cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
A computational periporomechanics model for localized failure in unsaturated porous media
Creators: name: Menon, Shashank
name: Song, Xiaoyu
Publisher: name: arXiv
Year: 2020
Subjects: subject: Numerical Analysis (math.NA)
subject: Geophysics (physics.geo-ph)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We implement a computational periporomechanics model for simulating localized failure in unsaturated porous media. The coupled periporomechanics model is based on the peridynamic state concept and the effective force state concept. The coupled governing equations are integral-differential equations without assuming the continuity of solid displacement and fluid pressures. The fluid flow and effective force states are determined by nonlocal fluid pressure and deformation gradients through the recently formulated multiphase constitutive correspondence principle. The coupled peri-poromechanics is implemented numerically for high-performance computing by an implicit multiphase meshfree method utilizing the message passing interface. The numerical implementation is validated by simulating classical poromechanics problems and comparing the numerical results with analytical solutions and experimental data. Numerical examples are presented to demonstrate the robustness of the fully coupled peri-poromechanics in modeling localized failures in unsaturated porous media.
Oxygen activity change in soda-lime-silica glass melts with or without refining agent
Creators: name: Yamashita, Masaru
name: Yamanaka, Hiroshi
Publisher: name: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft
Year: 1997
Subjects: subject: 660

description: The effect of refining agents in soda-lime-silica melts was examined by measuring the oxygen activity wi th the method of electromotive force. When the melt contained antimony, the activity changed with temperature and the Variation in activity increased as the antimony content increased. When the oxygen content in the atmosphere changed, the oxygen activity in the melt changed gradually by diffusion. The Variation in oxygen activity with atmosphere decreased with increasing antimony content and almost disappeared when the Sb₂O₃ content was 1 mol%. In the case of sulfate addition, the activity value became unstable when the temperature was raised, which might be caused by bubble formation accompanied by the decomposition of sulfate.
Physical constants and the Gurzadyan-Xue formula for the dark energy
Creators: name: Vereshchagin, G. V.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: Classical Physics (physics.class-ph)
subject: FOS: Physical sciences

description: We consider cosmological implications of the formula for the dark energy density derived by Gurzadyan and Xue which predicts a value fitting the observational one. Cosmological models with varying by time physical constants, namely, speed of light and gravitational constant and/or their combinations, are considered. In one of the models, for example, vacuum energy density induces effective negative curvature, while another one has an unusual asymptotic. This analysis also explicitely rises the issue of the meaning and content of physical units and constants in cosmological context.
description: version corrected to match the one to appear in Modern Physics Letters A
Studying the $\bar{D}_1K$ molecule in the Bethe-Salpeter equation approach
Creators: name: Qi, Jing-Juan
name: Wang, Zhen-Yang
name: Zhang, Zhu-Feng
name: Guo, Xin-Heng
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We interpret the $X_1(2900)$ as an $S$-wave $\bar{D}_1K$ molecular state in the Bethe-Salpeter equation approach with the ladder and instantaneous approximations for the kernel. By solving the Bethe-Salpeter equation numerically with the kernel containing one-particle-exchange diagrams and introducing three different form factors (monopole, dipole, and exponential form factors) in the verties, we find the bound state exists. We also study the decay width of the decay $X_1(2900)$ to $D^-K^+$.
description: 13 pages, 4 figures. arXiv admin note: text overlap with arXiv:2004.14085, arXiv:1906.09002
Adecuaciones jurídicas e institucionales para la implementación de un modelo presupuestal inteligente basado en instrumentos de la cuarta revolución industrial (4RI)
Creators: name: Calpa Gómez, Marisella
Publisher: name: Universidad Externado de Colombia
Year: 2024
Subjects: subject: Economía - Aspectos jurídicos
subject: Derecho administrativo - Colombia
subject: Gastos públicos - Legislación
subject: Presupuesto General de la Nación
subject: Sistema General de Regalías
subject: Cuarta Revolución Industrial
subject: Big Data
subject: Machine Learning

description: El esquema clásico de la administración pública con la llegada de la Cuarta Revolución Industrial 4RI, se encuentra bajo retos nunca antes imaginados, pues estamos en un escenario donde la decisión gubernamental hace frente a realidades complejas que se ejecutan en tiempo real, bajo modelos que no se corresponden con las herramientas de apoyo con que cuentan los tomadores de decisiones, no siendo la excepción el proceso de asignación y gestión de la inversión pública. Bajo el modelo de teórico de la Nueva Economía Institucional (North C., 2003), el presente trabajo hace un análisis crítico de las reglas formales que rigen el proceso de gestión y asignación de inversión pública en Colombia, y a partir de análisis de casos, se propone un modelo experimental que hace uso de herramientas inteligentes a través del cual se podrían implementar soluciones que den lugar a la superación de brechas previamente identificadas y que impiden la eficiente gestión de la inversión pública del presupuesto público en el país.
Analysis of Increasing Efficiency of Gas Turbines by Using Absorption Refrigerator (AR)
Creators: name: Dyussembekova, Nassipkul
name: Kibarin, Andrey
name: Umyshev, Dias
name: Minazhova, Saulesh
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2019
Subjects: subject: Ambient Air Temperature
subject: Gas Turbine
subject: DDC::500 Naturwissenschaften und Mathematik

description: The paper presents an analysis of the gas turbine power plant’s (GTPP) operation. It is shown that in summer the efficiency of GTPP is significantly reduced due to the high air temperature on the inlet of the compressor. In the summer, the efficiency and, accordingly, the production of electric energy is reduced due to high temperatures of the ambient air. This article presents an analysis of the possibility of increasing the efficiency of the gas turbine engine. The analysis shows that the use of absorption refrigerator (AR) in hot periods of the year, in which the outside air temperature exceeds 20 degrees is the optimal solution. The analysis showed that the use of AR allows to increase efficiency and specific heat consumption by 3 %, capacity by 14 % (5,5 % annually) MW and reduce fuel consumption by 2,5-3 %. The experience of modernization of gas turbine unit (GTU) is available, for the installation of AR it will be required about 2500 million tenge (6000 US dollars). Taking into account the economic effect of 740 million tenge, a simple payback period for the introduction of air cooling systems at GTPP will be about 4 years.
Vitrification of waste materials
Creators: name: Krauß, Manfred
Publisher: name: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft
Year: 1997
Subjects: subject: 660

description: The vitrification by mehing processes is the only technical process for safe immobilization and destruction of environmentally dangerous components in waste materials. Toxic filter dusts, which are produced in incineration plants, serve as an example of such wastes. The principal problems of all vitrification methods developed are the wide composition Variation of the input materials, t h e risk of new filter dust formation by necessary flue gas cleaning plants, especially of sulphur Compounds, the lack of knowledge of the melting behaviour, and achieving chemical long-term stabihty of the resulting waste glasses. Melting experiments with model Systems show that the typical composition ränge of incineration filter dust allows synthesis of resulting glasses without addition of other materials. With a carbon content of more than 5 wt% the glasses are black. The formation of galt and the loss of sulphur by evaporation in the glasses decrease with increasing contents of carbon and the number of metals which support the formation of metal sulphide groups in the glass. The legal limits of the long-term leaching stability are observed for copper and zinc. By the results of the research project it has become possible t o produce waste glasses which can be processed to new glass products.
Regulation of protein kinases during postnatal development of rat heart
Creators: name: Kim, Sung Ouk
Publisher: name: University of British Columbia
Year: 2009

description: The loss of ability to proliferate, the shift in the energy dependency from carbohydrate to fatty acids and the reduction in capability to resist ischemia are some of the key phenomena observed during postnatal development of the heart. These distinct phenotypic changes can be attributed to the regulation of intracellular signal transduction proteins. To investigate how these protein kinases are expressed during postnatal development, 44 different protein kinases were studied by Western blotting analysis. Among them protein kinases, implicated in cell proliferation and cell cycle including protein kinase C, cyclin-dependent protein kinases and mitogenic MAP kinases, declined during the postnatal development. The specific activities of Erkl and Erk2 declined with age, which was concurrent to the decrease of CDK1 activity. The protein kinases involved in stress-responses such as Mlk3, Mekkl, Sekl, Mkk3 and Mapkapk2, increased in expression during postnatal development. The proto-oncogene-encoded kinases Mos and Tpl2 were up-regulated. The expression of the insulin-activated kinases (PI3K, PKB, S6K and CK2) was downregulated by 40-60% with age. The activities of PKB, S6K and CK2 were also decreased with age. Tissue distribution studies of adult rats revealed that most of the protein kinases that were up-regulated during heart development tended to be preferentially expressed in the heart, whereas the down-regulated protein kinases were generally expressed in the heart at relatively lower amounts than in most other tissues. To investigate the signalling pathways of these kinases, isolated cardiomyocytes or isolated whole hearts were treated with various agonists. These results indicate that Erkl can be regulated via PKC but not by cAPK nor cGPK, whereas Mapkapk2 can be controlled by cGPK but not by the other two kinases. Erkl and Erk2 were also activated by endothelin-1 and adenosine in isolated cardiomyocytes. Insulin led to activation of PKB, S6K and CK2, whereas Erk1 and Erk2 were not stimulated. To investigate novel protein kinases which undergo developmental changes, the extracts of rat heart ventricles were incubated in the presence of [y-³²P]ATP and then the phosphoproteins were resolved by using SDS-PAGE. This assay revealed at least 8 phosphoproteins that underwent change during development. Among them, a 40-kDa phosphoprotein appeared to be an autophosphorylating protein-histidine kinase, which may represent the first of its kind detected in a mammalian system.
Development of a soluble high-temperature insulation fibre
Creators: name: Alexander, Iain C.
name: Jubb, Gary A.
Publisher: name: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft
Year: 1997
Subjects: subject: 660

description: The three variables, dose, dimensions and durability, have been shown from many studies to be the factors that combine to give the potendal for a fibre to cause respiratory diseases. Considering durability, a fibre that could show increased dissoludon, possibly accompanied by chemical change, in physiological Solutions would be expected to show a reduced persistence in the lungs and have a lower potential for producing respiratory diseases. The development of such a fibre, Superwool X607, and the understanding that has been acquired in terms of solubility rate and other fibre properties is presented in this paper. The importance of in-vitro solubility rate studies to screen potendally useful fibre compositions, combined with an understanding of how these composidons can be selected using free energy of hydradon or non-bridging oxygen theories, is discussed in terms of developing new less "in-vivo" durable fibres.
Simulating galactic outflows with kinetic supernova feedback
Creators: name: Vecchia, Claudio Dalla
name: Schaye, Joop
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Feedback from star formation is thought to play a key role in the formation and evolution of galaxies, but its implementation in cosmological simulations is currently hampered by a lack of numerical resolution. We present and test a sub-grid recipe to model feedback from massive stars in cosmological smoothed particle hydrodynamics simulations. The energy is distributed in kinetic form among the gas particles surrounding recently formed stars. The impact of the feedback is studied using a suite of high-resolution simulations of isolated disc galaxies embedded in dark halos with total mass 10^{10} and 10^{12} Msol/h. We focus in particular on the effect of pressure forces on wind particles within the disc, which we turn off temporarily in some of our runs to mimic a recipe that has been widely used in the literature. We find that this popular recipe gives dramatically different results because (ram) pressure forces on expanding superbubbles determine both the structure of the disc and the development of large-scale outflows. Pressure forces exerted by expanding superbubbles puff up the disc, giving the dwarf galaxy an irregular morphology and creating a galactic fountain in the massive galaxy. Hydrodynamic drag within the disc results in a strong increase of the effective mass loading of the wind for the dwarf galaxy, but quenches much of the outflow in the case of the high-mass galaxy.
description: 15 pages, 11 figures, accepted for publication in MNRAS. Added 4 new figures and made minor textual changes. Simulation videos available at http://www.strw.leidenuniv.nl/DS08/
Mutations in the SARS-CoV-2 spike protein modulate the virus affinity to the human ACE2 receptor, an in silico analysis
Creators: name: Ortega, Joseph Thomas
name: Pujol, Flor Helene
name: Jastrzebska, Beata
name: Rangel, Hector R.
Publisher: name: IfADo - Leibniz Research Centre for Working Environment and Human Factors, Dortmund
Year: 2021
Subjects: B.1.1.7
COVID-19
SARS-CoV-2
spike
variants

description: The increasing number of SARS-CoV-2 variants associated with highly transmissible phenotypes is a health-public concern in the current pandemic scenario. Herein, we developed a comprehensive in silico analysis of the changes occurring upon mutations in the viral spike. We focused on mutants located in the receptor-binding domain of the viral spike protein and analyzed whether these mutants modulate the interaction with the human host receptor angiotensin-converting enzyme II (ACE2). Thirty-two highly prevalent mutants were retrieved from the GISAID database, and their structural models were built using the SWISS-Model server. The stabilization effect for each mutation was assessed by the DUET and DeepDGG software. By applying molecular docking using both Z-Dock and Haddock software we found that multiple mutations, including A475V, V455E, V445L, and V445I, resulted in the higher binding free energy as compared to the wild type (WT) spike protein, thus had a destabilizing effect on the binding to ACE2. On the other hand, several mutants, including the most prevalent N501Y and B.1.1.7 variants, as well as the K444R, L455F, Q493R, and Y505W variants exhibited lower binding free energy as compared to the WT spike. These mutants showed an increased number of electrostatic interactions with ACE2 than the WT spike protein, and they changed the interaction pattern of the neighboring residues. Together, the results presented in this study contribute to a better understanding of the changes in the interaction between SARS-CoV-2 and the human host ACE2 receptor associated with point mutations in the viral spike protein.
description: EXCLI Journal; 20:Doc585; ISSN 1611-2156
Crystal structure on rigged configurations
Creators: name: Schilling, Anne
Publisher: name: arXiv
Year: 2005
Subjects: subject: Quantum Algebra (math.QA)
subject: Combinatorics (math.CO)
subject: FOS: Mathematics
subject: 17B37; 81R50; 82B23; 05A19

description: Rigged configurations are combinatorial objects originating from the Bethe Ansatz, that label highest weight crystal elements. In this paper a new unrestricted set of rigged configurations is introduced for types ADE by constructing a crystal structure on the set of rigged configurations. In type A an explicit characterization of unrestricted rigged configurations is provided which leads to a new fermionic formula for unrestricted Kostka polynomials or q-supernomial coefficients. The affine crystal structure for type A is obtained as well.
description: 20 pages, 1 figure, axodraw and youngtab style file necessary
Physical modelling of flow behavior in a stirred glass system
Creators: name: Spremulli, Paul F.
Publisher: name: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft
Year: 1997
Subjects: subject: 660

description: As stirring efficiency made the use of isothermal models plausible, dimensional analysis was used to extend model laws to include stirrers, gobbing cams and to indicate the conditions required to get data representative of actual or proposed units. Based on fullsize modelling, the production department installed stirred glass set-ups and made excellent products. Correlation between modelling and production was excellent and included mechanical variables and temperatures. Furthermore, a new delivery system, including a new gobbing cam designed for a very fluid photosensitive glass, was based on modelling and behaved exactly as predicted. Upsets in the stirred glass, delivery Systems resulted in slow cyclic weight variations of about 1 %. As the weights of the items being made were specified to within ±1.0%, it was clear that control had to be improved. The weight changes were not caused by compositional changes in the glass but to some Instrumentation problems and to some unique, unknown problem(s) associated with stirring. Thus, a better understanding of how temperature and the stirrers controlled flow was needed. Assuming that flow is inversely proportional to viscosity showed that the change in weight should be about 0.9%/°C. This number is about 1 0% too low compared with the empirical value of 1 %/°C quoted by Operators. Next data from a full-size, stirred model were summarized in an equation which relates flow to the viscosity of the fluid and to the rotational speed and vertical position of the stirrer. Partial differentiations and evaluations of this equation at a nominal operating condition showed that the weight should first, vary by 1.02%o/°C, second, decrease by 0.90% per rpm increase and third, increase by 0.80% when the stirrer was raised (0.006") or 1 % when it was at the 5/8" position.
Eficacia de la intervención del Estado colombiano en el sector TIC : estudio de caso sobre las subastas de espectro 2019 y 2023
Creators: name: Luque Marquez, Ruben Crisanto De
Publisher: name: Universidad Externado de Colombia
Year: 2024
Subjects: subject: Regulación del comercio - Aspectos jurídicos
subject: Telecomunicaciones - Legislación
subject: Sentencias - Estudios de caso
subject: Espectro radioeléctrico
subject: Proceso de selección objetiva
subject: Gestión de espectro
subject: Conectividad

description: El espectro radioeléctrico, es definido un recurso escaso, dicho componente de escasez justifica la intervención del Estado en lo que atañe a su gestión, administración, asignación y control, que para la presente investigación se centra en la asignación de espectro mediante procesos de selección objetiva, como lo son las subastas. Estas subastas han demostrado ser, teniendo como muestra sólo dos de ellos (años 2019 y 2023), un mecanismo eficiente de explotación de un recurso escaso, generando bienestar a los usuarios de los servicios de telefonía e Internet móvil al lograrse una mayor cobertura y un mejoramiento de las condiciones de calidad en la prestación del servicio.
description: The radio spectrum is defined as a scarce resource. This scarcity component justifies the intervention of the State in terms of its management, administration, assignment and control, which for this research focuses on the assignment of spectrum through objective selection processes, like the auctions. These auctions have proven to be, taking as a sample only two of them (years 2019 and 2023), an efficient mechanism for exploiting a scarce resource, generating well-being for users of mobile telephone and Internet services by achieving greater coverage and a improvement of quality conditions in the provision of the service.
Temperature dependence of the redox State of iron and sulfur in amber glass melts
Creators: name: Müller-Simon, Hayo
Publisher: name: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft
Year: 1997
Subjects: subject: 660

description: In industrially melted amber glass the logarithm [Fe²⁺]/[Fe³⁺] shows no linear dependence on the logarithm of oxygen partial pressure. This nonlinearity is due to the interaction between iron and sulfur which can be described by means of a simple oxygen balance model. The change of chemically dissolved oxygen as a function of the oxygen partial pressure depends on the redox State and has a minimum at intermediate oxygen partial pressures. In this region small variations of the reducing additions in the batch cause large variations of the oxygen partial pressure.
Writing off, Restructuring or Refinancing the Debt? The IMF’s role in the Greek Debt Crisis
Creators: name: Manasse, Paolo
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2015
Subjects: SECS-P/01 Economia politica

description: This paper looks at the recent debt crisis in Greece and argues that the crisis exemplifies a sequence of
systematic mistakes made by International Financial Institutions, mistakes whose consequences had been clearly anticipated at the time of the first bail-out and could have been avoided. I will argue that the “original sin” of international creditors has been that of refinancing, rather than partially writing off, the debt. This mistake has led to excessively restrictive policies, and has ultimately to interventions of bail-out/in much larger than those which would have solved the problem at the outset, causing unnecessary pain to the economy and damaging both creditors’ and debtors’ interests.
Konventionell beheizte Glasschmelzöfen für die Hohl- und Flachglasherstellung im deutschsprachigen Raum - Ergebnisse einer HVG-Umfrage - Teil 1. Beheizung, bauliche Merkmale, Schmelzleistung
Creators: name: Fleischmann, Bernhard
Publisher: name: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft
Year: 1997
Subjects: subject: 660

description: [no abstract available]
Fast simulation of avalanche and streamer in GEM detector using hydrodynamic approach
Creators: name: Rout, Prasant Kumar
name: Datta, Jaydeep
name: Roy, Promita
name: Bhattacharya, Purba
name: Mukhopadhyay, Supratik
name: Majumdar, Nayana
name: Sarkar, Sandip
Publisher: name: arXiv
Year: 2020
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: A fast, hydrodynamic numerical model has been developed on the COMSOL Multi-physics platform to simulate the evolution and dynamics of charged particles in gaseous ionization detectors based on the Gaseous Electron Multipliers (GEM). Effects of using two-dimensional (2D), 2D axisymmetric and three-dimensional(3D) models of the detectors have been analyzed to choose the optimum configuration. The chosen model has been used to follow the entire operating regime of single, double and triple GEM detectors, including avalanche and streamer mode operations. The accumulation of space charge, its contribution towards the distortion of the applied electric field and production of streamers have been investigated in fair detail using the optimized model.
description: V2: figure - 1 modified, few modifications in texts and references
Konventionell beheizte Glasschmelzöfen für die Hohl- und Flachglasherstellung im deutschsprachigen Raum - Ergebnisse einer HVG-Umfrage - Teil 2. Glasqualität und Energieverbrauch
Creators: name: Fleischmann, Bernhard
Publisher: name: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft
Year: 1997
Subjects: subject: 660

description: [no abstract available]
Energy transport along FPU-beta chains containing binary isotopic disorder: Zero temperature systems
Creators: name: Snyder, K. A.
name: Kirkpatrick, T. R.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: FOS: Physical sciences

description: Dissipation from harmonic energy eigenstates is used to characterize energy transport in binary isotopically disordered (BID) Fermi-Pasta-Ulam (FPU-beta) chains. Using a continuum analog for the corresponding harmonic portion of the Hamiltonian, the time-independent wave amplitude is calculated for a plane wave having wavelength λthat is incident upon the disordered section, and the solution is mapped onto the discrete chain. Due to Anderson localization, energy is initially localized near the incident end of the chain, and in the absence of anharmonicity the wave amplitude is stationary in time. For sufficient anharmonicity, however, mode transitions lead to dissipation. Energy transport along the chain is quantified using both the second moment M of the site energy, and the number of masses contributing to transport, which was estimated from the localization parameter. Over the time scales studied, M increased linearly in time, yielding an effective transport coefficient G. At low and intermediate impurity concentration, G(c) can be characterized by a competition between the rate of mode transitions and the time for energy to propagate a distance equal to the localization length ξ. At the highest concentrations (1.6 \le cλ\le 16.0), there is significant mode transition suppression in BID systems, and the transport coefficient G(c) becomes proportional to ξ(c).
description: 16 pages, 21 figures
Elektrisch beheizte Glasschmelzöfen - Heutiger Stand vor dem Hintergrund Energie, Umwelt, Flexibilität und Betriebssicherheit
Creators: name: Voss, Hans-Jörg
Publisher: name: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft
Year: 1997
Subjects: subject: 660

description: Vor dem Hintergrund der globalen Energiesituadon und daraus abgeleiteter Umweltgesichtspunkte wird die Schmelze von Glas in vollelektrischen Schmelzöfen mit der in fossil befeuerten Öfen verglichen. Elektrozusatzbeheizung sowie vollelektrische Beheizung in der Schmelzwanne bis zum Speiserkopf werden geschildert und insbesondere Vor- und Nachteile sowie Besonderheiten der Coldtop-Schmelze erläutert. Ein Abschnitt über die Modelltechnik bei vollelektrischen Glasschmelzwannen beschließt Teil 1 der Arbeit.
Una revisión de las asimetrías de información en el comercio electrónico
Creators: name: Barraza Rivas, Mariangel
Publisher: name: Universidad Externado de Colombia
Year: 2024
Subjects: subject: Consumidores - Estudios de caso
subject: Regulaciones al comercio - Legislación
subject: Comercio electrónico - Aspectos jurídicos
subject: Protección al consumidor
subject: Comercio electrónico
subject: Plataformas digitales
subject: Globalización

description: El presente documento busca demostrar q4e la calificación que los consumidores colocan en las plataformas de comercio electrónico es un medio de información que brinda confianza a los consumidores para concretar sus compras. La calificación, en esta investigación, se considera como un medio de información que surge de la autorregulación y que permite generar confianza en los futuros consumidores. En las relaciones de consumo, se argumenta que el consumidor es un agente de la cadena de valor que carece de medios para informarse sobre los productos a consumir. No obstante, se ha evidenciado que a través de ·mecanismos de autorregulación impulsados por la creación de las plataformas de comercio electrónico, se provee información relevante mediante las calificaciones de otros consumidores que comparten su experiencia de consumo. Esta información proporcionada es uno de los factores determinantes en la decisión de compra de los consumidores, como se demuestra con datos empíricos recopilados a través de la literatura.
description: The present ivestigation seeks to demonstrate that the ratings consumers place on e-commerce platforms are information that provides confidence to others consumers whrn they make their own purchases. The rating, in this research, is considered as information that arises from selfregul ation and allows to build trust between consumers. In consumer relationships, it is argued that the consumer is a value chain agent who lacks means to inform themselves about the products to be consumed. However, it has been evidenced that through self-regulation mechanisms driven by the creation of e-commerce platforms, relevant information is provided through ratings from other consumers who share their experience. This information is ene· of the determining factors in consumers ' decisions, as demonstrated by empirical data collected through literature.
Parabolic Cylinders and Folk Theorems
Creators: name: Delbono, Flavio
name: Lambertini, Luca
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2015
Subjects: SECS-P/01 Economia politica

description: We study a class of games featuring payoff functions being parabolic cylinders where best reply functions are orthogonal and therefore the pure-strategy non-cooperative solution is attained as a Nash equilibrium in dominant strategies. We prove that the resulting threshold of the discount factor above which implicit collusion on the Pareto frontier is stable in the infinite supergames is independent of the number of players. This holds irrespective of whether punishment is based on infinite Nash reversion or one-shot stick-and-carrot strategy. We outline two examples stemming from economic theory and one from international relations.
Polyvector deformations in eleven-dimensional supergravity
Creators: name: Gubarev, Kirill
name: Musaev, Edvard T.
Publisher: name: arXiv
Year: 2020
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: We consider 3- and 6-vector deformations of 11-dimensional supergravity backgrounds of the form $M_5\times M_6$ admitting at least 3 Killing vectors. Using flux formulation of the E${}_{6(6)}$ exceptional field theory we derive (sufficient) conditions for the deformations to generate a solution. In the group manifold case these generalisations of the classical Yang-Baxter equation for the case of r-matrices with 3 and 6 indices are shown to reproduce those obtained from exceptional Drinfeld algebra for E${}_{6(6)}$. In general we see an additional constraint, which might be related to higher exceptional Drinfeld algebras.
description: 20 pages + Appendix
Extragalactic Globular Clusters in the Near-Infrared: V. IC 4051 and NGC 3311
Creators: name: Hempel, M.
name: Geisler, D.
name: Hoard, D. W.
name: Harris, W. E.
Publisher: name: arXiv
Year: 2005
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of combined optical and near-infrared photometry for the globular cluster systems of the giant ellipticals IC 4051 and NGC 3311. We use the reduced age-metallicity degeneracy in (V-I) vs.(V-H) color-color diagrams to derive the cumulative age distribution within the red sub-population of globular clusters and to search for age sub-populations. The age distribution is then compared to the one determined for simulated globular cluster systems in order to set constraints on the relative age and size of these globular cluster sub-populations. In both galaxies we find a significant fraction of globular clusters with ages between 2- 5 Gyr. We also investigate the metallicity distribution in both systems. Small number statistics prevent us from making any definite statements concerning NGC 3311, but we find that the derived metallicity distribution of the IC 4051 clusters strongly depends on the assumed age distribution. Based on our most likely result that finds a large number of young/intermediate age clusters (~2 Gyr) within the selected globular cluster sample, we find metallicity peaks at $\sim$ -0.2 for the old clusters and +0.8 for the young clusters. Only few very metal poor clusters are found. However, the metallicity distribution within the young/intermediate globular cluster population is significantly affected by our choice of the applied Single Stellar Population model. The mean metallicity of the second generation of globular clusters changes from the above mentioned and extremely high +0.8 dex to +0.2 dex. Note that the model dependency becomes less severe with an increasing age of the cluster population.
description: 21 pages, 21 figures, A&A, accepted
Where do "red and dead" early-type void galaxies come from?
Creators: name: Croton, Darren J.
name: Farrar, Glennys R.
Publisher: name: arXiv
Year: 2008
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: Void regions of the Universe offer a special environment for studying cosmology and galaxy formation, which may expose weaknesses in our understanding of these phenomena. Although galaxies in voids are observed to be predominately gas rich, star forming and blue, a sub-population of bright red void galaxies can also be found, whose star formation was shut down long ago. Are the same processes that quench star formation in denser regions of the Universe also at work in voids? We compare the luminosity function of void galaxies in the 2dF Galaxy Redshift Survey, to those from a galaxy formation model built on the Millennium Simulation. We show that a global star formation suppression mechanism in the form of low luminosity "radio mode" AGN heating is sufficient to reproduce the observed population of void early-types. Radio mode heating is environment independent other than its dependence on dark matter halo mass, where, above a critical mass threshold of approximately M_vir~10^12.5 M_sun, gas cooling onto the galaxy is suppressed and star formation subsequently fades. In the Millennium Simulation, the void halo mass function is shifted with respect to denser environments, but still maintains a high mass tail above this critical threshold. In such void halos, radio mode heating remains efficient and red galaxies are found; collectively these galaxies match the observed space density without any modification to the model. Consequently, galaxies living in vastly different large-scale environments but hosted by halos of similar mass are predicted to have similar properties, consistent with observations.
description: 6 pages, 3 figures, accepted MNRAS
Elektrisch beheizte Glasschmelzöfen - Heutiger Stand vor dem Hintergrund Energie, Umwelt, Flexibilität und Betriebssicherheit Teil 2
Creators: name: Voss, Hans-Jörg
Publisher: name: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft
Year: 1997
Subjects: subject: 660

description: Beim elektrischen Glasschmelzen muß der Wechselwirkung zwischen Schmelze und umgebendem Feuerfestmaterial als möglicher Quelle von Glasfehlern besondere Aufmerksamkeit geschenkt werden. Es werden Vorgänge beleuchtet, die sowohl die Betriebssicherheit als auch die Verfügbarkeit einer Glasschmelzanlage mit Elektrodenbeheizung beeinträchtigen können. Korrosion von Molybdänelektroden und ihre Verringerung durch elektrochemische Maßnahmen, neue Elektrodenwerkstoffe und Schutzschichten werden besprochen. Das weite Feld unterschiedlicher Wannentypen für die vollelektrische Glasschmelze, die bewußte Trennung der Verfahrensschritte beim Glasschmelz- und -läuterprozeß sowie Sonderformen der Glasschmelze werden erläutert.
La falsedad personal en la red social digital
Creators: name: Tapias Ariza, Farid Enrique
Publisher: name: Universidad Externado de Colombia
Year: 2024
Subjects: subject: Redes sociales - Estudios de caso
subject: Derecho informático - Legislación
subject: Verdad y mentira -Aspectos jurídicos
subject: Inteligencia artificial
subject: Falsedad personal
subject: Datos personales
subject: Delitos informáticos
subject: Suplantación de identidad y medios informáticos

description: La presente investigación tiene como objetivo demostrar que se tipifica el delito de falsedad personal, contenido en la Ley 599 del 2000, al suplantar el perfil de una red social digital mediante la utilización de herramientas informáticas; utilizándose el método de investigación cualitativo a través del estudio de textos jurídicos y referentes en derecho informático. Los resultados esperados de la investigación consisten en comprobar que es posible cometer el delito de falsedad personal a través de medios informáticos y enunciar la configuración de un nuevo tipo penal con la puesta en marcha de la ciberdelincuencia, concluyendo que es posible consumar el delito de falsedad personal al robar la identidad del perfil en una red social digital.
description: The present investigation aims to demonstrate that the crime of personal falsehood, contained in Law 599 of 2000, is typified by supplanting the profile of a digital social network through the use of computer tools, using the qualitative research method through the study of legal texts and references in computer law. The expected results of the investigation consist in verifying that it is possible to commit the crime of personal falsehood through computerized means and enunciate the configuration of a new criminal type with the implementation of cybercrime, concluding that it is possible to commit the crime of falsehood personal by stealing the identity of the profile in a digital social network.
The Gross-Llewellyn Smith sum rule up to ${\cal O}(α_s^4)$-order QCD corrections
Creators: name: Huang, Xu-Dong
name: Wu, Xing-Gang
name: Yu, Qing
name: Zheng, Xu-Chang
name: Zeng, Jun
Publisher: name: arXiv
Year: 2021
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In the paper, we analyze the properties of Gross-Llewellyn Smith (GLS) sum rule by using the $\mathcal{O}(α_s^4)$-order QCD corrections with the help of principle of maximum conformality (PMC). By using the PMC single-scale approach, we obtain an accurate renormalization scale-and-scheme independent fixed-order pQCD contribution for GLS sum rule, e.g. $S^{\rm GLS}(Q_0^2=3{\rm GeV}^2)|_{\rm PMC}=2.559^{+0.023}_{-0.024}$, where the error is squared average of those from $Δα_s(M_Z)$, the predicted $\mathcal{O}(α_s^5)$-order terms predicted by using the Padé approximation approach. After applying the PMC, a more convergent pQCD series has been obtained, and the contributions from the unknown higher-order terms are highly suppressed. In combination with the nonperturbative high-twist contribution, our final prediction of GLS sum rule agrees well with the experimental data given by the CCFR collaboration.
description: 6 pages, 5 figures
Lorentz violation in brane cosmology, accelerated expansion and fundamental constants
Creators: name: Ahmadi, F.
name: Jalalzadeh, S.
name: Sepangi, H. R.
Publisher: name: arXiv
Year: 2006
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The notion of Lorentz violation in four dimensions is extended to a 5-dimensional brane-world scenario by utilizing a dynamical vector field assumed to point in the bulk direction, with Lorentz invariance holding on the brane. The cosmological consequences of this theory consisting of the time variation in the gravitational coupling $G$ and cosmological term $Λ_4$ are explored. The brane evolution is addressed by studying the generalized Friedmann and Raychaudhuri equations. The behavior of the expansion scale factor is then considered for different possible scenarios where the bulk cosmological constant is zero, positive or negative.
description: 14 pages, to appear in Class. Quantum Grav
Investigating Memorability of Dynamic Media
Creators: name: Le-Khac, Phuc H.
name: Rai, Ayush K.
name: Healy, Graham
name: Smeaton, Alan F.
name: O'Connor, Noel E.
Publisher: name: arXiv
Year: 2020
Subjects: subject: Multimedia (cs.MM)
subject: Artificial Intelligence (cs.AI)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: FOS: Computer and information sciences

description: The Predicting Media Memorability task in MediaEval'20 has some challenging aspects compared to previous years. In this paper we identify the high-dynamic content in videos and dataset of limited size as the core challenges for the task, we propose directions to overcome some of these challenges and we present our initial result in these directions.
description: 3 pages, 1 figure. 1 table
Productos y servicios financieros a través de canales digitales : los deberes de información y seguridad a cargo de las partes de la relación de consumo
Creators: name: Arévalo Cruz, Andrés Felipe
name: Carvajal Sarmiento, Sarah
Publisher: name: Universidad Externado de Colombia
Year: 2024
Subjects: subject: Contratos - Aspectos jurídicos
subject: Servicios financieros - Estudios de caso
subject: Derecho informático - Legislación
subject: Consumidor financiero
subject: Entidades vigiladas
subject: Canales digitales
subject: Productos y servicios financieros
subject: Deber de información
subject: Ciberseguridad

description: La oferta, la contratación y la prestación de los productos y servicios financieros mediante canales digitales, esto es, portales web en internet y telefonía o banca móvil, implica cambios en los riesgos tradicionales de las operaciones financieras, y en la forma en la que las partes de la relación de consumo de carácter financiero deben comportarse ante la implementación y uso de tales canales digitales. Por ello, en la primera parte del documento se pretende establecer o determinar un panorama jurídico claro y detallado acerca del ámbito de aplicación y el alcance de la relación de consumo de carácter financiero; y en la segunda parte, se pretende determinar cuál es el contenido y alcance de los deberes de información y de seguridad, esto es, los principales deberes a cargo de cada una de las partes de dicha relación de consumo, respecto de respecto del uso de productos y servicios financieros a través de los canales digitales dispuestos por las entidades vigiladas.
description: The offer, contracting, and provision of financial products and services through digital channels, namely, internet web portals and mobile banking or phone, imply changes in the traditional risks of financial operations and in how the parties involved in the financial consumer relationship should behave in the implementation and use of such digital channels. Therefore, the first part of the document aims to establish or determine a clear and detailed legal framework regarding the scope and extent of the financial consumer relationship. In the second part, the goal is to determine the content and scope of information and security duties, i.e., the main duties of each party in this consumer relationship regarding the use of financial products and services through digital channels provided by supervised entities.
Vergleich verschiedener Kunststoffbeschichtungen zur Verbesserung der Bruch- und Auslaufsicherheit von Chemikalienflaschen aus Glas
Creators: name: Lochner, Karl H.
Publisher: name: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft
Year: 1997
Subjects: subject: 660

description: [no abstract available]
Two-dimensional space-time symmetry in hyperbolic functions
Creators: name: Catoni, Francesco
name: Zampetti, Paolo
Publisher: name: arXiv
Year: 2005
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: An extension of the finite and infinite Lie groups properties of complex numbers and functions of complex variable is proposed. This extension is performed exploiting hypercomplex number systems that follow the elementary algebra rules. In particular the functions of such systems satisfy a set of partial differential equations that defines an infinite Lie group. Emphasis is put on the functional transformations of a particular two-dimensional hypercomplex number system, capable of maintaining the wave equation as invariant and then the speed of light invariant too. These functional transformations describe accelerated frames and can be considered as a generalization of two dimensional Lorentz group of special relativity. As a first application the relativistic hyperbolic motion is obtained.
description: 7 pages
Evaporation of fluorine, chlorine and selenium from glass melts and emission reducing measures
Creators: name: Kirchner, Ulrich
Publisher: name: Offenbach : Verlag der Deutschen Glastechnischen Gesellschaft
Year: 1997
Subjects: subject: 660

description: The simultaneous waste gas treatment of inorganic gaseous fluorine and chlorine Compounds as well as of gaseous selenium Compounds is still a big problem for many companies of the German glass industry. With the aid of an HVG/AiF research project investigations were carried out with the aim of characterizing the evaporation behaviour of fluorine, chlorine and selenium from industrially melted soda-lime-silica glasses (container glasses) and of correlating their behaviour with the operating data of the melting furnaces. The main effort, however, was put into investigating the absorption rates on an existing waste gas treatment plant depending on the kind and the quantity of the absorption agent. Moreover, the influence of the absorption temperature on the absorption rates was determined.
"Die Mission der Kirche in den Sozialistischen Ländern Europas"
Creators: name: Linn, Gerhard
Publisher: name: Ökumenische Rundschau
Year: 2025

description: Ökumenische Rundschau, Bd. 39 Nr. 1 (1990): Ökumenische Rundschau, Band 39, Heft 1