cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Effect of Hydroxyl Group of Catalyst on Formation of 2-Phenyl-Benzimidazole: A Theoretical Elucidation of Mechanism
Creators: name: Shahraki, Mehdi
name: Darijani, Mahdieh
name: Mahmoudi, Fatemeh
name: Gorgichi, Faezeh
Publisher: name: Taylor & Francis
Year: 2022
Subjects: subject: Biophysics
subject: Biochemistry
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Physiology
subject: FOS: Biological sciences
subject: Biotechnology
subject: Evolutionary Biology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 69999 Biological Sciences not elsewhere classified

description: In this work, the capability of step1 and step2 of the synthesis reaction mechanism of the 2-phenyl-1H-benzo[d]imidazole as a rate-determining step (RDS) has been energetically and thermodynamically evaluated using theoretical methods. The results were profoundly compared to the experimental approaches. The role of population explosion resulting from the increased hydroxyl groups within the catalyst structure was considered using some models with different hydroxyl groups on the reaction. Herein, the theoretical rate constants were obtained using the potential energy surfaces (PESs) and the transition state theory (TST) at the M06-2X/6-31 + G(d,p) level of theory. The calculated results showed that the second step (step2) is an RDS. In step2, H2O elimination can be proceeded by effective participation of catalyst for making a four-membered ring structure of TS that is generated harder than a six-membered ring mechanism (Ea = 56.3 and Ea = 29.7 kcal mol−1, respectively). Moreover, the reaction rate (for step2 as the RDS) in the presence of a modified catalyst (similar to sucrose containing five hydroxyl groups) speeds up 100,000 times more than the simple catalyst such as methanol (involving one hydroxyl group) and ethylene glycol (with the two hydroxyl groups). Theoretical calculations exhibited that the catalyst enables to facilitate a proton transfer process in step4 to make a great facility for doing oxidation process easily in step5 as the fastest step. In addition, when the reaction was followed without assisted-catalyst, herein, activation energy for step4 increased up to 34.8 kcal mol−1 while it was 10.8 kcal mol−1 in the presence of a catalyst.
Constraints on Chemically Mediated Coevolution: Multiple Functions for Seaweed Secondary Metabolites
Creators: name: Schmitt, T. M.
name: Lindquist, N.
name: Hay, M. E.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1995

description: Diterpene alcohols produced by the brown seaweed Dictyota menstrualis deter feeding by numerous species of abundant herbivores. Here we show that these same compound also may prevent fouling organisms from colonizing the surface of this alga. In the field, Dictyota menstrualis plants were less frequently and less heavily fouled than any of the other common seaweed species investigated. In laboratory assays, larvae of the common fouling bryozoan Bugula neritina failed to settle on Dictyota even though they contacted its surface as often as they contacted the surface of a preferred host alga. Rejection occurred only after direct contact with the alga's surface. Rejection of Dictyota was not mediated by water—borne chemical cues or by surface wettability (a physical property of the surface that can affect fouling). The lipid—soluble extract from surface rubbings of Dictyota inhibited larval settlement when placed on other surfaces and contained the diterpene alcohols pachydictyol A and dictyol E. Larvae exposed to these compounds experienced mortality, abnormal development, or reduced rates of development. Although the potential for chemically mediated coevolution between plants and herbivores has been the focus of scores of previous investigations, such coevolution will depend on selection altering the chemical defenses of the plant following the evolution of resistance by herbivores. Such a reciprocal response will be constrained if compounds play multiple roles that are ecologically important. Dictyota produces secondary metabolites that are broadly defensive against a wide variety of consumers and fouling organisms. Although certain consumers may evolve resistance to these metabolites, it is unclear that feeding by these consumers will result in reciprocal responses from the plant. We suggest that coevolved interactions may be uncommon, and that many interactions that appear to be coevolved may result from fortuitous and opportunistic preadaptations.
Figure S8 from Variably hungry caterpillars: predictive models and foliar chemistry suggest how to eat a rainforest.
Creators: name: Segar, Simon T.
name: Volf, Martin
name: Brus Isua
name: Mentap Sisol
name: Redmond, Conor M.
name: Rosati, Margaret E.
name: Gewa, Bradley
name: Molem, Kenneth
name: Dahl, Chris
name: Holloway, Jeremy D.
name: Basset, Yves
name: Miller, Scott E.
name: Weiblen, George
name: Juha-Pekka Salminen
name: Novotny, Vojtech
Publisher: name: The Royal Society
Year: 2017
Subjects: subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Ecology

description: A heatmap of geometrid abundance, oxidative activity (mg/g) and predicted occurrence derived from phylogenetic eigenvectors regression (PVR) including all significant phylogenetic axes. Geometrid abundance was not included as a model term in any PVR analysis.
Breaking discrete symmetries in the effective field theory of inflation
Creators: name: Cannone, Dario
name: Gong, Jinn-Ouk
name: Tasinato, Gianmassimo
Publisher: name: arXiv
Year: 2015
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We study the phenomenon of discrete symmetry breaking during the inflationary epoch, using a model-independent approach based on the effective field theory of inflation. We work in a context where both time reparameterization symmetry and spatial diffeomorphism invariance can be broken during inflation. We determine the leading derivative operators in the quadratic action for fluctuations that break parity and time-reversal. Within suitable approximations, we study their consequences for the dynamics of linearized fluctuations. Both in the scalar and tensor sectors, we show that such operators can lead to new direction-dependent phases for the modes involved. They do not affect the power spectra, but can have consequences for higher correlation functions. Moreover, a small quadrupole contribution to the sound speed can be generated.
description: (v1) 21 pages, 3 appendices; (v2) mistakes corrected in the analysis of tensor modes, presentation improved and references added
(2934) Horace Joseph Martin
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
Linking the central engine to the jet properties in radio loud AGN
Creators: name: Olguín-Iglesias, A.
name: León-Tavares, J.
name: Chavushyan, V.
name: Valtaoja, E.
name: Añorve, C.
name: Nilsson, K.
name: Kotilainen, J.
name: Tornikoski, M.
Publisher: name: arXiv
Year: 2015
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We explore the connection between the black hole mass and its relativistic jet for a sample of radio-loud AGN (z < 1), in which the relativistic jet parameters are well estimated by means of long term monitoring with the 14m Metsähovi millimeter wave telescope and the Very Long Base-line Array (VLBA). NIR host galaxy images taken with the NOTCam on the Nordic Optical Telescope (NOT) and retrieved from the 2MASS all-sky survey allowed us to perform a detailed surface brightness decomposition of the host galaxies in our sample and to estimate reliable black hole masses via their bulge luminosities. We present early results on the correlations between black hole mass and the relativistic jet parameters. Our preliminary results suggest that the more massive the black hole is, the faster and the more luminous jet it produces.
Kepler-102: Masses and Compositions for a Super-Earth and Sub-Neptune Orbiting an Active Star
Creators: name: Brinkman, Casey
name: Cadman, James
name: Weiss, Lauren
name: Gaidos, Eric
name: Rice, Ken
name: Huber, Daniel
name: Claytor, Zachary R.
name: Bonomo, Aldo S.
name: Buchhave, Lars A.
name: Cameron, Andrew Collier
name: Cosentino, Rosario
name: Dumusque, Xavier
name: Fiorenzano, Aldo F Martinez
name: Ghedina, Adriano
name: Harutyunyan, Avet
name: Howard, Andrew
name: Isaacson, Howard
name: Latham, David W.
name: Lopez-Morales, Mercedes
name: Malavolta, Luca
name: Micela, Giuseppina
name: Molinari, Emilio
name: Pepe, Francesco
name: Philips, David F
name: Poretti, Ennio
name: Sozzetti, Alessandro
name: Udry, Stephane
Publisher: name: arXiv
Year: 2022
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Radial velocity (RV) measurements of transiting multiplanet systems allow us to understand the densities and compositions of planets unlike those in the Solar System. Kepler-102, which consists of 5 tightly packed transiting planets, is a particularly interesting system since it includes a super-Earth (Kepler-102d) and a sub-Neptune-sized planet (Kepler-102e) for which masses can be measured using radial velocities. Previous work found a high density for Kepler-102d, suggesting a composition similar to that of Mercury, while Kepler-102e was found to have a density typical of sub-Neptune size planets; however, Kepler-102 is an active star, which can interfere with RV mass measurements. To better measure the mass of these two planets, we obtained 111 new RVs using Keck/HIRES and TNG/HARPS-N and modeled Kepler-102's activity using quasi-periodic Gaussian Process Regression. For Kepler-102d, we report a mass upper limit of M$_{d} < $5.3 M$_{\oplus}$ [95\% confidence], a best-fit mass of M$_{d}$=2.5 $\pm$ 1.4 M$_{\oplus}$, and a density of $ρ_{d}$=5.6 $\pm$ 3.2 g/cm$^{3}$ which is consistent with a rocky composition similar in density to the Earth. For Kepler-102e we report a mass of M$_{e}$=4.7 $\pm$ 1.7 M$_{\oplus}$ and a density of $ρ_{e}$=1.8 $\pm$ 0.7 g/cm$^{3}$. These measurements suggest that Kepler-102e has a rocky core with a thick gaseous envelope comprising 2-4% of the planet mass and 16-50% of its radius. Our study is yet another demonstration that accounting for stellar activity in stars with clear rotation signals can yield more accurate planet masses, enabling a more realistic interpretation of planet interiors.
description: Accepted to AJ 11/08/2022
Analytical Form of Forces in Hydrophobic Collapse
Creators: name: Chakrabarti, J.
name: Dutta, Suman
Publisher: name: arXiv
Year: 2015
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We calculate analytically the forces between two solvophobic solutes, considering a model system. We show that the effective interaction forces between two solvophobic solutes, mediated by the solvent, is attractive for short ranges, which decreases linearly with surface-to-surface separation s between the solutes and repulsive in the long range falling off as 1 / s 4 . The attraction originates from the unbalanced Laplace force at the liquid-gas interface, generated by the repulsive interaction with the solvent particles, around the solutes at small s. The long range part arises due to unbalanced osmotic pressure. We illustrate the calculations for the Lennard-Jones solvent. We discuss the general implication of our results in the context of hydrophobic collapse.
[PDF/Kindle] Al Unser Jr: A Checkered Past by Al Unser Jr, Jade Gurss, Roger Penske
Creators: name: Diggs
Publisher: name: Zenodo
Year: 2024

description: Al Unser Jr: A Checkered Past by Al Unser Jr, Jade Gurss, Roger Penske

 

 

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Al Unser Jr: A Checkered Past

Al Unser Jr, Jade Gurss, Roger Penske

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ISBN: 9781642340457

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Alternative approach to the Starobinsky model for inflation scenarios
Creators: name: Chaichian, Masud
name: Ghal'e, Amir
name: Oksanen, Markku
Publisher: name: arXiv
Year: 2022
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: The $R+R^2$ model of gravity with the corresponding shallow potential in the Einstein frame is consistent with the observations. Recently, many efforts have been made to generalize the $R+R^2$ (Starobinsky) model of inflation or use other shallow potentials to construct a model for the early Universe. We revise the question about the shallow potential. We propose a model in which the Starobinsky model can emerge through a dynamical mechanism. We show that the absence of ghost modes results to constraints on the parameters of the Starobinsky model. We obtain the scalar spectral index and the tensor-to-scalar ratio of the extended model and study the three-point correlation function of the curvature perturbation to estimate the primordial non-Gaussianities of the proposed model.
description: 24 pages, 4 figures. v4: corrections to language and references; added affiliation; to appear in Phys. Rev. D. arXiv admin note: substantial text overlap with arXiv:2012.10889
(2936) Walter Waddelow Martin
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
Hole doping in compositionally complex correlated oxide enables tunable exchange biasing
Creators: name: Mazza, Alessandro R.
name: Skoropata, Elizabeth
name: Lapano, Jason
name: Chilcote, Michael A.
name: Jorgensen, Cameron
name: Tang, Nan
name: Gai, Zheng
name: Singleton, John
name: Brahlek, Matthew J.
name: Gilbert, Dustin A.
name: Ward, Thomas Z.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Strongly Correlated Electrons (cond-mat.str-el)
subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Magnetic interfaces and the phenomena arising from them drive both the design of modern spintronics and fundamental research. Recently, it was revealed that through designing magnetic frustration in configurationally complex entropy stabilized oxides, exchange bias can occur in structurally single crystal films. This eliminates the need for complex heterostructures and nanocomposites in the design and control of magnetic response phenomena. In this work, we demonstrate through hole doping of a high entropy perovskite oxide that tuning of magnetic responses can be achieved. With detailed magnetometry, we show magnetic coupling exhibiting a variety of magnetic responses including exchange bias and antiferromagnetic spin reversal in the entropy stabilized ABO3 perovskite oxide La1-xSrx(Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O3 family. We find that manipulation of the A-site charge state can be used to balance magnetic phase compositions and coupling responses. This allows for the creation of highly tunable exchange bias responses. In the low Sr doping regime, a spin frustrated region arising at the antiferromagnetic phase boundary is shown to directly couple to the antiferromagnetic moments of the film and emerges as the dominant mechanism, leading to a vertical shift of magnetization loops in response to field biasing. At higher concentrations, direct coupling of antiferromagnetic and ferromagnetic regions is observed. This tunability of magnetic coupling is discussed within the context of these three competing magnetic phases, revealing critical features in designing exchange bias through exploiting spin frustration and disorder in high entropy oxides.
CÓMO EDUCAR PERSONAS DE ÉXITO ESTHER WOJCICKI ePub gratis
Creators: name: Crowder
Publisher: name: Zenodo
Year: 2024

description: CÓMO EDUCAR PERSONAS DE ÉXITO de ESTHER WOJCICKI

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CÓMO EDUCAR PERSONAS DE ÉXITO

ESTHER WOJCICKI

Número de páginas: 360

Idioma: CASTELLANO

Formatos: Pdf, ePub, MOBI, FB2

ISBN: 9788425357770

Editorial: GRIJALBO

Año de edición: 2019

 

 

 

 

 

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Cambia tu forma de educar, cambia el mundo.

La abuela deSilicon Valley, una profesora legendaria y madre de tres exitosas hijas, comparte sus probados y contrastados métodos para criar niños felices, sanos y exitosos.

No hay una forma perfecta de educar, pero los pilares del método de EstherWojcicki, pueden serte de gran ayuda:

Confianza

Respeto

Independencia

Colaboración

Amabilidad

Como maestra, Esther Wojcicki ha sido lo suficientemente valiente para desafiar la enseñanza convencional convirtiendo a los alumnos en participantes activos de su propio aprendizaje. Como madre, entendió y supo cómo fomentar la responsabilidad, la autosuficiencia y la creatividad en sus hijas. Esta combinación de sabiduría práctica e inspiración es un recurso valiosísimo que puede resultar muy útil para quienes hoy en día se encargan de la educación de niños y jóvenes.

Educar en la era digital supone todo un reto, pero estas páginas nos muestran que la crianza moderna puede ser motivo de alegría en lugar de una lucha constante. La comprensión innata de Wojcicki del desarrollo infantil la ha llevado a convertirse en una de las profesoras más alabadas del mundo, además de madre de tres hijas de gran éxito: una es CEO de Youtube; otra, fundadora y CEO de 23andMe; y la otra, científica.

Esta gran profesora está liderando una revolución en todo el mundo no solo en la forma en que prepara a sus alumnos, sino también en cómo fomenta su salud y el bienestar de sus padres. Steve Jobs sacó a sus hijos de la escuela privada y los llevó al instituto público de Palo Alto para que tuvieran la oportunidad de estudiar con ella. Cuando Jobs fue despedido de Apple, se sentó en el aula de Wojcicki y le pidió consejo.

Wojcicki nos obsequia con su única y científicamente contrastada metodología y ofrece a los padres la guía clara y visionaria que están esperando: un manifiesto que cambia radicalmente el paradigma sobre la educación en la era digital.

Reseña:«Esta mujer está liderando una revolución: nos muestra cómo ser lo mejor posible para que nuestros hijos también puedan serlo.»Arianna Huffington, fundadora del Huffington Post
Appendix 1 from Varyingly hungry caterpillars: predictive models and foliar chemistry suggest how to eat a rainforest
Creators: name: Segar, Simon T.
name: Volf, Martin
name: Brus Isua
name: Mentap Sisol
name: Redmond, Conor M.
name: Rosati, Margaret E.
name: Gewa, Bradley
name: Molem, Kenneth
name: Dahl, Chris
name: Holloway, Jeremy D.
name: Basset, Yves
name: Miller, Scott E.
name: Weiblen, George
name: Juha-Pekka Salminen
name: Novotny, Vojtech
Publisher: name: The Royal Society
Year: 2017
Subjects: subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Ecology

description: Detailed methods and results section.
Supplementary Material Figure Legends from Varyingly hungry caterpillars: predictive models and foliar chemistry suggest how to eat a rainforest
Creators: name: Segar, Simon T.
name: Volf, Martin
name: Brus Isua
name: Mentap Sisol
name: Redmond, Conor M.
name: Rosati, Margaret E.
name: Gewa, Bradley
name: Molem, Kenneth
name: Dahl, Chris
name: Holloway, Jeremy D.
name: Basset, Yves
name: Miller, Scott E.
name: Weiblen, George
name: Juha-Pekka Salminen
name: Novotny, Vojtech
Publisher: name: The Royal Society
Year: 2017
Subjects: subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Ecology

description: A long-term goal in evolutionary ecology is to explain the incredible diversity of insect herbivores and patterns of plant host use in speciose groups like tropical Lepidoptera. Here, we used standardized food-web data, multigene phylogenies of both trophic levels and plant chemistry data to model interactions between Lepidoptera larvae (caterpillars) from two lineages (Geometridae and Pyraloidea) and plants in a species-rich lowland rainforest in New Guinea. Model parameters were used to make and test blind predictions for two hectares of an exhaustively sampled forest. For pyraloids, we relied on phylogeny alone and predicted 54% of species-level interactions, translating to 79% of all trophic links for individual insects, by sampling insects from only 15% of local woody plant diversity. The phylogenetic distribution of host-plant associations in polyphagous geometrids was less conserved, reducing accuracy. In a truly quantitative food web, only 40% of pair-wise interactions were described correctly in geometrids. Polyphenol oxidative activity (but not protein precipitation capacity) was important for understanding the occurrence of geometrids (but not pyraloids) across their hosts. When both foliar chemistry and plant phylogeny were included, we predicted geometrid–plant occurrence with 89% concordance. Such models help to test macroevolutionary hypotheses at the community level.
Susceptibility to Herbivores Depends on Recent History of both the Plant and Animal
Creators: name: Cronin, Greg
name: Hay, Mark E.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 1996

description: Physical stress to seaweeds and hunger stress of herbivores can influence the outcome of chemically mediated seaweed-herbivore interactions. The unpalatable brown seaweed Dictyota ciliolata produces the diterpenoid secondary metabolites pachydictyol A, dictyol B acetate, and dictyodial. At natural concentrations, pachydictyol A deterred the sea urchin Arbacia punctulata but did not inhibit feeding by the pinfish Lagodon rhomboides or the amphipod Ampithoe longimana until concentrations were 2.5-5 times natural levels. Dictyol B acetate deterred the urchin, amphipod, and pinfish at, or far below, natural concentrations. Dictyodial was too unstable to assay directly, but indirect experiments suggested that natural concentrations deterred the urchin, but not the pinfish or amphipod. Mild desiccation of D. ciliolata reduced concentrations of the different secondary metabolites by 7-38% and plants became 2.6-3.4 times more susceptible to urchin and amphipod grazing. The combined concentrations of pachydictyol A and dictyol B acetate found in undesiccated Dictyota ciliolata deterred feeding by urchins, but this deterrent effect was lost at concentrations found in the desiccated plants. Desiccated and undesiccated plants did not differ in nutritive value (as measured by protein and total N content) or toughness. Thus, desiccated plants became more palatable because chemical defenses were lost, not because nutritive value was increased. The stress of near-surface ultraviolet radiation also caused significant physiological changes in Dictyota ciliolata. UV-exposed blades bleached, senesced, and grew 84% less than blades protected from UV radiation. Tissue loss and minimal growth of UV-stressed plants constrained our sample sizes, but the limited assays that could be run suggested that UV stress may lower chemical defenses and increase plant susceptibility to herbivores. Because many previous investigations of herbivore feeding patterns used animals that had been starved for days before an assay, we tested the effects of this commonly used procedure on feeding discrimination. Recently fed urchins always avoided food containing natural concentrations of pachydictyol A during separate feeding trials performed on each of four consecutive days. In contrast, urchins deprived of food for 3 d before this assay did not avoid the treated food on days 1 and 2 of feeding trials, but did avoid it on days 3 and 4 after their hunger was reduced by feeding during days 1 and 2. If we had used only starved urchins (a common procedure in previous investigations), we could have concluded, with apparent justification, that urchins were unaffected by pachydictyol A (if the assays were run for only 1-2 d) or that they needed 2 d of exposure to the compound in order to learn to avoid it. Both of these conclusions would have been incorrect.
ملاحظات انتقادی و اخلاقی برای بهبود استفاده از شاخص های ارزیابی پژوهش/ Ethical & Critical Considerations to Improve Usage of Research Assessment Metrics
Creators: name: Hosseini, Elaheh
Publisher: name: Zenodo
Year: 2022
Subjects: Responsible metrics, Altmetrics, DORA, Metric Tide, The Leiden Manifesto for research metrics, Metric literacy

description: ارائه با عنوان «ملاحظات انتقادی و اخلاقی برای بهبود استفاده از شاخص های ارزیابی پژوهش» در نشست تخصصی با عنوان ارزیابی و علم سنجی پژوهش های علوم انسانی: رویکردی انتقادی به مبانی و روش ها که در مؤسسه مطالعات فرهنگی و اجتماعی وزارت علوم، تحقیقات و فناوری مورخ 15 شهریور 1400 برگزار شد.
MHD wave propagation from the sub-photosphere to the corona in an arcade-shaped magnetic field with a null point
Creators: name: Santamaria, Irantzu C.
name: Khomenko, Elena
name: Collados, Manuel
Publisher: name: arXiv
Year: 2015
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The aim of this work is to study the energy transport by means of MHD waves propagating in quiet Sun magnetic topology from layers below the surface to the corona. Upward propagating waves find obstacles, such as the equipartition layer with plasma b=1 and the transition region, and get converted, reflected and refracted. Understanding the mechanisms by which MHD waves can reach the corona can give us information about the solar atmosphere and the magnetic structures. We carry out two-dimensional numerical simulations of wave propagation in a magnetic field structure that consists of two vertical flux tubes separated by an arcade shaped magnetic field. This configuration contains a null point in the corona, that significantly modifies the behaviour of the waves. We describe in detail the wave propagation through the atmosphere under different driving conditions. We also present the spatial distribution of the mean acoustic and magnetic energy fluxes and the spatial distribution of the dominant frequencies in the whole domain. We conclude that the energy reaches the corona preferably along vertical magnetic fields, inside the flux tubes, and it has an acoustic nature. Most of the magnetic energy keeps concentrated below the transition region due to the refraction of the magnetic waves and the continuous conversion of acoustic-like waves into fast magnetic waves in the equipartition layer located in the photosphere. However, part of the magnetic energy reaches the low corona when propagating in the region where the arcades are located, but waves are sent back downwards to the lower atmosphere at the null point surroundings. This phenomenon, together with the reflection and refraction of waves in the TR and the lower turning point, act as a re-feeding of the atmosphere. In the frequency distribution, we find that high frequency waves can reach the corona outside the vertical flux tubes.
description: 13 pages, 13 figures
(2931) John Gambling
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
Evidence of photo-induced dynamic competition of metallic and insulating phase in a layered manganite
Creators: name: Li, Yuelin
name: Walko, Donald A.
name: Li, Qingan
name: Liu, Yaohua
name: Rosenkranz, Stephan
name: Zheng, Hong
name: Mitchell, J. F
Publisher: name: arXiv
Year: 2015
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We show evidence that the competition between the antiferromagetic metallic phase and the charge- and orbital-ordered insulating phase at the reentrant phase boundary of a layered manganite, LaSr2Mn2O7, can be manipulated using ultrafast optical excitation. The time-dependent evolution of the Jahn-Teller superlattice reflection, which indicates the formation of the charge and orbital order, was measured at different laser fluences. The laser-induced enhancement and reduction the Jahn-Teller reflection intensity shows a reversal of sign between earlier (~10 ns) and later (~150 ns) time delays during the relaxation after photo excitation. This effect is consistent with a scenario whereby the laser excitation modulates the local competition between the metallic and the insulating phases.
description: Main text has 18 pages, 5 figure; supplemental material has 3 pages
HABITAT COMPLEXITY DISRUPTS PREDATOR–PREY INTERACTIONS BUT NOT THE TROPHIC CASCADE ON OYSTER REEFS
Creators: name: Grabowski, Jonathan H.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2004

description: Despite recognition of the significance of both food web interactions and habitat complexity in community dynamics, current ecological theory rarely couples these two processes. Experimental manipulations of the abundance of the two predators in an oyster-reef trophic cascade, and the structural complexity provided by reefs of living oysters, demonstrated that enhanced habitat complexity weakened the strengths of trophic interactions. The system of tri-trophic interactions included oyster toadfish (Opsanus tau) as the top predator that consumed the mud crab (Panopeus herbstii), which preys upon juvenile oysters (Crassostrea virginica). On reefs of low complexity, toadfish controlled mud crab abundances and indirectly determined the level of mortality of juvenile oysters. The indirect effects of toadfish on oysters emerged through their influence on how intensely mud crabs preyed on oysters. Augmentation of habitat complexity by substituting vertically oriented, living oysters for the flat shells of dead oysters disrupted both of the direct trophic linkages but did not alter the magnitude of the indirect effect of toadfish on juvenile oysters. This paradox can be understood by partitioning the mechanisms by which toadfish influence mud crabs and ultimately juvenile oysters. Trait-mediated indirect interactions (TMIIs; i.e., predator-avoidance behavior in mud crabs) accounted for 95.6-98.2% of toadfish indirect benefits to oyster survival and, consequently, were a much greater contributor than density-mediated indirect interactions (DMIIs; i.e., the reduction in crab abundance by toadfish). Avoidance behavior was unaffected by modification in habitat complexity. Complex reefs increased total oyster survival because added habitat complexity reduced mud crab predation on oysters. Additionally, the magnitude of this effect was much greater than the increase in oyster mortality as a result of complex reefs disrupting toadfish predation on mud crabs. This experimental demonstration of how habitat complexity modifies trophic interactions in a temperate reef community has fundamental implications for our understanding of species interaction webs and community structure. The influence of habitat complexity on the strength of a trophic cascade generally may depend upon whether physical complexity provides actual and perceived refuges for component predator-prey pairs.
(2932) Maria [Gambling]
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
[Descargar pdf] PETER PAN
Creators: name: Perry
Publisher: name: Zenodo
Year: 2024

description: PETER PAN de JAMES MATTHEW BARRIE

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PETER PAN

JAMES MATTHEW BARRIE

Número de páginas: 65

Idioma: INGLÉS

Formatos: Pdf, ePub, MOBI, FB2

ISBN: 9788468222608

Editorial: VICENS-VIVES

Año de edición: 2014

 

 

 

 

 

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PDF [Download] Love Contract by Sophie Lark
Creators: name: Ratliff
Publisher: name: Zenodo
Year: 2024

description: Love Contract by Sophie Lark

 

 

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Love Contract

Sophie Lark

Page: 350

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ISBN: 9781958931110

Publisher: Lark Publishing LLC

 

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Covariant color-kinematics duality, Hopf algebras and permutohedra
Creators: name: Cao, Qu
name: Dong, Jin
name: He, Song
name: Zhang, Yao-Qi
Publisher: name: arXiv
Year: 2022
Subjects: subject: High Energy Physics - Theory (hep-th)
subject: FOS: Physical sciences

description: Based on the covariant color-kinematics duality, we investigate combinatorial and algebraic structures underlying their Bern-Carrasco-Johansson (BCJ) numerators of tree-level amplitudes in Yang-Mills-scalar (YMS) theory. The closed-formulae for BCJ numerators of YMS amplitudes and the pure-Yang-Mills (YM) ones exhibit nice quasi-shuffle Hopf algebra structures, and interestingly they can be viewed as summing over boundaries of all dimensions of a combinatorial permutohedron. In particular, the numerator with two scalars and $n{-}2$ gluons contains Fubini number ( $F_{n{-}2}$ ) of terms in one-to-one correspondence with boundaries of a $(n{-}3)$-dimensional permutohedron, and each of them has its own spurious-pole structures and a gauge-invariant numerator (both depending on reference momenta). From such Hopf algebra or permutohedron structure, we derive new recursion relations for the numerators and intriguing "factorization" on each spurious pole/facet of the permutohedron. Similar results hold for general YMS numerators and the pure-YM ones. Finally, with a special choice of reference momenta, our results imply BCJ numerators in a heavy-mass effective field theory with two massive particles and $n{-}2$ gluons/gravitons: we observe highly nontrivial cancellations in the heavy-mass limit, leading to new formulae for the effective numerators which resemble those obtained in recent works.
description: 8 pages+appendices, 16 figures
Heatmap of geometrid host use across the host phylogeny from Varyingly hungry caterpillars: predictive models and foliar chemistry suggest how to eat a rainforest
Creators: name: Segar, Simon T.
name: Volf, Martin
name: Brus Isua
name: Mentap Sisol
name: Redmond, Conor M.
name: Rosati, Margaret E.
name: Gewa, Bradley
name: Molem, Kenneth
name: Dahl, Chris
name: Holloway, Jeremy D.
name: Basset, Yves
name: Miller, Scott E.
name: Weiblen, George
name: Juha-Pekka Salminen
name: Novotny, Vojtech
Publisher: name: The Royal Society
Year: 2017
Subjects: subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Ecology

description: A heatmap of geometrid abundance, oxidative activity (mg/g) and predicted occurrence.
Detection of single-degenerate massive binaries with Gaia: The impact of blue supergiants, triples, mass precision, and high-precision parallax requirements
Creators: name: Janssens, S.
name: Shenar, T.
name: Sana, H.
name: Marchant, P.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: Astrophysics of Galaxies (astro-ph.GA)
subject: FOS: Physical sciences

description: Hundreds of black holes with massive main-sequence companions (OB+BHs) might be identified from Gaia astrometry with the Astrometric Mass-Ratio Function (AMRF). We investigate the impact of blue supergiant companions (BSG) instead of dwarfs and the presence of additional companions in the system that are unresolved by Gaia on the astrometric identification of OB+BHs. We also explore how accurate the primary mass needs to be constrained. Moreover, we assess how the high-precision publishing constraints of astrometric binary orbits in the latest Gaia data release DR3 impact the detection of OB+BHs. We establish a BSG mass-magnitude relation and compute BSG AMRF curves. From a mock population of non- and single-degenerate massive binaries and triples with OB or BSG primaries, we asses the false-positive identification fraction and the effect of the BSG AMRF curves. We compare the number of stars with astrometric DR3 orbits in the second Alma Luminous Star catalogue (ALSII) with new predictions on the OB+BH detection using the conservative DR3 publishing criteria. BSG primaries and triples are not expected to impact the false-positive identification fractions significantly. However, if the evolutionary stage of the primary star is unknown, the usage of the BSG curves is still recommended. This also reduces the OB+BH identification fraction significantly. The primary mass does not need to be known to benefit from the high identification fraction of OB+BHs, while keeping the fraction of false-positives low. We find no OB+BH candidates in the ALS II among the DR3 orbits. This null-detection cannot be attributed to the underlying BH-formation scenario, but rather to the stringent DR3 selection criteria. To infer the BH-formation scenario with Gaia, we propose that the constraint on the relative parallax precision in DR4 should be 95% less conservative than the DR3 criterion.(Abridged)
description: 15 pages (+ 5 appendix), 10 figures, 3 tables, submitted to A&A
Supplementary Information 1 from Indirectly connected: simple social differences can explain the causes and apparent consequences of complex social network positions.
Creators: name: Firth, Josh A.
name: Sheldon, Ben C.
name: Brent, Lauren J. N.
Publisher: name: The Royal Society
Year: 2017
Subjects: subject: Evolutionary Biology
subject: FOS: Biological sciences
subject: Ecology
subject: 60801 Animal Behaviour

description: Supplementary methods and figures
MAMBO image of the debris disk around epsilon Eridani : robustness of the azimuthal structure
Creators: name: Lestrade, Jean-Francois
name: Thilliez, Elodie
Publisher: name: arXiv
Year: 2015
Subjects: subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: The debris disk closest to Earth is the one around the star epsilon Eridani at a distance of 3.2 pc. It is the prime target for detailed studies of a belt of planetesimals left from the early phase of planet formation other than the Kuiper Belt. The non-uniform ring-like structure around epsilon Eridani, originally discovered at lambda=850 microns with the bolometer camera SCUBA, could be the signpost of unseen long-period planets interior to the disk that gravitationally interact with it through mean-motion resonances. However, the reliability of the structure at 850 microns, which has been debated, has not been verified with independent observations until now. We present a high signal-to-noise ratio image of this structure at lambda=1.2 mm made with the bolometer camera MAMBO and compare this with the SCUBA image. We have found that three of the four emission clumps (NE, NW, SW) and the two deep hollows to the east and west are at the same positions in the MAMBO and SCUBA images within astrometric uncertainty. The SE clump is at odds, significantly brighter and more extended in the SCUBA than in the MAMBO images, but it is possible that this mismatch is an artifact. We conclude that this degree of positional coincidence provides tentative evidence that the observed structure is robust. In addition, we present the radial brightness profile of our MAMBO image and show that the width of the planetesimal belt around epsilon Eridani is narrower than 22 AU, a more stringent upper limit than determined from previous observations. The corresponding relative width is $0.1 < ΔR / R < 0.4$, which is lower than for the Kuiper Belt.
description: Accepted for publication in Astronomy and Astrophysics