Letteratura scientifica selezionata sul tema "Dark Sirens"
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Articoli di riviste sul tema "Dark Sirens"
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Li, Tian-Nuo, Shang-Jie Jin, Hai-Li Li, Jing-Fei Zhang e Xin Zhang. "Prospects for Probing the Interaction between Dark Energy and Dark Matter Using Gravitational-wave Dark Sirens with Neutron Star Tidal Deformation". Astrophysical Journal 963, n. 1 (28 febbraio 2024): 52. http://dx.doi.org/10.3847/1538-4357/ad1bc9.
Testo completoAbstract (sommario):
Abstract Gravitational wave (GW) standard siren observations provide a rather useful tool to explore the evolution of the Universe. In this work, we wish to investigate whether dark sirens with neutron star (NS) deformation from third-generation GW detectors could help probe the interaction between dark energy and dark matter. We simulate the GW dark sirens of four detection strategies based on 3 yr observation and consider four phenomenological interacting dark energy (IDE) models to perform cosmological analysis. We find that GW dark sirens could provide tight constraints on Ωm and H 0 in the four IDE models but do not perform well in constraining the dimensionless coupling parameter β in models of the interaction proportional to the energy density of cold dark matter. Nevertheless, the parameter degeneracy orientations of cosmic microwave background (CMB) and GW are almost orthogonal, and thus, the combination of them could effectively break cosmological parameter degeneracies, with the constraint errors of β being 0.00068–0.018. In addition, we choose three typical equations of state (EoSs) of an NS, i.e., SLy, MPA1, and MS1, to investigate the effect of an NS’s EoS on cosmological analysis. The stiffer EoS could give tighter constraints than the softer EoS. Nonetheless, the combination of CMB and GW dark sirens (using different EoSs of an NS) shows basically the same constraint results of cosmological parameters. We conclude that the dark sirens from 3G GW detectors would play a crucial role in helping probe the interaction between dark energy and dark matter, and the CMB+GW results are basically not affected by the EoS of an NS.
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Zhu, Liang-Gui, e Xian Chen. "The Dark Side of Using Dark Sirens to Constrain the Hubble–Lemaître Constant". Astrophysical Journal 948, n. 1 (1 maggio 2023): 26. http://dx.doi.org/10.3847/1538-4357/acc24b.
Testo completoAbstract (sommario):
Abstract Dark sirens, i.e., gravitational-wave (GW) sources without electromagnetic counterparts, are new probes of the expansion of the universe. The efficacy of this method relies on correctly localizing the host galaxies. However, recent theoretical studies have shown that astrophysical environments could mislead the spatial localization by distorting the GW signals. It is unclear whether and to what degree the incorrect spatial localizations of dark sirens would impair the accuracy of the measurement of the cosmological parameters. To address this issue, we consider the future observations of dark sirens using the Cosmic Explorer and the Einstein Telescope, and we design a Bayesian framework to access the precision of measuring the Hubble–Lemaître constant H 0. Interestingly, we find that the precision is not compromised when the number of well-localized dark sirens is significantly below 300, even in the extreme scenario that all the dark sirens are localized incorrectly. As the number exceeds 300, the incorrect spatial localizations start to produce statistically noticeable effects, such as a slow convergence of the posterior distribution of H 0. We propose several tests that can be used in future observations to verify the spatial localizations of dark sirens. Simulations of these tests suggest that incorrect spatial localizations will dominate a systematic error of H 0 if as much as 10% of a sample of 300 well-localized dark sirens are affected by their environments. Our results have important implications for the long-term goal of measuring H 0 to a precision of <1% using dark sirens.
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Palmese, A., C. R. Bom, S. Mucesh e W. G. Hartley. "A Standard Siren Measurement of the Hubble Constant Using Gravitational-wave Events from the First Three LIGO/Virgo Observing Runs and the DESI Legacy Survey". Astrophysical Journal 943, n. 1 (1 gennaio 2023): 56. http://dx.doi.org/10.3847/1538-4357/aca6e3.
Testo completoAbstract (sommario):
Abstract We present a new constraint on the Hubble constant H 0 using a sample of well-localized gravitational-wave (GW) events detected during the first three LIGO/Virgo observing runs as dark standard sirens. In the case of dark standard sirens, a unique host galaxy is not identified, and the redshift information comes from the distribution of potential host galaxies. From the third LIGO/Virgo observing run detections, we add the asymmetric-mass binary black hole GW190412 and the high-confidence GW candidates S191204r, S200129m, and S200311bg to the sample of dark standard sirens analyzed in Palmese et al. Our sample contains the top 20% (based on localization) GW events and candidates to date with significant coverage by the Dark Energy Spectroscopic Instrument Legacy Survey. We combine the H 0 posterior for eight dark siren events, finding H 0 = 79.8 − 12.8 + 19.1 km s − 1 Mpc − 1 (68% highest density interval) for a prior in H 0 uniform between [20, 140] km s−1 Mpc−1. This result shows that a combination of eight well-localized dark sirens combined with an appropriate galaxy catalog is able to provide an H 0 constraint that is competitive (∼20% versus 18% precision) with a single bright standard siren analysis (i.e., assuming the electromagnetic counterpart) using GW170817. When combining the posterior with that from GW170817, we obtain H 0 = 72.77 − 7.55 + 11.0 km s − 1 Mpc − 1 . This result is broadly consistent with recent H 0 estimates from both the cosmic microwave background and supernovae.
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Jin, Shang-Jie, Tian-Nuo Li, Jing-Fei Zhang e Xin Zhang. "Prospects for measuring the Hubble constant and dark energy using gravitational-wave dark sirens with neutron star tidal deformation". Journal of Cosmology and Astroparticle Physics 2023, n. 08 (1 agosto 2023): 070. http://dx.doi.org/10.1088/1475-7516/2023/08/070.
Testo completoAbstract (sommario):
Abstract Using the measurements of tidal deformation in the binary neutron star (BNS) coalescences can obtain the information of redshifts of gravitational wave (GW) sources, and thus actually the cosmic expansion history can be investigated using solely such GW dark sirens. To do this, the key is to get a large number of accurate GW data, which can be achieved with the third-generation (3G) GW detectors. Here we wish to offer an answer to the question of whether the Hubble constant and the equation of state (EoS) of dark energy can be precisely measured using solely GW dark sirens. We find that in the era of 3G GW detectors 𝒪(105 – 106) dark siren data (with the NS tidal measurements) could be obtained in three-year observation if the EoS of NS is perfectly known, and thus using only dark sirens can actually achieve the precision cosmology. Based on a network of 3G detectors, we obtain the constraint precisions of 0.15% and 0.95% for the Hubble constant H 0 and the constant EoS of dark energy w, respectively; for a two-parameter EoS parametrization of dark energy, the precision of w 0 is 2.04% and the error of wa is 0.13. We conclude that 3G GW detectors would lead to breakthroughs in solving the Hubble tension and revealing the nature of dark energy provided that the EoS of NS is perfectly known.
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Jin, Shang-Jie, Rui-Qi Zhu, Ji-Yu Song, Tao Han, Jing-Fei Zhang e Xin Zhang. "Standard siren cosmology in the era of the 2.5-generation ground-based gravitational wave detectors: bright and dark sirens of LIGO Voyager and NEMO". Journal of Cosmology and Astroparticle Physics 2024, n. 08 (1 agosto 2024): 050. http://dx.doi.org/10.1088/1475-7516/2024/08/050.
Testo completoAbstract (sommario):
Abstract The 2.5-generation (2.5G) ground-based gravitational wave (GW) detectors LIGO Voyager and NEMO are expected to be operational in the late 2020s and early 2030s. In this work, we explore the potential of GW standard sirens observed by the 2.5G GW detectors in measuring cosmological parameters, especially for the Hubble constant. Using GWs to measure cosmological parameters is inherently challenging, especially for 2.5G detectors, given their limited capability, which results in weaker constraints on cosmological parameters from the detected standard sirens. However, the measurement of the Hubble constant using standard siren observations from Voyager and NEMO is still promising. For example, using bright sirens from Voyager and NEMO can measure the Hubble constant with a precision of about 2% and 6% respectively, and using the Voyager-NEMO network can improve the precision to about 1.6%. Moreover, bright sirens can be used to break the degeneracy of cosmological parameters generated by CMB data, and to a certain extent, 2.5G detectors can also play a role in this aspect. Observations of dark sirens by 2.5G detectors can achieve relatively good results in measuring the Hubble constant, with a precision of within 2%, and if combining observations of bright and dark sirens, the precision of the Hubble constant measurement can reach about 1.4%. Finally, we also discussed the impact of the uncertainty in the binary neutron star merger rate on the estimation of cosmological parameters. We conclude that the magnificent prospect for solving the Hubble tension is worth expecting in the era of the 2.5G ground-based GW detectors.
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Cai, Rong-Gen, e Tao Yang. "Standard sirens and dark sector with Gaussian process". EPJ Web of Conferences 168 (2018): 01008. http://dx.doi.org/10.1051/epjconf/201816801008.
Testo completoAbstract (sommario):
The gravitational waves from compact binary systems are viewed as a standard siren to probe the evolution of the universe. This paper summarizes the potential and ability to use the gravitational waves to constrain the cosmological parameters and the dark sector interaction in the Gaussian process methodology. After briefly introducing the method to reconstruct the dark sector interaction by the Gaussian process, the concept of standard sirens and the analysis of reconstructing the dark sector interaction with LISA are outlined. Furthermore, we estimate the constraint ability of the gravitational waves on cosmological parameters with ET. The numerical methods we use are Gaussian process and the Markov-Chain Monte-Carlo. Finally, we also forecast the improvements of the abilities to constrain the cosmological parameters with ET and LISA combined with the Planck.
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Dalang, Charles, e Tessa Baker. "The clustering of dark sirens' invisible host galaxies". Journal of Cosmology and Astroparticle Physics 2024, n. 02 (1 febbraio 2024): 024. http://dx.doi.org/10.1088/1475-7516/2024/02/024.
Testo completoAbstract (sommario):
Abstract Dark sirens are a powerful way to infer cosmological and astrophysical parameters from the combination of gravitational wave sirens and galaxy catalogues. Importantly, the method relies on the completeness of the galaxy catalogues being well modelled. A magnitude-limited catalogue will always be incomplete to some extent, requiring a completion scheme to avoid biasing the parameter inference. Standard methods include homogeneous and multiplicative completion, which have the advantage of simplicity but underestimate or overestimate the amplitude of structure at low completeness, respectively. In this work, we propose a new method to complete galaxy catalogues which uses clustering information to incorporate knowledge of the large scale structure into the dark sirens method. We find that if the structure of the true number of galaxies is sufficiently well preserved in the catalogue, our estimator can perform drastically better than both homogeneous and multiplicative completion. We lay the foundations for a maximally informative dark sirens analysis and discuss its limitations.
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Hou, Wan-Ting, Jing-Zhao Qi, Tao Han, Jing-Fei Zhang, Shuo Cao e Xin Zhang. "Prospects for constraining interacting dark energy models from gravitational wave and gamma ray burst joint observation". Journal of Cosmology and Astroparticle Physics 2023, n. 05 (1 maggio 2023): 017. http://dx.doi.org/10.1088/1475-7516/2023/05/017.
Testo completoAbstract (sommario):
Abstract With the measurement of the electromagnetic (EM) counterpart, a gravitational wave (GW) event could be treated as a standard siren. As a novel cosmological probe, GW standard sirens will bring significant implications for cosmology. In this paper, by considering the coincident detections of GW and associated γ ray burst (GRB), we find that only about 400 GW bright standard sirens from binary neutron star mergers could be detected in a 10-year observation of the Einstein Telescope and the THESEUS satellite mission. Based on this mock sample, we investigate the implications of GW standard sirens on the interaction between dark energy and dark matter. In our analysis, four viable interacting dark energy (IDE) models, with interaction forms Q = 3βHρ de and Q = Q = 3βHρ c, are considered. Compared with the traditional EM observational data such as CMB, BAO, and SN Ia, the combination of both GW and EM observations could effectively break the degeneracies between different cosmological parameters and provide more stringent cosmological fits. We find that the GW data could play a more important role for determining the interaction in the models with Q = 3βHρ c, compared with the models with Q = 3βHρ de. We also show that constraining IDE models with mock GW data based on different fiducial H 0 values yield different results, indicating that accurate determination of H 0 is significant for exploring the interaction between dark energy and dark matter.
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Zhang, Pengjie, e Hai Yu. "Calibrating systematic errors in the distance determination with the luminosity–distance space large-scale structure of dark sirens and its potential applications". Monthly Notices of the Royal Astronomical Society 507, n. 3 (14 agosto 2021): 3381–86. http://dx.doi.org/10.1093/mnras/stab2329.
Testo completoAbstract (sommario):
ABSTRACT The cosmological luminosity–distance can be measured from gravitational wave (GW) standard sirens, free of astronomical distance ladders, and the associated systematics. However, it may still contain systematics arising from various astrophysical, cosmological, and experimental sources. With the large amount of dark standard sirens of upcoming third generation GW experiments, such potential systematic bias, can be diagnosed and corrected by statistical tools of the large-scale structure of the universe. We estimate that, by cross-correlating the dark siren luminosity–distance space distribution and galaxy redshift space distribution, multiplicative error m in the luminosity distance measurement can be constrained with 1σ uncertainty σm ∼ 0.1. This is already able to distinguish some binary black hole origin scenarios unambiguously. Significantly better constraints and therefore more applications may be achieved by more advanced GW experiments.
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Yang, Tao, Hyung Mok Lee, Rong-Gen Cai, Han Gil Choi e Sunghoon Jung. "Space-borne atom interferometric gravitational wave detections. Part II. Dark sirens and finding the one". Journal of Cosmology and Astroparticle Physics 2022, n. 01 (1 gennaio 2022): 042. http://dx.doi.org/10.1088/1475-7516/2022/01/042.
Testo completoAbstract (sommario):
Abstract In this paper, we investigate the potential of dark sirens by the space-borne atom interferometric gravitational-wave detectors to probe the Hubble constant. In the mid-frequency band, the sources live a long time. The motion of a detector around the Sun as well as in Earth orbit would induce large Doppler and reorientation effects, providing a precise angular resolution. Such precise localization for the GW sources makes it possible to observe the dark sirens with only one potential host galaxy, which are dubbed “golden dark sirens”. We construct the catalogs of golden dark sirens and estimate that there are around 79 and 35 golden dark sirens of binary neutron stars (BNS) and binary black holes (BBH) that would be pass the detection threshold of AEDGE in 5 years. Our results show that with 5, 10, and all 79 golden dark BNS tracked by AEDGE one can constrain H 0 at 5.5%, 4.1%, and 1.8% precision levels. With 5, 10, and all 35 golden dark BBH one can constrain H 0 at 2.2%, 1.8%, and 1.5% precision levels, respectively. It suggests that only 5–10 golden dark BBH by AEDGE are sufficient to arbitrate the current tension between local and high-z measurements of H 0.
Tesi sul tema "Dark Sirens"
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Pierra, Grégoire. "Cosmologie avec les sirènes sombres et populations de binaires de trous noirs avec les ondes gravitationnelles de LIGO-Virgo-KAGRA". Electronic Thesis or Diss., Lyon 1, 2024. http://www.theses.fr/2024LYO10162.
Testo completoAbstract (sommario):
Les ondes gravitationnelles constituent une nouvelle sonde pour explorer l’Univers et étudier des phénomènes cosmiques jusque-là inaccessibles. Cette thèse se base sur des données d’ondes gravitationnelles récoltées par les détecteurs de la collaboration scientifique LIGO-Virgo-KAGRA. La première partie de ce travail porte sur la cosmologie avec les sirènes sombres, une méthode qui utilise les fusions de trous noirs pour mesurer les distances cosmologiques et inférer la valeur de la constante de Hubble, sans nécessiter de contrepartie électromagnétique. Elle présente également ICAROGW, un code d’inférence bayésienne hiérarchique, utilisant les données d’ondes gravitationnelles et des modèles décrivant les propriétés astrophysiques des trous noirs, comme leurs masses, leurs distances ou encore leurs spins, pour mesurer la constante de Hubble. La deuxième partie de cette étude teste particulièrement la robustesse des sirènes sombres pour la cosmologie. Elle explore l’impact des modèles de population de trous noirs sur l’estimation de la constante de Hubble, tout particulièrement lorsque certains processus astrophysiques ne sont pas modélisés. La troisième partie s’attache à la recherche et à l’identification de sous-populations de binaires de trous noirs dans l’univers. Elle examine la manière dont différents canaux de formation peuvent influencer les caractéristiques intrinsèques de ces objets compacts, notamment à travers les corrélations potentielles entre leur masse et leur spin. L’existence de ces corrélations serait révélatrice de la présence de sous-populations de trous noirs, comme les trous noirs hiérarchiques issus de coalescences précédentes. Enfin, le manuscrit se termine par une étude sur l’utilisation de méthodes de machine learning pour améliorer la qualité des données de l’interféromètre Virgo et détecter la présence de bruits non-gaussiens. Ces travaux explorent également l’intégration potentielle des résultats d’iDQ dans les algorithmes de détection des signaux d’ondes gravitationnelles, visant ainsi à renforcer le niveau de confiance dans ces détectionsGravitational waves constitute a new probe for exploring the Universe and studying cosmic phenomena that were previously inaccessible. This thesis is based on gravitational wave data collected by the LIGO-Virgo-KAGRA scientific collaboration detectors. The first part of this work focuses on cosmology with dark sirens, a method that uses binary black hole mergers to measure cosmological distances and infer the value of the Hubble constant, without requiring an electromagnetic counterpart. It also presents ICAROGW, a hierarchical Bayesian inference code that uses gravitational wave data and models describing the astrophysical properties of black holes, such as their masses, distances, and spins, to estimate the Hubble constant. The second part of this study tests in particular the robustness of the dark siren method for cosmology. It explores the impact of binary black hole population parameterization on the estimation of the Hubble constant, especially when certain astrophysical processes are not modelled. The third part focuses on the search and identification of subpopulations of binary black holes in the universe. It examines how different formation channels can influence the intrinsic characteristics of these compact objects, particularly through po- tential correlations between their mass and spin. The existence of these correlations would be indicative of the presence of subpopulations of black holes, such as hierarchical black holes, resulting from previous mergers. Finally, the manuscript concludes with a study on the use of machine learning methods to improve the quality of the Virgo interferometer data and detect the presence of non-Gaussian noises. This work also explores the potential integration of iDQ results into gravitational wave signal detection algorithms, thereby aiming to strengthen the confidence level in these detections
Libri sul tema "Dark Sirens"
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Hulme-Cross, Benjamin, e Nelson Evergreen. Sirens' Feast (Dark Hunter 11). Bloomsbury Publishing Plc, 2015.
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Hulme-Cross, Benjamin, e Nelson Evergreen. Sirens' Feast (Dark Hunter 11). Bloomsbury Publishing Plc, 2015.
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Sirens' Feast (Dark Hunter 11). Bloomsbury Publishing Plc, 2015.
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Sirens Desire Dark Tides Novel. Signet Book, 2012.
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Andreucci, Cassandra B. Dark Siren. C B Andreucci, 2022.
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Vampire Coloring Book for Adults: Mermaids Vampires Adults Coloring Book Dark Fantasy Romance, Sirens, Fairies, Pixies, Vampires, Dragons, Men, Women, Animals, Flowers. Independently Published, 2021.
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Siren's Call (Dark Tides). Signet Eclipse, 2010.
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Collections, Sinister, e Hazel Grace. Siren: A Dark Retelling. Independently Published, 2019.
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Dawn, A. C. Dark Song: Dark Siren Duology Book 1. A.C. Dawn, 2022.
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Dark water: A Siren novel. New York: Egmont USA, 2012.
Cerca il testo completoCapitoli di libri sul tema "Dark Sirens"
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Elbeshlawy, Ahmed. "Dancer in the Dark: Deploying the Siren, Impairing the Sight". In Woman in Lars von Trier’s Cinema, 1996–2014, 68–83. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-40639-8_4.
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Aigner, Achim. "Nichtvirale Vektoren". In Gen- und Zelltherapie 2.023 - Forschung, klinische Anwendung und Gesellschaft, 87–102. Berlin, Heidelberg: Springer Berlin Heidelberg, 2023. http://dx.doi.org/10.1007/978-3-662-67908-1_6.
Testo completoAbstract (sommario):
ZusammenfassungDie Verwendung von Nukleinsäuren als Therapeutika hat in den letzten Jahrzehnten – und im Fall von RNA-Molekülen speziell in den letzten Jahren – neue therapeutische Möglichkeiten eröffnet. Jenseits anderer, konventioneller Wirkstoffe, die vor allem auf Proteinebene wirken, lassen sich so innovative Wirkprinzipien erschließen, die auf DNA- bzw. RNA-Ebene eingreifen und damit eine direkte und spezifische Beeinflussung der Proteinbiosynthese gestatten. Hierbei kann zunächst grob zwischen verschiedenen Strategien unterschieden werden: klassische Gentherapie („gene replacement“ bzw. „gene addition“), Herabregulation einer Genexpression („gene knockdown“) über Antisense-Oligonukleotide (ASO) oder RNA-Interferenz (RNAi), Splicing-Korrektur („exon skipping“ im Sinne einer Korrektur des Leserasters bei der Genexpression über Antisense-Oligonukleotide) und gentechnische Veränderungen („gene/genome engineering/editing“) unter Einbringung fremden genetischen Materials über spezifische Designernukleasen wie CRISPR/Cas. Neuerdings hat auch – und nicht nur im Kontext der neuen Impfstoffe gegen SARS-CoV-2 – mRNA („messenger RNA“) als Therapeutikum oder therapeutisches Zielmolekül an Attraktivität gewonnen. Gerade im Fall der RNA-basierten Therapeutika, wozu mRNAs, die RNAi-induzierenden „small interfering RNAs“ (siRNAs) sowie andere kleine RNAs wie microRNAs (miRNAs; agomiRs) oder miRNA-inhibierende antimiRs gehören, wird jedoch die besondere Bedeutung von Formulierungen („Verpackungen“) deutlich, um diese RNAs therapeutisch anwenden zu können. Denn bei allen Vorteilen in der Wirkweise zeigen nukleinsäurebasierte Therapeutika auch wesentliche Nachteile: So sind Nukleinsäuren vergleichsweise große und stark geladene Moleküle mit, gerade im Fall chemisch nichtmodifizierter RNAs, sehr geringer Stabilität und damit extrem kurzer Halbwertszeit. Zugleich wird durch ihre Molekülgröße und Ladung die Aufnahme in die Zellen – eine notwendige Voraussetzung für ihre Wirksamkeit, da sich ihr Wirkort in der Zelle befindet, – deutlich erschwert. Zwar können einzelsträngige kurze DNA-Stücke auch ohne chemische Hilfsmittel (Transfektionsreagenzien) in Zellen aufgenommen werden (dieser Prozess wird als Gymnosis bezeichnet), dies gilt jedoch nicht für andere Nukleinsäuren. Gerade die Instabilität und kurze Halbwertszeit von RNA-Molekülen machten sie zunächst ungeeignet als Therapeutika, da sie so kaum in der Lage sind, intakt ihren Wirkort zu erreichen. Zwar wurden über die letzten Jahrzehnte eine Vielzahl chemischer Modifikationen entwickelt, die mit der Zielsetzung einer Stabilitätserhöhung (Schutz gegen Abbau), Erhöhung der Bindungsstärke an ein Zielmolekül (Affinität und Spezifität) und Verbesserung der Verträglichkeit (verminderte Immunantwort) deutliche Vorteile gebracht haben (Behlke 2008), dennoch stellt der effiziente Transport der jeweiligen Nukleinsäure an den Wirkort weiterhin eine wesentliche Problematik dar. Dies hat schon früh zur Entwicklung nichtviraler Einschleusungssysteme, sog. nichtviraler Vektoren, geführt, die im Laufe der Jahre immer leistungsfähiger und an die verschiedenen Nukleinsäurearten adaptiert wurden. Nanotechnologiebasierte Gen- und Oligonukleotid-Einschleusung ist damit ein Forschungsgebiet innerhalb der Nanomedizin, das sich mit Nanomaterialien zur Formulierung von Nukleinsäuren für deren Anwendung in vitro (in der Zellkultur) und in vivo (im lebenden Organismus, einschließlich dem Menschen) befasst. Durch neuere Zelltherapieansätze mit der Notwendigkeit, beispielsweise Immunzellen (T-Zellen, NK-Zellen) genetisch zu modifizieren und hierfür evtl. auch nichtvirale Strategien einzusetzen, sind dabei auch In-vitro-Verwendungen von potenziell klinisch-translationalem Interesse.
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Hernandez, Rafael. "“Dark Men in Mien and Movement”". In Joyce Writing Disability, 106–30. University Press of Florida, 2022. http://dx.doi.org/10.5744/florida/9780813069135.003.0006.
Testo completoAbstract (sommario):
The blind stripling in James Joyce’s Ulysses (1922) has long been a figure of great interest to Joycean scholarship. His visual impairment has been allied autobiographically to Joyce’s own eye troubles, and his character has been said to represent the critical symbolic link between Leopold Bloom and Stephen Dedalus. This essay follows recent scholarship on embodiment and disability to investigate the further import of the stripling in Joyce’s “epic of the body.” In particular, this essay argues that when read in a disability studies context the stripling adds to an understanding of the novel’s formal characteristics and the ways Joyce links physical disfigurement and racial oppression in colonial Ireland. Reading the stripling in two different episodes draws attention to how narrative structure shapes representations of one of Ulysses’s most notable disabled characters. The stripling’s central and highly visual appearance in Ulysses’s “Lestrygonians” episode rehearses racializing rhetorics that work to “other” disabled people not unlike those historically levied against the Irish themselves; here, the stripling is notably subject of and to Bloom’s ableist gaze. In contrast, his largely peripheral and uniquely aural representation in the “Sirens” episode complicates his earlier depiction in “Lestrygonians.” In “Sirens,” the stripling’s peripheral location paradoxically centralizes him in a position of power in the chapter’s narrative matrix; here, the stripling is maestro and metronome of “Sirens’” orchestral cacophony. At once a tightly surveilled object and elusive subject, the stripling draws attention to the body and its modes of being in the world and the novel alike; his presence in the novel destabilizes our understanding of normative bodies and narrative form and shows how the pathologized body as ostensible aberration is both a disruptive and generative force in Joyce’s work.
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"Dark Days". In The Rowell-Sirois Commission and the Remaking of Canadian Federalism, 232–67. University of British Columbia Press, 2021. http://dx.doi.org/10.59962/9780774865036-014.
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Karlin, Daniel. "Dark Tower, Siren Isle, Ruined Chapel: Landscapes of Love and Hate". In Browning's Hatreds, 239–63. Oxford University Press, 1993. http://dx.doi.org/10.1093/acprof:oso/9780198112297.003.0011.
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Keshari Nayak, Jajati, Rashmi Chauhan, Sundip Kumar e Sharat Prabhakaran. "Whispers of Nourishment: Unveiling the Role of Non-Coding RNA in Plant Nutrient Availability". In Noncoding RNA - The Dark Matter of the Genome [Working Title]. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.113169.
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Micronutrients play a vital role in crop growth and development, as they are essential for various physiological processes and biochemical reactions within plants. Insufficient levels of micronutrients in the soil can lead to nutrient deficiencies in plants, resulting in stunted growth, reduced yields, and poor overall health. In the last decades, it has been seen that noncoding RNAs (ncRNAs) are involved in the regulation of micronutrient uptake, transport, and utilization in plants. They can modulate the expression of genes encoding transporters, chelators, and enzymes related to micronutrient acquisition and utilization. By fine-tuning gene expression, ncRNAs can help plants adapt to varying nutrient availability and optimize their nutrient uptake efficiency. Understanding the interplay between micronutrients and ncRNAs provides insights into the intricate molecular mechanisms underlying nutrient homeostasis and plant adaptation to nutrient stress. This study delves into the origin of various noncoding RNAs, such as miRNA, siRNA, and tsRNA, elucidating their pivotal role in maintaining micro- and macronutrient equilibrium within plant tissues. Overall, this research underscores the intricate interplay between micronutrients and noncoding RNAs in crop plants, shedding light on the intricacies of nutrient regulation and opening up new avenues for future investigation and potential applications in agriculture.
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Herrero Martínez, David. "Aprendizaje y Servicio desde la mirada de los alumnos". In https://files.griddo.comillas.edu/apl-comillas.pdf?, 102–9. Universidad Pontificia Comillas, 2024. http://dx.doi.org/10.14422/9788484687627.013.
Testo completoAbstract (sommario):
A partir de la experiencia compartida por cuatro estudiantes de diferentes facultades en las “Jornadas de Buenas Prácticas en Docencia Comillas 2022-23”, se presenta brevemente el impacto transformador del Aprendizaje y Servicio (ApS) en sus vidas académicas y personales. Los relatos de Miquel, Lidia, Lucía e Irene sirven para dar cuenta de una diversidad de proyectos ApS: desde colaborar en la definición de derechos legales, impulsar proyectos sociales en España y Guatemala, hasta contribuir a soluciones prácticas para la escasez de agua en Benín. Pese a los desafíos que enfrentaron, como la adaptación a contextos desconocidos, los estudiantes destacan valiosos aprendizajes que se organizan en cinco aspectos clave: interdisciplinariedad, trabajo en equipo, aprendizaje activo, creatividad e innovación, así como la orientación hacia un impacto social sostenible a largo plazo. Se subraya finalmente la necesidad de integrar el ApS en los planes de estudio y la innovación docente.
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Kumar Maurya, Neelesh. "Libido Boosting Functional Foods". In Sexual Disorders and Dysfunctions [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.108778.
Testo completoAbstract (sommario):
Libido is a sexual desire or drive. Libido is biological desire’s emotional energy, especially sexual desire. Biopsychosocial variables affect libido. Biologically, sex hormones and nucleus accumbent neurotransmitters (mainly testosterone and dopamine) govern human desire. Working, family, mentality, and stress might affect libido. Medical disorders, drugs, lifestyle, relationships, and age might affect libido (e.g., puberty). Hypersexuality is having frequent or suddenly increased sexual impulses; hyposexuality is the opposite. In psychoanalytic thought, libido is a mental drive or energy, connected with sexual instinct but is also present in other innate urges. A man may want sex but not be able to act on it, or may not for medical, moral, or religious reasons. Repressing or sublimating an urge is psychological. One can participate in sexual activity without a sire. Stress, illness, and pregnancy affect sperm drive. Testosterone, estrogen, progesterone, oxytocin, and norepinephrine act as serotonin This book chapter talks about how functional foods such as spinach, dark chocolate, peppers, green tea, oysters, crab, and pumpkin seeds, which contain neurotransmitters, affect libido.
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Casuso, Gianfranco. "Libertad como participación social. El problema de la exclusión en Hegel". In Dimensiones de la libertad: sobre la actualidad de la filosofía del derecho de Hegel, 68–81. Pontificia Universidad Católica del Perú, 2023. http://dx.doi.org/10.18800/9786123170813.005.
Testo completoAbstract (sommario):
Si he subtitulado el presente trabajo de este modo —uniendo en una oración a Hegel con la exclusión— es porque creo que este autor puede proporcionarnos una acertada visión de lo que dicho problema significa para la vida social. Para él, la exclusión representa un obstáculo que se da cuando la sociedad moderna, intentando dar cumplimiento a sus aspiraciones y tareas, termina traicionando sus propios principios. Esta se manifiesta cuando a las personas no les es posible tomar parte en las prácticas e instituciones socialmente relevantes que sirven a la realización de la libertad —realización posibilitada, por lo demás, solo en virtud de la unión entre el desarrollo individual y la reproducción e integración de la sociedad—. Esto y no otra cosa —creo— significa no poder tomar parte plenamente del espíritu objetivo. La exclusión, creo por tanto, no es un problema accesorio al proyecto hegeliano, sino inherente y merece, por ello, dedicarle algunas reflexiones. Lo primero que haré será explicar el significado de la exclusión en la filosofía del espíritu objetivo de Hegel y en qué medida aquella representa un obstáculo para la realización de la libertad (1); seguidamente veré qué tipo de medidas intrínsecas a la sociedad se requiere tanto para controlar los efectos perniciosos (2) como para modificar las causas de la exclusión (3); finalmente, sintetizaré los motivos centrales de la doctrina hegeliana de la corporación para mostrar qué puede aprovecharse de ella en los análisis actuales sobre la exclusión
Atti di convegni sul tema "Dark Sirens"
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Califano, Matteo, Ivan de Martino, Daniele Vernieri e Salvatore Capozziello. "Forecasts for ΛCDM and Dark Energy Models through Einstein Telescope Standard Sirens". In Electronic Conference on Universe. Basel Switzerland: MDPI, 2023. http://dx.doi.org/10.3390/ecu2023-14032.
Testo completo
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Mancarella, Michele, Nicola Borghi, Stefano Foffa, Edwin Genoud-Prachex, Francesco Iacovelli, Michele Maggiore, Michele Moresco e Matteo Schulz. "Gravitational-wave cosmology with dark sirens: state of the art and perspectives for 3G detectors". In 41st International Conference on High Energy physics. Trieste, Italy: Sissa Medialab, 2022. http://dx.doi.org/10.22323/1.414.0127.
Testo completo
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Montoya Villalba, Daniel Alejandro, e Daniel Fernando Montaña Varón. "Diseño de un sistema de detección de intrusos (IDS) basada en técnicas supervisadas de anomalías mediante la aplicación de aprendizaje profundo". In Ingeniería para transformar territorios. Asociación Colombiana de Facultades de Ingeniería - ACOFI, 2023. http://dx.doi.org/10.26507/paper.2877.
Testo completoAbstract (sommario):
El aprendizaje profundo se ha empleado en la creación de sistemas de detección de intrusiones (IDS), y se ha demostrado ser igual de eficaz que los métodos de aprendizaje automático. En efecto, procesos de aprendizaje algorítmico. Sin embargo, al ser más sofisticados, estos últimos requieren más tiempo de entrenamiento. Debido a que, los métodos de procesamiento avanzados como la extracción de características, que en ocasiones pueden dar lugar a problemas, estos últimos requieren más tiempo de entrenamiento. Por otro lado, el aprendizaje profundo ofrece soluciones eficientes para que los modelos detecten muchos tipos de anomalías en los modelos informáticos que identifiquen varios tipos de anomalías en los sistemas informáticos. Esto ha llevado a la modernización de los sistemas de detección de intrusos, permitiendo a los algoritmos reconocer patrones y comportamientos novedosos. De esta manera, los algoritmos sirven para encontrar comportamientos inusuales y nuevos patrones en los datos. Esto plantea un dilema porque algunos sistemas son incapaces de detectarlos, ya que el número de amenazas informáticas aumenta cada día. Para llevar a cabo los incrementos o Sprints se empleó la metodología Scrum y se puso en marcha un enlace cliente-servidor. Para adquirir el tráfico de red en tiempo real. Después de aplicar técnicas de limpieza y preprocesamiento a la data, por consiguiente, se genera un modelo de red neuronal con el cual se evalúa por medio de métricas el desempeño en un ambiente controlado.