Hasil untuk "Medieval history"

F. Lomoc, N. Canosa, A. P. Boette et al.

We present a method for analyzing general time series by employing the history state formalism of quantum mechanics. This formalism allows us to describe a complete evolution based on a single quantum state, the history state, which simultaneously includes -also as a quantum system- the reference clock. It naturally leads to the concept of system-time entanglement, with the ensuing entanglement entropy constituting a measure of the effective number of distinguishable states visited in the history. Through a quantum coherent state embedding of the time series data, it is then possible to associate a quantum history state to the series. The gaussian overlap between these coherent states provides thus a smooth measure of distinguishability between the series data. The eigenvalues of the corresponding overlap matrix determine in fact the entanglement spectrum and entropy of the history state, which provide a rigorous characterization of the evolution. As illustration, the formalism is applied to typical financial time-series data. Through the entanglement entropy and spectrum, different evolution regimes can be identified. Entanglement based volatility indicators are also derived, and compared with standard volatility measures.

Annie Yang

Extended reality can weave together the fabric of the past, present, and future. A two-day design hackathon was held to bring the community together through a love for history and a common goal to use technology for good. Through interviewing an influential community elder, Emile Pitre, and referencing his book Revolution to Evolution, my team developed an augmented reality artifact to tell his story and preserve on revolutionary's legacy that impacted the University of Washington's history forever.

Francisco Calderón

Algebraic quantum field theory (AQFT) puts forward three "causal axioms" that aim to characterize the theory as one that implements relativistic causation: the spectrum condition, microcausality, and primitive causality. In this paper, I aim to show, in a minimally technical way, that none of them fully explains the notion of causation appropriate for AQFT because they only capture some of the desiderata for relativistic causation I state or because it is often unclear how each axiom implements its respective desideratum. After this diagnostic, I will show that a fourth condition, local primitive causality (LPC), fully characterizes relativistic causation in the sense of fulfilling all the relevant desiderata. However, it only encompasses the virtues of the other axioms because it is implied by them, as I will show from a construction by Haag and Schroer (1962). Since the conjunction of the three causal axioms implies LPC and other important results in QFT that LPC does not imply, and since LPC helps clarify some of the shortcomings of the three axioms, I advocate for a holistic interpretation of how the axioms characterize the causal structure of AQFT against the strategy in the literature to rivalize the axioms and privilege one among them.

Gargi Bakshi, Rushikesh K. Joshi

Dynamic changes in processes necessitate the notion of state equivalence between the old and new workflows. In several cases, the history of the workflow to be migrated provides sufficient context for a meaningful migration. In this paper, we present an algorithm to find the equivalence mapping for states from the old workflow to the new one using a trail-based consistency model called history equivalence. The algorithm finds history equivalent mappings for all migratable states in the reachability graph of the process under migration. It also reports all non-migratable states that fall in the change region for a given pair of old and new Petri Nets. The paper presents the algorithm, its working, and an intuitive proof. The working is demonstrated through a couple of illustrations.

Mohammed Tayeeb Hasan, Nikolaos Tsantalis, Pouria Alikhanifard

Tracking statements in the commit history of a project is in many cases useful for supporting various software maintenance, comprehension, and evolution tasks. A high level of accuracy can facilitate the adoption of code tracking tools by developers and researchers. To this end, we propose CodeTracker, a refactoring-aware tool that can generate the commit change history for code blocks. To evaluate its accuracy, we created an oracle with the change history of 1,280 code blocks found within 200 methods from 20 popular open-source project repositories. Moreover, we created a baseline based on the current state-of-the-art Abstract Syntax Tree diff tool, namely GumTree 3.0, in order to compare the accuracy and execution time. Our experiments have shown that CodeTracker has a considerably higher precision/recall and faster execution time than the GumTree-based baseline, and can extract the complete change history of a code block with a precision and recall of 99.5% within 3.6 seconds on average.

Jens Ole Schmitt

Mario Hubert

This paper investigates the historical origin and ancestors of typicality, which is now a central concept in Boltzmannian Statistical Mechanics and Bohmian Mechanics. Although Ludwig Boltzmann did not use the word typicality, its main idea, namely, that something happens almost always or is valid for almost all cases, plays a crucial role for his explanation of how thermodynamic systems approach equilibrium. At the beginning of the 20th century, the focus on almost always or almost everywhere was fruitful for developing measure theory and probability theory. It was apparently Hugh Everett III who first mentioned typicality in physics in 1957 while searching for a justification of the Born rule in his interpretation of quantum mechanics. The historically closest concept before these developments is moral certainty, which was invented by the medieval French theologian Jean Gerson, and it became a standard concept at least until the Age of Enlightenment, when Jakob Bernoulli proved the Law of Large numbers.

Yuzanna M. Azikova

This paper analyzes the ways of reconstruction and conceptualization of the traditional organization of society and power of Kabarda in the 16th–18th centuries. This work studies features of the presentation in the generalizing works of the stage-typological characteristics of the traditional society of Kabardians in the complex of socio-spatial, socio-economic and potestary-political conditions of development. Demographic, territorial and economic factors of social and political development are emphasized as key problems, being the focus of the research attention. The inconsistency of the characteristics of the social system of medieval North Caucasian societies in historiography, presented in a summary picture of the history of “mountain feudalism”, is noted. There is a tendency to reduce the analysis of the social organization of Kabardians to the problems of “features” and “level” of development of “Kabardian feudalism”. Potestary-political identification of Kabarda in the 16th–18th centuries in the sense of organizational and governance forms of institutionalization of power is emphasized as a problem that is difficult to solve. Also, attention is drawn to the development of fruitful traditions of domestic and foreign historiography associated with the study of ancient forms of statehood and institutional alternatives and analogues to the state. Successful interpretations of the social organization of traditional Kabardian society and forms of institutionalization of power are associated with modern political anthropological concepts, within which an assessment is made of the level of development of the considered traditional and archaic communities in studying complexity of the ideological, economic, social, demographic, and territorial components.

Axel Mjærum, Ellen Kathrine Friis, Ragnar Orten Lie

A legend tells the dramatic and colourful story of the farmer Sveinung the Cruel and how he killed a dwarf (in Norwegian tusse/dverg) named Fegge in his smithy at the farm Heggtveit in Kviteseid, Norway. In the story the smithy is positioned below the hill Smiuberget (lit. Smithy Hill). During an excavation in 2020, a relatively well-preserved smithy from the 13th century was excavated at the place described in the legend. The discovery offered a unique opportunity to explore the complex and dynamic relationship between the rich record of Norwegian folklore, excavated “reality” and the history of place names. Because of this complexity, the authors argue that to seek the “real” roots of the legend is a difficult and maybe also a meaningless task. Rather, they argue that the history of Fegge`s death and other legends are valuable sources to immaterial aspects of the region’s Medieval and Renaissance metal crafting. 

Hanxun Zhong, Zhicheng Dou, Yutao Zhu et al.

Personalized dialogue systems explore the problem of generating responses that are consistent with the user's personality, which has raised much attention in recent years. Existing personalized dialogue systems have tried to extract user profiles from dialogue history to guide personalized response generation. Since the dialogue history is usually long and noisy, most existing methods truncate the dialogue history to model the user's personality. Such methods can generate some personalized responses, but a large part of dialogue history is wasted, leading to sub-optimal performance of personalized response generation. In this work, we propose to refine the user dialogue history on a large scale, based on which we can handle more dialogue history and obtain more abundant and accurate persona information. Specifically, we design an MSP model which consists of three personal information refiners and a personalized response generator. With these multi-level refiners, we can sparsely extract the most valuable information (tokens) from the dialogue history and leverage other similar users' data to enhance personalization. Experimental results on two real-world datasets demonstrate the superiority of our model in generating more informative and personalized responses.

Enrique José Ruiz Pilares, Lorenzo Lage Estrugo

El almirantazgo de Castilla desde su creación por Alfonso X vivió una profunda transformación desde un oficio de carácter militar a un cargo cortesano. En el siglo XV, cuando fue patrimonializado por el linaje de los Enríquez, sus atribuciones se circunscribían a la justicia y a la percepción de una serie de rentas en el ámbito marítimo, cuya jurisdicción “real” – y no exenta de problemas – era ejercida sobre el reino de Sevilla. Asentados en Medina del Rioseco, los Enríquez delegaron el ejercicio de su oficio en una serie de lugartenientes, en ocasiones criados, en otros casos hombres de negocios. A mediados del siglo XV, uno controló Sevilla y el territorio al norte del Guadalquivir, otro, por su parte, tenía jurisdicción al sur de este río, con sede en Jerez de la Frontera.

Andrea Gamberini

L’obiettivo di questo contributo è quello di investigare il significato di un’associazione diffusa nell’iconologia tardo‐medievale, quale quella tra Pietro Martire e Bernardino da Siena. Attraverso l’analisi di diversi casi di studio, l’autore getta una nuova luce sull’immagine di un binomio che nel corso del Quattrocento si è caricato di molteplici e differenti significati.

Jean Bernard Chatelain, Kirsten Ralf

This paper is a study of the history of the transplant of mathematical tools using negative feedback for macroeconomic stabilization policy from 1948 to 1975 and the subsequent break of the use of control for stabilization policy which occurred from 1975 to 1993. New-classical macroeconomists selected a subset of the tools of control that favored their support of rules against discretionary stabilization policy. The Lucas critique and Kydland and Prescott's time-inconsistency were over-statements that led to the "dark ages" of the prevalence of the stabilization-policy-ineffectiveness idea. These over-statements were later revised following the success of the Taylor rule.

You Wu

As a candidate of dark matter, primordial black holes (PBHs) have attracted more and more attentions as they could be possible progenitors of the heavy binary black holes (BBHs) observed by LIGO/Virgo. Accurately estimating the merger rate of PBH binaries will be crucial to reconstruct the mass distribution of PBHs. It was pointed out the merger history of PBHs may shift the merger rate distribution depending on the mass function of PBHs. In this paper, we use 10 BBH events from LIGO/Virgo O1 and O2 observing runs to constrain the merger rate distribution of PBHs by accounting the effect of merger history. It is found that the second merger process makes subdominant contribution to the total merger rate, and hence the merger history effect can be safely neglected.

Hetta Howes, James L. Smith

The articles in this Special Collection engage directly with the realities of water as they simultaneously explore its intellectual potential in various genres of medieval writing, from crusade chronicles to medieval romance. In this way they shed new light not only on the literature and history they explore but also on medieval conceptions of water more generally, paving the way for a new approach to medieval water studies. In assembling this Collection, it was the intention of the editors to reflect on the best next steps for the study of water in the Middle Ages. A new medieval water studies should be novel, critical, self-aware, global and above all inclusive. Water is more than a subject of academic research, a catalogue of tropes and idioms to be described. As fields such as ecocriticism, environmental history, geography, anthropology, archaeology and water governance have demonstrated, water is always entangled with a larger ecology. The articles in this Special Collection reveal a water that is a puzzle, but also a cipher for a variety of nuanced readings and inquiries. An overly instrumentalist and scientific mentality leads to water being studied as a passive and malleable resource, but this trend has also affected cultural and historical inquiry.

Stephen M. Wilkins, Christopher C. Lovell, Elizabeth R. Stanway

The calibrations linking observed luminosities to the star formation rate depend on the assumed stellar population synthesis model, initial mass function, star formation and metal enrichment history, and whether reprocessing by dust and gas is included. Consequently the shape and normalisation of the inferred cosmic star formation history is sensitive to these assumptions. Using v2.2.1 of the Binary Population and Spectral Synthesis (\bpass) model we determine a new set of calibration coefficients for the ultraviolet, thermal-infrared, and, hydrogen recombination lines. These ultraviolet and thermal infrared coefficients are 0.15-0.2 dex higher than those widely utilised in the literature while the H$α$ coefficient is $\sim 0.35$ dex larger. These differences arise in part due to the inclusion binary evolution pathways but predominantly reflect an extension in the IMF to 300 $M_{\odot}$ and a change in the choice of reference metallicity. We use these new coefficients to recalibrate the cosmic star formation history, and find improved agreement between the integrated cosmic star formation history and the in-situ measured stellar mass density as a function of redshift. However, these coefficients produce new tension between star formation rate densities inferred from the ultraviolet and thermal-infrared and those from H$α$.

Elizabeth Gould, Niayesh Afshordi

It has been suggested that the cosmic history might repeat in cycles, with an infinite series of similar aeons in the past and the future. Here, we instead propose that the cosmic history repeats itself exactly, constructing a universe on a periodic temporal history, which we call Periodic Time Cosmology. In particular, the primordial power spectrum, convolved with the transfer function throughout the cosmic history, would form the next aeon's primordial power spectrum. By matching the big bang to the infinite future using a conformal rescaling (a la Penrose), we uniquely determine the primordial power spectrum, in terms of the transfer function up to two free parameters. While nearly scale invariant with a red tilt on large scales, using Planck and Baryonic Acoustic Oscillation observations, we find the minimal model is disfavoured compared to a power-law power spectrum at $5.1σ$. However, extensions of $Λ$CDM cosmic history change the large scale transfer function and can provide better relative fits to the data. For example, the best fit seven parameter model for our Periodic Time Cosmology, with $w=-1.024$ for dark energy equation of state, is only disfavoured relative to a power-law power spectrum (with the same number of parameters) at $1.8σ$ level. Therefore, consistency between cosmic history and initial conditions provides a viable description of cosmological observations in the context of Periodic Time Cosmology.

Cristina D’Ancona, Gerhard Endress, Andrea Bozzi

Pablo Peñas-López, Miguel A. Parrales, Javier Rodríguez-Rodríguez et al.

The term `history effect' refers to the contribution of any past mass transfer events between a gas bubble and its liquid surroundings towards the current diffusion-driven growth or dissolution dynamics of that same bubble. The history effect arises from the (non-instantaneous) development of the dissolved gas concentration boundary layer in the liquid in response to changes in the concentration at the bubble interface caused, for instance, by variations of the ambient pressure in time. Essentially, the history effect amounts to the acknowledgement that at any given time the mass flux across the bubble is conditioned by the preceding time-history of the concentration at the bubble boundary. Considering the canonical problem of an isolated spherical bubble at rest, we show that the contribution of the history effect in the current interfacial concentration gradient is fully contained within a memory integral of the interface concentration. Retaining this integral term, we formulate a governing differential equation for the bubble dynamics, analogous to the well-known Epstein-Plesset solution. Our equation does not make use of the quasi-static radius approximation. An analytical solution is presented for the case of multiple step-like jumps in pressure. The nature and relevance of the history effect is then assessed through illustrative examples. Finally, we investigate the role of the history effect in rectified diffusion for a bubble that pulsates under harmonic pressure forcing in the non-inertial, isothermal regime.