cerne da abordagem, a ideia de contornar/submergir as visões hegemônicas, totalizantes e / ou dominantes, para aclarar a contrário a pluralidade de existência(s)/experiência(s) e modalidades práticas, teóricas e simbólicas de sua(s) múltiplas expressão(ões) por meio de pluri-interpretação(ões)/reflexão(ões) pensadas de maneira horizontal (ao nível do solo, pode-se dizer) e não hierárquica(s). Aqui um multifocal de segmentos polimórficos, traços difusos e narrativas fragmentárias emergiria, formando corpo-unidade não por categorização-hierarquização fixista, mas por justaposição-coabitação lábil, propondo uma visão verdadeiramente humana e universal. Palavras-chave: teorias feministas; interseccionalidade; subalternidade; decolonialidade; feminicídio/ecocídio.

Rodica CRUDU, Mariana ZUBENSCHI, Carmen NASTASE

The topicality of the neighborhood Europeanization through ENP is undoubtful, particularly due to the fact that the Republic of Moldova has taken a claimable European integration direction and is striving to fulfill the requirements stipulated in the EU-Moldova Association Agreement. The paper aims to provide an overview of both the theoretical aspects by defining and explaining the concept of Europeanization and the background of ENP and how these concepts are practically realized in the attempt to achieve the Europeanization of the Republic of Moldova and understand what bottlenecks should be tackled in order to make a better use of this policy in its pursuit of the European goal. A special attention is allocated to the assessment of the citizen perceptions about EU in general and EU-Moldova relations in particular, common beliefs that have been created among citizens with reference to the EU and the role of the EU as a key player in the Eastern Neighbourhood in general and Europeanisation of the Republic of Moldova. A survey was applied on 173 respondents. Results show that in general Moldovan citizens have a positive belief about the EU, are aware about the EU financial support Moldova received so far and consider EU as a reliable partner from which Moldova has a lot to learn in terms of democracy, law supremacy, human rights and economic development.

S. Caini, B. Bendinelli, G. Masala et al.

Background: Lead exposure, even at low levels, is associated with adverse health effects in humans. We investigated the determinants of individual lead levels in a general population-based sample of adults from Florence, Italy. Methods: Erythrocyte lead levels were measured (using inductively coupled plasma-mass spectrometry) in 454 subjects enrolled in the Florence cohort of the European Prospective Investigation into Cancer and Nutrition (EPIC) study in 1992–1998. Multiple linear regression models were used to study the association between demographics, education and working history, lifestyle, dietary habits, anthropometry, residential history, and (among women) menstrual and reproductive history and use of exogenous sex hormones, and erythrocyte lead levels. Results: Median lead levels were 86.1 μg/L (inter-quartile range 65.5–111.9 μg/L). Male gender, older age, cigarette smoking and number of pack-years, alcohol intake, and residing in urban areas were positively associated with higher erythrocyte lead levels, while performing professional/managerial or administrative work or being retired was inversely associated with lead levels. Among women, lead levels were higher for those already in menopause, and lower among those who ever used hormone replacement therapy. Conclusions: Avoidable risk factors contribute to the lead body burden among adults, which could therefore be lowered through targeted public health measures.

Mercedes Navarro Pérez

El proyecto europeo Europeana Archaeology tiene como objetivo mejorar la cantidad y calidad del patrimonio arqueológico digital presente en la biblioteca europea (Europeana). Con este objetivo se pone de manifiesto el potencial del patrimonio arqueológico como recurso de desarrollo económico, social y cultural. El patrimonio arqueológico de Jaén muestra una riqueza amplia y variada que le hacen especialmente adecuado para su inclusión digital en Europeana. A través de este proyecto se harán visibles algunos de los bienes patrimoniales más significativos de la provincia de Jaén desde el siglo IV hasta el siglo XV presentes en la colección Patrimonio arqueológico medieval de Andalucía oriental (España).

Kristin Love Huffman

This essay focuses on an iconic and ground-breaking woodcut – Jacopo de’ Barbari (c. 1460/70–1516) and Anton Kolb’s 'View of Venice' (1500) – and an interactive museum installation that I first developed for Duke University’s Nasher Museum of Art. The exhibition uses the 'View' as a point of departure for the development of multi-media displays about Early Modern Venice and the transfer of knowledge. Adopting Aby Warburg’s illustrative terminology, the essay extends understandings of the woodcut, namely its function as an ‘image vehicle’ and its invention and realization as a product of cultural pathways. This concept, ‘pathways of culture’, also relates to the digital methods and visualized media used in the exhibition where their application advances a new methodology in art history, just as Aby Warburg did in the early twentieth century. And like Warburg who privileged visual imagery and traced its ideological transmission with his 'Mnemosyne Atlas' (1924–1929), the curatorial team of the exhibition uses and systematizes original visualizations to drive the analyses of art, architectural and urban history in new and exciting ways.

Maximilian Kreter

During the ‘refugee crisis’ Germany faced a controversial debate about asylum seekers and immigration policy fueled by a diffuse disenchantment with politics, brought to the streets by PEGIDA and represented in parliament by the AfD. This article examines the ideology expressed and the techniques applied by sentenced hate crime offenders in this debate on social media platforms, such as Facebook from 2011 to 2016.