cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Gate-tuned high frequency response of carbon nanotube Josephson junctions
Creators: name: Cleuziou, J. -P.
name: Wernsdorfer, W.
name: Andergassen, S.
name: Florens, S.
name: Bouchiat, V.
name: Ondarcuhu, Th.
name: Monthioux, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: Carbon nanotube (CNT) Josephson junctions in the open quantum dot limit exhibit superconducting switching currents which can be controlled with a gate electrode. Shapiro voltage steps can be observed under radiofrequency current excitations, with a damping of the phase dynamics that strongly depends on the gate voltage. These measurements are described by a standard RCSJ model showing that the switching currents from the superconducting to the normal state are close to the critical current of the junction. The effective dynamical capacitance of the nanotube junction is found to be strongly gate-dependent, suggesting a diffusive contact of the nanotube.
description: 14 pages, 8 figures
Drifter observations in the Northeast Pacific
Creators: name: Ukita, Jinro
Publisher: name: University of British Columbia
Year: 2010

description: From the position data of 23 drifters over the four years period, 1982 to 1985, the upper layer kinematics of the Northeast Pacific were investigated. The focus of this study was upon the topographic influence, wind forcing, and Rossby waves. The notions of homogeneity and stationarity were applied to both the Eulerian and Lagrangian analysis. A new computational scheme was proposed and tested in order to explicitly take into account the Lagrangian characteristics of the drifter data. The Eulerian analysis showed that the spatial and temporal distributions of the mean current and the mean wind stress were in good agreement. Three of the four eddy kinetic energy maxima found in the region geographically corresponded to topographic features. Also the velocity field of this region appeared to be strongly inhomogeneous, non-stationary, and anisotropic. The results from the Lagrangian analysis showed that the spectral slope for the periods shorter than 5 days followed the -2 law, and suggested that the direct wind forcing was a dominant mechanism for those periods. The spectrum of the eddy component of the velocity appeared to be white for the periods longer than 10 days. The results showed that the linear Rossby waves were not dominant mechanism for upper layer dynamics of this region. The rotary spectra illustrated some evidence of the rotational preference of the cyclonic over anti-cyclonic motions at a period of 10 days. The new scheme provided meaningful information about the eddy component of the velocity.
Generation of a mouse model for the in vivo study of HCV-host interaction
Creators: name: D'Angelo, Fulvio
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2010

description: The natural species tropism of hepatitis C virus (HCV) is limited to humans and higher primates. Due to the limited availability of chimpanzees, the establishment of a small-animal model for the study of HCV infection has a high priority. The recent identification of the human cellular receptors that are essential for HCV entry together with the advances in mouse genome engineering provides the bases for creating an inbred mouse model of HCV infection and propagation.
In our study we designed a gene targeting strategy to produce novel humanized mouse strains expressing human-specific HCV entry receptors. Human genes for HCV essential entry factors were introduced in the mouse genome by homologous recombination in murine embryonic stem cells. To achieve the native expression patterns of their murine orthologues, we adopted a knock-in approach replacing the murine genes with human coding sequences.   Three novel humanized mouse strains were generated, expressing respectively human CD81, scavenger receptor class B member 1 and occludin. Molecular analyses of mice genomic DNA and messenger RNA confirmed the presence and germ line propagation of the human genes, and their transcription.
The native regulated expression of human-specific HCV entry receptors can overcome the major block to HCV replication in murine cells. To verify the virus entry into the cells of our humanized mice, we successfully optimized isolation and culture of murine primary hepatocytes and HCV pseudotype particles infection assay. Genetic humanization of mice for species-specific HCV receptors could allow HCV glycoproteins mediated cell entry and could be an important tool for in vivo studying of virus-host interactions.
On blow-ups of projective spaces at points on a rational normal curve
Creators: name: Santana-Sanchez, Luis
Publisher: name: Loughborough University
Year: 2021
Subjects: subject: 19999 Mathematical Sciences not elsewhere classified
subject: FOS: Mathematics

description: In this thesis we study a dimensionality problem on Xn s , which denotes the blow-up of the complex projective space P n at points sitting on a rational normal curve of degree n. More precisely, we display a formula that computes the dimension of any given complete linear system of effective divisors on Xn s . This formula highlights how the dimension can be completely described by the presence of some special cycles in the base locus of the linear system. In this regard, we establish the multiplicity of containment of every special cycle in the base locus and see how it affects the dimensionality.
Broadcasting of continuous variable entanglement
Creators: name: Adhikari, Satyabrata
name: Majumdar, A. S.
name: Nayak, N.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We present a scheme for broadcasting of continuous variable entanglement. We show how an initial two-mode squeezed state of the electromagnetic field shared by two distant parties can be broadcasted into two nonlocal bipartite entangled states. Our protocol uses a local linear amplifier and a beam splitter at each end. We compute the fidelity of the output entangled states and show that the broadcasting can be implemented for a variety of input squeezed states and amplifier phases.
description: 4 pages, 2 eps figures, RevTex
Fiumi come corridoi di memorie culturali, saperi idraulici e rappresentazioni.
Creators: name: Vallerani, Francesco
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2019

description: Representing rivers as cultural memory and watery knowledge corridors
The control and management of water flows are among the most significant human activities aimed at transforming the natural environment. In this paper the main goal is to face with the possibility to recognize in hydrography not only valuable assets that are at the core of landscape management, but also more intangible aspects that could actually matter deeply to people, such as “familiarity” or the complex emotional (and often unknown) relationships that affect what is understood as “watery sense of place”. It follows that the recovery of the waterfronts is now increasingly an attractive starting point for interaction between global processes and local perspectives. This fondness for waterscapes allows to develop the concept of hydrophilia that could be defined as an ancestral attraction where physiological mechanisms of sight, smell and hearing
interact with moods, emotions and meanings. Matters concerning waterscapes representation are finally much more than specific fields of art history research, especially when considering renaissance Flanders and Italy watery iconographies. Such cultural heritage is a further opportunity for broadening the people’s awareness about the multifunctional role of fluvial sceneries.

Les rivières comme couloires de mémoire culturelle, connaissances hydrauliques et représentations
Le contrôle et la gestion des flux d’eau sont parmi les activités humaines les plus
importantes visant à transformer l’environnement naturel. Dans cet article, l’objectif principal est de considérer la possibilité de reconnaître en hydrographie non seulement des atouts précieux qui sont au coeur de la gestion du paysage, mais aussi des aspects plus intangibles qui impliquent des relations emotionnelles (et souvent inconnues) capable de définir ce qui peut être compris comme «sens aquatique du lieu». Il en résulte que la récupération des quais est de plus en plus un point de départ attrayant pour l’interaction entre les processus globaux et les perspectives locales. Ce prédilection pour les paysages aquatiques permet de développer le concept d’hydrophilie qui pourrait être défini comme une attraction ancestrale où les mécanismes physiologiques de la vue, de l’odorat et de l’ouïe interagissent avec les humeurs, les émotions et les significations. Les questions relatives à la représentation picturale des paysages aquatiques sont enfin bien plus que des domaines spécifiques de la recherche sur l’histoire de l’art, en particulier lorsque l’on considère la Renaissance en Flandre et en Italie. Un tel héritage culturel est une occasion supplémentaire de sensibiliser les populations sur le rôle multifonctionnel des paysages fluviaux.
description: Semestrale di studi e ricerche di geografia, N. 1 (2019): Scenari Fluviali: rappresentazioni, pratiche e visioni
Demand Forecast Model and Route Optimization to Improve the Supply of an SME in the Bakery Sector
Creators: name: Bazan Flores, Emory Pablo
name: Fe Gamarra, Candice Maria
name: Taquía Gutiérrez, Jose Antonio
name: García López, Yván Jesús
Publisher: name: Hannover : publish-Ing.
Year: 2023
Subjects: subject: Supply Management Improvement
subject: Demand Forecasting
subject: Clark-Wright
subject: Route Optimization
subject: ARIMA
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: This research employs the Lean Six Sigma DMAIC methodology to address enhancing product distribution efficiency in a bakery chain. Following the diagnostic phase, demand forecasting models were developed using ARIMA and Holt Winter methods, with ARIMA demonstrating higher prediction accuracy. Furthermore, route mapping was conducted using the Clark-Wright algorithm. Key performance indicators (KPIs) such as delivery time, distance traveled, and MAPE (Mean Absolute Percentage Error) will be established for process control. Implementing these improvements aims to achieve more efficient product distribution management within the bakery chain
A standard path towards scalable conferencing in the Internet
Creators: name: Amirante, Alessandro
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2010

description: The work described in this Ph.D. thesis has been carried out within the context of computer networks and real-time multimedia applications over the Internet. Specifically, we focus on conferencing, a challenging service which experienced a wide growth during the last years. We examine the standardization efforts conducted in this field by the Internet Engineering Task Force (IETF), which are mainly focused on centralized conferencing as defined by the XCON Working Group. We actively contributed to such efforts by designing and implementing the defined framework and protocols, while also writing best current practice documents which are on the path to become Request For Comments (RFCs). The main outcome of such activities has been Meetecho, a standards-compliant multimedia conferencing and collaboration platform we developed. Meetecho has been conceived at the outset to be extensible towards a distributed architecture, yet being fully compliant with the XCON specification, in order to better fulfill scalability requirements resulting from its large-scale deployment. The distributed architecture, which is the subject of the DCON (Distributed Conferencing) proposal we submitted to the IETF, is thoroughly described herein, where we also provide the reader with the results of a scalability analysis we conducted in order to assess the actual performance improvement attainable with distribution. The figures obtained have been encouraging and definitely motivated us in pushing our proposal into the Internet standardization community. Finally, a remarkable part of this dissertation is focused on diagnosing and addressing issues that might arise when deploying multimedia architectures in the actual Internet.
New peptide nucleic acids for biotechnological applications
Creators: name: Castiglione, Mariangela
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2010

description: In the present study was designed and realized a new similar to the PNA. It is a chiral nucleo-γ-peptide, dabPNA, isomer of the aegPNA unit and characterized by a 2,4-diaminobutyric acid (DABA)-based backbone carrying the carboxymethylated nucleobase on its α amino group.
Differently from aegPNA monomers, dabPNA presents a shorter backbone (3C between the nitrogen atom and the carbonyl) and an enhanced distance between the nucleobase and the backbone, i.e. 3 atoms (1N+2C) instead of 2C in aegPNAs. Furthermore, in comparison with ornPNA that binds to RNA forming a stable triplex, daba-based PNA has a methylene group less in the backbone.
To achieve dabPNA oligomers, the new monomers tL-dab, tD-dab, aL-dab and  aD-dab were synthesized in good yield using suitable protected building blocks and characterized by NMR and ESI-MS techniques.
Initially, the homothymine oligomers (tL-dab)12 and (tD-dab)6 were synthesized, using a synthetic strategy that ensured the maintenance of chirality during the coupling steps, and tested for hybridization towards natural nucleic acids. No binding evidence with both DNA (dA12) and RNA (A12) was revealed by CD and UV experiments. Furthermore, the insertion of a single tL-dab unit in the middle or at N-terminus of a homothymine aegPNA chain leads to a decreased binding efficiency to the target DNA in comparison to full aegPNA.Since dabPNAs based on L- and D-DABA don’t bind natural nucleic acids, we explored the possibility that complementary nucleopeptides based on D or L-DABA could bind between themselves. This property would be interesting in order to develop novel DABA-based dendrimeric systems, as new materials, and also to realize new diagnostic tools, as for example new molecular beacon probe. To verify this interesting possibility, the monomers aL-dab and  aD-dab were oligomerized to the homoadenine hexamers (aL-dab)6 and (aD,L-dab)6. In order to find the correct combination of chirality suitable for obtaining the binding, also the  (tD,L-dab)6  oligomer were realized to perform the hybridization studies. From CD and UV experiments, binding evidence was revealed in the case of the complementary oligomers with alternate chirality, (aD,L-dab)6 and  (tD,L-dab)6, even if the stability of the complex formed was not so high (Tm 11°C).
Furthermore, some interesting properties relative to the self-complementary oligomer (aL−dab-tD−dab)3 emerged from preliminary DLS experiments that evidenced the formation of multimeric aggregates for this system.
These results, together with the high serum stability of the DABA-based oligomers, suggest further studies on dabPNAs as new self-recognizing bio-inspired polymers, with the potentiality to develop new nanomaterials or new biotechnological tools in bioengineering and biomedical applications.
Framework For The Successful Set-up Of A Common Data Model In The Context Of An Industry 4.0-ready Plant Design Process
Creators: name: Drees, Tobias
name: Große-Kreul, Alexander
name: Syniawa, Daniel
name: Josler, Lars Niklas
name: Hypki, Alfred
name: Kuhlenkötter, Bernd
Publisher: name: Hannover : publish-Ing.
Year: 2023
Subjects: subject: Common Data Model
subject: Digital Transformation
subject: Plant Design Process
subject: Industry 4.0
subject: Data Exchange
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: The production plant design process consists of a multitude of individual engineering disciplines, which rely on a variety of digital models. The individual tasks build up on each other, while each discipline consumes information from the previous processes. However, sharing relevant data across multiple companies is challenging and susceptible to miscommunication and delays. Furthermore, integrating diverse software systems, tools, and technologies create compatibility issues and hinder seamless integration. As a result, a heterogeneous, non-automated data and information landscape is created, characterized by a high level of manual data transfer. This represents a major problem on the way towards Industry 4.0. The goal of this paper is to provide a framework for the successful set-up of a common data model in the context of an Industry 4.0-ready plant design process across and along the value chain. For this purpose, a literature review of current problems in the cross-company and cross-departmental collaboration in the plant design process is provided and requirements for the framework are derived. Existing solutions and research projects are compiled and evaluated against the requirements, from which the framework's structure is concluded. The framework itself is intended to be holistic and must therefore not only include technical aspects (e.g. data interfaces, semantics), but also enable the entire organization and value chain to implement the common data model as part of the digital transformation process (e.g. employee skills, business strategy, legal conditions). Based on this, the framework is further elaborated by deducing calls for action for a successful set-up of a common data model within the research project DIAMOND (Digital plant modeling with neutral data formats). The focus should be on employees and their competencies, as these are prerequisites for shaping digital transformation. Future research must prioritize these actions to enhance technology readiness and organizational Industry 4.0 preparation.
Unfolding a Codimension-Two, Discontinuous, Andronov-Hopf Bifurcation
Creators: name: Simpson, D. J. W.
name: Meiss, J. D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Dynamical Systems (math.DS)
subject: FOS: Mathematics
subject: 37G15

description: We present an unfolding of the codimension-two scenario of the simultaneous occurrence of a discontinuous bifurcation and an Andronov-Hopf bifurcation in a piecewise-smooth, continuous system of autonomous ordinary differential equations in the plane. We find the Hopf cycle undergoes a grazing bifurcation that may be very shortly followed by a saddle-node bifurcation of the orbit. We derive scaling laws for the bifurcation curves that emanate from the codimension-two bifurcation.
description: 19 pages, 4 figures
Improvement Proposal To Increase Productivity Of A SME In The Primary Manufacturing Sector Using Standardized Labor and TPM Tools
Creators: name: De Guzmán-Lunarejo, Diego Niño
name: Obregon-Leon, Dahana Anthuanet
name: Flores-Perez, Alberto
Publisher: name: Hannover : publish-Ing.
Year: 2023
Subjects: subject: Productivity
subject: TPM Total Productive Maintenance
subject: Preventive Maintenance
subject: Standardized Work
subject: 5S
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: The case study is situated in an SME in the primary manufacturing sector and focuses on increasing its productivity using lean manufacturing tools. First, productivity was identified at 15%, while the average for the sector was 25%, causing a negative economic impact of approximately U$301,309 per year. Through the diagnosis, it was found that the main reasons were machine downtime, caused by various factors such as unplanned downtime and maintenance; the second reason was inadequate sorting of raw material, due to the lack of standardized procedures, lack of protocols, and disorder in the sorting area. To address these problems, an improvement model was developed based on 5S tools, standardized work, and TPM (autonomous and preventive maintenance). To validate the model, a pilot project of 5S tools and standardized work was carried out through an internal audit conducted before implementing the tool and after its application, an increase in 5S compliance from 29% to 84% was evidenced. Likewise, the standardized work pilot reduced the cycle time of the raw material classification activity from 708 to 539 seconds thanks to the implementation of a procedures format that standardized the process and eliminated activities with no added value. Regarding TPM, it was validated using Arena software, achieving a 2% improvement in OEE and therefore a 19.4% increase in productivity.
Asymptotic normality of the deconvolution kernel density estimator under the vanishing error variance
Creators: name: Gugushvili, Shota
name: van Es, Bert
Publisher: name: arXiv
Year: 2008
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics
subject: 62G07, 62G20

description: Let $X_1,...,X_n$ be i.i.d. observations, where $X_i=Y_i+σ_n Z_i$ and the $Y$'s and $Z$'s are independent. Assume that the $Y$'s are unobservable and that they have the density $f$ and also that the $Z$'s have a known density $k.$ Furthermore, let $σ_n$ depend on $n$ and let $σ_n\to 0$ as $n\to\infty.$ We consider the deconvolution problem, i.e. the problem of estimation of the density $f$ based on the sample $X_1,...,X_n.$ A popular estimator of $f$ in this setting is the deconvolution kernel density estimator. We derive its asymptotic normality under two different assumptions on the relation between the sequence $σ_n$ and the sequence of bandwidths $h_n.$ We also consider several simulation examples which illustrate different types of asymptotics corresponding to the derived theoretical results and which show that there exist situations where models with $σ_n\to 0$ have to be preferred to the models with fixed $σ.$
description: 22 pages, 8 figures
IMPIEGO DI POMPE COME TURBINE: calcolo fluidodinamico per l'analisi prestazionale e l'inserimento in rete
Creators: name: Fecarotta, Oreste
Publisher: name: Università degli Studi di Napoli Federico II
Year: 2011

description: L’inserimento delle PAT  nelle idrica con il duplice scopo di regolare il livello delle pressione e di riconvertire le dissipazioni funzionali in potenza elettrica può risultare molto vantaggioso, ma la scarsa conoscenza relativa al loro funzionamento in condizioni sia stazionarie che dinamiche ha fatto sorgere la necessità di uno studio più approfondito. Uno studio sulla numerosità della griglia fluidodinamica e sull’influenza dei rasamenti ha permesso di ridurre notevolmente i tempi e le risorse richiesti per  i calcoli CFD, garantendo risultati affidabili in termini di prestazioni idrauliche della PAT in regime stazionario. Lo studio CFD del comportamento della PAT in condizioni transitorie ha mostrato che la risposta dinamica della turbomacchina non è trascurabile. Il nuovo modello proposto, che accoppia lo studio CFD della PAT con le equazioni delle linee caratteristiche,  mostra come, in condizioni di colpo d’ariete, si generino sovrapressioni maggiori rispetto alla modellazione classica quasi steady. Di tali sovrapresssioni si deve necessariamente tener conto in fase di progettazione, onde evitare disservizi e malfunzionamenti della rete idrica. La forte variabilità delle condizioni idrauliche all’interno di una rete idrica esclude la possibilità di poter progettare un impianto di riconversione energetica sulla base di un unico punto di funzionamento. Un semplice schema idraulico permette di inserire la PAT nella rete senza alterarne le condizioni di funzionamento. Inoltre è stato elaborato un criterio di progettazione che permette la scelta ottimale della macchina in assenza di un unico rated point.
Additional file 1 of Identification of TARDBP Gly298Ser as a founder mutation for amyotrophic lateral sclerosis in Southern China
Creators: name: Xu, Fanxi
name: Huang, Sen
name: Li, Xu-Ying
name: Lin, Jianing
name: Feng, Xiuli
name: Xie, Shu
name: Wang, Zhanjun
name: Li, Xian
name: Zhu, Junge
name: Lai, Hong
name: Xu, Yanming
name: Huang, Xusheng
name: Yao, Xiaoli
name: Wang, Chaodong
Publisher: name: figshare
Year: 2022
Subjects: subject: Medicine
subject: Genetics
subject: FOS: Biological sciences
subject: Neuroscience
subject: Virology

description: Additional file 1. Primers designed for amplifying the microsatellites surrounding the TARDBP gene and all the published mutations in the TARDBP gene.
La navigazione fluviale nella fonte letteraria:  note geografiche su due resoconti narrativi di discesa del fiume Po
Creators: name: Papotti, Davide
Publisher: name: Semestrale di studi e ricerche di geografia
Year: 2019

description: The literary source as a repertory of the geography of perception: notes on the contemporary image of the river Po
The article aims at providing an example of how literature can contribute to the investigation of geographical imageries related to waterscapes. As a case study, the article focuses on two recent works by the journalist Beppe Gualazzini (Three men on the river Po, 1985) and the professional fisherman Vitaliano Daolio (The Boat on the River, 2015), both set on the banks of the longest Italian river: the river Po. By offering examples from these texts, the article suggests that literature can be useful in analyzing the perception of the territory, the different gazes on the waterscapes, the sense of direction, the sense of colors, offering thus an insight on the subtle threads of “topophilia”.

La source littéraire comme répertoire de la géographie de la perception: notes sur l’image contemporaine du fleuve Pô
L’article vise à fournir un exemple de comment la littérature peut-elle contribuer à l’investigation d’imageries géographiques liées aux paysages d’eau. A titre d’étude de cas, l’article se concentre sur deux oeuvres récentes par le journaliste Beppe Gualazzini (Trois hommes sur la rivière Pô, 1985) et le pêcheur professionnel Vitaliano Daolio (Le bateau sur la rivière, 2015), tous deux se déroulant sur les rives du plus long fleuve italien: le fleuve Pô. En proposant des exemples de ces textes, l’article suggère que la littérature peut être utile pour analyser la perception du territoire, les différents regards sur les paysages d’eau, le sens de l’orientation, le sens des couleurs, offrant ainsi un aperçu
sur les textures subtiles de l’amour pour les places, de la «topophilie».
description: Semestrale di studi e ricerche di geografia, N. 1 (2019): Scenari Fluviali: rappresentazioni, pratiche e visioni
Improving OEE in a Peruvian SME: A Case Study on the Application of Lean Manufacturing Tools in the Metalworking Sector
Creators: name: Mundaca-Lopez, Carlos
name: Villar-Farfan, Christopher
name: Quiroz-Flores, Juan Carlos
name: García-López, Yvan Jesús
Publisher: name: Hannover : publish-Ing.
Year: 2023
Subjects: subject: Lean Manufacturing
subject: 5S
subject: SLP
subject: TPM
subject: Standardized Work
subject: OEE
subject: Metalworking Sector
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: In Peru, SMEs have been affected by the crisis that caused the COVID 19 pandemic. Likewise, the hard competition with Asian countries like China has been a reason for Peruvian SMEs deciding to work with high-quality products. However, poor machine and maintenance management, high percentage of rework, and excessive downtime are frequent problems faced by SMEs in the metalworking sector. For this reason, the bending area was identified as the most critical. In this study, the case of a Peruvian SME that produces air conditioning products was studied. In this case, the bending area was the most critical. Therefore, the main objective of this study is to prove how the use of lean manufacturing tools can impact the productivity of the bending area, thereby improving indicators such as OEE, cycle time, unnecessary routes, and space reduction.
Stochastic approach of gravitational waves in presence of a decaying cosmological parameter from a 5D vacuum theory of gravity
Creators: name: Martinez, Silvina Paola Gomez
name: da Silva, Lucio Fabio P.
name: Aguilar, Jose Edgar Madriz
name: Bellini, Mauricio
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We develop an stochastic approach to study gravitational waves produced during the inflationary epoch under the presence of a decaying cosmological parameter, on a 5D geometrical background which is Riemann flat. We obtain that the squared tensor metric fluctuations depend strongly on the cosmological parameter $Λ(t)$ and we finally illustrate the formalism with an example of a decaying $Λ(t)$.
description: version to be published in Il Nuovo Cimento B
Developing A Key Performance Indicator System To Integrate Sustainable Corporate Objectives Into Maintenance Using The Analytic Hierarchy Process
Creators: name: Bredebach, Christina
Publisher: name: Hannover : publish-Ing.
Year: 2023
Subjects: subject: Sustainable Maintenance
subject: Sustainability Strategy
subject: Corporate Objectives
subject: Multi Criteria Decision Making
subject: Analytic Hierarchy Process
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: Maintenance in a manufacturing company is a key function for maintaining or restoring the functional condition of the production equipment and machinery and thus for maintaining the overall efficiency of the company. Because of this role, maintenance is often considered "sustainable". As a result of regulatory requirements as well as stakeholder demands, companies are under pressure to specify their sustainability strategies. However, due to a lack of knowledge about the sustainability potential of this function, the identification of clear objectives for sustainable maintenance is often neglected. Therefore, this paper presents a performance indicator system. 133 performance indicators in the three dimensions of sustainability (economic, environmental and social) were identified in a systematic literature review. In a qualitative content analysis and inductive categorisation, these were then assigned to 20 different categories. The hierarchical arrangement as well as the derivation of sustainable maintenance objectives from the corporate strategy enables companies to rank the performance indicators with the help of AHP (Analytic Hierarchy Process), a tool of MCDM (Multi Criteria Decision Making). This leads to a system of performance indicators based on a company's sustainability strategy, which strengthens the focus on sustainability in maintenance functions.
Deep water renewal in the Strait of Georgia
Creators: name: Doherty, Louis Ford
Publisher: name: University of British Columbia
Year: 2010

description: The seasonal and interannual variation of the water properties and deep water renewal in the Strait of Georgia are examined. Temperature, salinity and dissolved oxygen data acquired over an intensively sampled one year period are presented to show the timing of renewal periods and the variation in properties across the Strait and with depth. The northward propagation of the renewal signal and of its variation across the Strait of Georgia are discussed. A volumetric analysis provides temperature and salinity averages of the Strait of Georgia waters and of renewal water during several stages of each renewal period. Estimates of the renewal volume are calculated using a heat and salt budget method. Data collected in the central part of the Strait over several decades are presented to show the interannual variation in water properties. Correlation coefficients relating the wintertime air temperatures to the deep water properties some time later in the Strait are given.
Multifractal spectrum of phase space related to generalized thermostatistics
Creators: name: Olemskoi, A. I.
name: Kharchenko, V. O.
name: Borisyuk, V. N.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: We consider a self-similar phase space with specific fractal dimension $d$ being distributed with spectrum function $f(d)$. Related thermostatistics is shown to be governed by the Tsallis formalism of the non-extensive statistics, where the non-additivity parameter is equal to ${\barτ}(q)\equiv 1/τ(q)>1$, and the multifractal function $τ(q)= qd_q-f(d_q)$ is the specific heat determined with multifractal parameter $q\in [1,\infty)$. In this way, the equipartition law is shown to take place. Optimization of the multifractal spectrum function $f(d)$ derives the relation between the statistical weight and the system complexity. It is shown the statistical weight exponent $τ(q)$ can be modeled by hyperbolic tangent deformed in accordance with both Tsallis and Kaniadakis exponentials to describe arbitrary multifractal phase space explicitly. The spectrum function $f(d)$ is proved to increase monotonically from minimum value $f=-1$ at $d=0$ to maximum one $f=1$ at $d=1$. At the same time, the number of monofractals increases with growth of the phase space volume at small dimensions $d$ and falls down in the limit $d\to 1$.
description: 16 pages, 7 figures
Concept of a Data-Driven Business Model for Circular Production Equipment
Creators: name: Riesener, Michael
name: Kuhn, Maximilian
name: Blondrath, Aileen
name: Tariq, Balaj
name: Schuh, Günther
Publisher: name: Hannover : publish-Ing.
Year: 2023
Subjects: subject: Business model innovation
subject: Digital platform ecosystem
subject: Automotive production
subject: Production equipment
subject: Circular economy
subject: Pay per use
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: New legislation and the social movement around circular economy issues are currently forcing manufacturing companies to reassess the sustainability of their production and value chain. The circular economy is becoming an important economic concept, challenging manufacturing companies to develop approaches for realising resource-efficient production and usage of products. One potential area for sustainable production lies in the production equipment used for example in automotive production, such as robots, grippers and fixtures. However, new business models are needed to realise sustainable and recyclable production equipment, as existing ones do not take this into account. This paper presents an approach that deals with business model innovation and a digital platform ecosystem for circular production equipment. First, established business models are analysed for their transferability to automotive production. In particular, the use of subscriptions for production equipment is focused on and evaluated. The assessment is based on interviews with experts from equipment manufacturers and is quantified by them. The result is a presentation of the potential of the developed business model and a corresponding "as-a-service" concept for implementation using a digital platform.
Magnetic Component of Quark-Gluon Plasma
Creators: name: Liao, Jinfeng
name: Shuryak, Edward
Publisher: name: arXiv
Year: 2008
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We describe recent developments of the "magnetic scenario" of sQGP. We show that at $T=(0.8-1.3)T_c$ there is a dense plasma of monopoles, capable of supporting metastable flux tubes. Their existence allows to quantitatively explained the non-trivial $T$-dependence of the static $\bar Q Q$ potential energy calculated on the lattice. By molecular dynamics simulation we derived transport properties (shear viscosity and diffusion constant) and showed that the best liquid is given by most symmetric plasma, with 50%-50% of electric and magnetic charges. The results are close to those of the ``perfect liquid'' observed at RHIC.
description: Contribution to the 20th International Conference on Nucleus Nucleus Collisions (Quark Matter 2008)
Head-On collisions of different initial data
Creators: name: Sperhake, Ulrich
name: Bruegmann, Bernd
name: Gonzalez, Jose
name: Hannam, Mark
name: Husa, Sascha
Publisher: name: arXiv
Year: 2007
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: We discuss possible origins for discrepancies observed in the radiated energies in head-on collisions of non-spinning binaries starting from Brill-Lindquist and superposed Kerr-Schild data. For this purpose, we discuss the impact of different choices of gauge parameters and a small initial boost of the black holes.
description: Proceedings of the Eleventh Marcel Grossmann Meeting; 3 pages (limit)
Page Curve from Defect Extremal Surface and Island in Higher Dimensions
Creators: name: Chu, Jinwei
name: Deng, Feiyu
name: Zhou, Yang
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Defect extremal surface is defined by minimizing the Ryu-Takayanagi surface corrected by the defect theory, which is useful when the RT surface crosses or terminates on the defect. Based on the decomposition procedure of a AdS bulk with a defect brane, proposed in arXiv:2012.07612, we derive Page curve in a time dependent set up of AdS$_3$/BCFT$_2$, and find that the result from island formula agrees with defect extremal surface formula precisely. We then extend the study to higher dimensions and find that the entropy computed from bulk defect extremal surface is generally less than that from island formula in boundary low energy effective theory, which implies that the UV completion of island formula gives a smaller entropy in higher dimensions.
description: 45 pages, 18 figures
Gravitational Lorentz Violation and Superluminality via AdS/CFT Duality
Creators: name: Sundrum, Raman
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: A weak quantum mechanical coupling is constructed permitting superluminal communication within a preferred region of a gravitating AdS_5 spacetime. This is achieved by adding a spatially non-local perturbation of a special kind to the Hamiltonian of a four-dimensional conformal field theory with a weakly-coupled AdS dual, such as maximally supersymmetric Yang-Mills theory. In particular, two issues are given careful treatment: (1) the UV-completeness of our deformed CFT, guaranteeing the existence of a ``deformed string theory'' AdS dual, and (2) the demonstration that superluminal effects can take place in AdS, both on its boundary as well as in the bulk. Exotic Lorentz-violating properties such as these may have implications for tests of General Relativity, addressing the cosmological constant problem, or probing "behind'' horizons. Our construction may give insight into the interpretation of wormhole solutions in Euclidean AdS gravity.
description: 23 pages LaTex. Typo in Eq. (37) corrected. References added
The environment of QSO triplets at 1 $\lesssim$ z $\lesssim$ 1.5
Creators: name: Vicentin, Marcelo C.
name: Araya-Araya, Pablo
name: Sodré, Laerte
name: Overzier, Roderik
name: Carrasco, Eleazar R.
name: Cuevas, Hector
Publisher: name: arXiv
Year: 2021
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: We present an analysis of the environment of six QSO triplets at 1 $\lesssim$ z $\lesssim$ 1.5 by analyzing multiband (r,i,z, or g,r,i) images obtained with Megacam at the CFHT telescope, aiming to investigate whether they are associated or not with galaxy protoclusters. This was done by using photometric redshifts trained using the high accuracy photometric redshifts of the COSMOS2015 catalogue. To improve the quality of our photometric redshift estimation, we included in our analysis near-infrared photometry (3.6 and 4.5 $μm$) from the unWISE survey available for our fields and the COSMOS survey. This approach allowed us to obtain good photometric redshifts with dispersion, as measured with the robust Sigma NMAD statistics of $\sim$ 0.04 for our six fields. Our analysis setup was reproduced on lightcones constructed from the Millennium Simulation data and the latest version of the L-GALAXIES semi-analytic model to verify the protocluster detectability in such conditions. The density field in a redshift slab containing each triplet was then analyzed with a Gaussian kernel density estimator. We did not find any significant evidence of the triplets inhabiting dense structures, such as a massive galaxy cluster or protocluster.
description: MNRAS accepted paper (https://doi.org/10.1093/mnras/stab520), 20 pages, 16 Figures
Genetic optimization of quantum annealing
Creators: name: Hegde, Pratibha Raghupati
name: Passarelli, Gianluca
name: Scocco, Annarita
name: Lucignano, Procolo
Publisher: name: arXiv
Year: 2021
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The study of optimal control of quantum annealing by modulating the pace of evolution and by introducing a counterdiabatic potential has gained significant attention in recent times. In this work, we present a numerical approach based on genetic algorithms to improve the performance of quantum annealing, which evades the Landau-Zener transitions to navigate to the ground state of the final Hamiltonian with high probability. We optimize the annealing schedules starting from polynomial ansatz by treating their coefficients as chromosomes of the genetic algorithm. We also explore shortcuts to adiabaticity by computing a practically feasible $k$-local optimal driving operator, showing that even for $k=1$ we achieve substantial improvement of the fidelity over the standard annealing solution. With these genetically optimized annealing schedules and/or optimal driving operators, we are able to perform quantum annealing in relatively short time-scales and with larger fidelity compared to traditional approaches.
description: 13 pages, 11 figures
Outburst Morphology in the Soft X-ray Transient Aquila X-1
Creators: name: Maitra, Dipankar
name: Bailyn, Charles D.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present optical and near-IR (OIR) observations of the major outbursts of the neutron star soft X-ray transient binary system Aquila X-1, from summer 1998 -- fall 2007. The major outbursts of the source over the observed timespan seem to exhibit two main types of light curve morphologies, (a) the classical Fast-Rise and Exponential-Decay (FRED) type outburst seen in many soft X-ray transients and (b) the Low-Intensity State (LIS) where the optical-to-soft-X-ray flux ratio is much higher than that seen during a FRED. Thus there is no single correlation between the optical (R-band) and soft X-ray (1.5-12 keV, as seen by the ASM onboard RXTE) fluxes even within the hard state for Aquila X-1, suggesting that LISs and FREDs have fundamentally different accretion flow properties. Time evolution of the OIR fluxes during the major LIS and FRED outbursts is compatible with thermal heating of the irradiated outer accretion disk. No signature of X-ray spectral state changes or any compact jet are seen in the OIR, showing that the OIR color-magnitude diagram (CMD) can be used as a diagnostic tool to separate thermal and non-thermal radiation from X-ray binaries where orbital and physical parameters of the system are reasonably well known. We suggest that the LIS may be caused by truncation of the inner disk in a relatively high mass accretion state, possibly due to matter being diverted into a weak outflow.
description: Accepted for publication in ApJ. Uses aastex. 27 pages and 10 figures
Physical Properties of Weak MgII Absorbers at z~2
Creators: name: Lynch, Ryan S.
name: Charlton, Jane C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of photoionization modeling of nine weak MgII (W_r<0.3 Ang) quasar absorption line systems with redshifts 1.4
description: ApJ accepted; 37 pages, 17 figures
A lower bound on web services composition
Creators: name: Muscholl, Anca
name: Walukiewicz, Igor
Publisher: name: arXiv
Year: 2008
Subjects: subject: Logic in Computer Science (cs.LO)
subject: FOS: Computer and information sciences
subject: F.1.2; F.3.1

description: A web service is modeled here as a finite state machine. A composition problem for web services is to decide if a given web service can be constructed from a given set of web services; where the construction is understood as a simulation of the specification by a fully asynchronous product of the given services. We show an EXPTIME-lower bound for this problem, thus matching the known upper bound. Our result also applies to richer models of web services, such as the Roman model.
Application Of The Dynamic Tolerancing Approach To The Assembly Of Fuel Cell Stacks
Creators: name: Aichele, Andreas
name: Mannuß, Oliver
name: Sauer, Alexander
Publisher: name: Hannover : publish-Ing.
Year: 2023
Subjects: subject: manufacturing technology
subject: assembly process
subject: cost reduction
subject: manufacturing tolerances
subject: stack assembly
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau

description: The proton exchange membrane fuel cell (PEM-FC) makes it possible to provide electrical energy for a wide range of applications without polluting emissions as a by-product. However, various challenges need to be overcome before widespread use of this technology is possible. In addition to optimizing its performance and lifetime, a key challenge is to reduce production costs. Production processes significantly affect these three objectives. Tighter manufacturing tolerances on the main components, membrane exchange assembly and bipolar plate, for example, can improve the functions above. However, manufacturing to tighter tolerances usually leads to higher production costs. To resolve the contradiction between 'tight tolerances' and 'low costs', the principle of dynamic tolerancing was developed. So far, this principle has only been implemented for a shaft-hub connection. The approach presented here applies the principle to the assembly process of a stack for a PEM-FC and shows how the channel offset within a stack can be reduced without increasing the requirements for individual part tolerances.