Thermalization of magnons in yttrium-iron garnet: nonequilibrium functional renormalization group approach

Using a nonequilibrium functional renormalization group (FRG) approach we calculate the time evolution of the momentum distribution of a magnon gas in contact with a thermal phonon bath. As a cutoff for the FRG procedure we use a hybridization parameter {\Lambda} giving rise to an artificial damping of the phonons. Within our truncation of the FRG flow equations the time evolution of the magnon distribution is obtained from a rate equation involving cutoff-dependent nonequilibrium self-energies, which in turn satisfy FRG flow equations depending on cutoff-dependent transition rates. Our approach goes beyond the Born collision approximation and takes the feedback of the magnons on the phonons into account. We use our method to calculate the thermalization of a quasi two-dimensional magnon gas in the magnetic insulator yttrium-iron garnet after a highly excited initial state has been generated by an external microwave field. We obtain good agreement with recent experiments.Comment: 16 pages, 6 figures, final versio

3-D reconstructions of the early-November 2004 CDAW geomagnetic storms: analysis of Ooty IPS speed and density data

Interplanetary scintillation (IPS) remote-sensing observations provide a view of the solar wind covering a wide range of heliographic latitudes and heliocentric distances from the Sun between ~0.1 AU and 3.0 AU. Such observations are used to study the development of solar coronal transients and the solar wind while propagating out through interplanetary space. They can also be used to measure the inner-heliospheric response to the passage of coronal mass ejections (CMEs) and co-rotating heliospheric structures. IPS observations can, in general, provide a speed estimate of the heliospheric material crossing the observing line of site; some radio antennas/arrays can also provide a radio scintillation level. We use a three-dimensional (3-D) reconstruction technique which obtains perspective views from outward-flowing solar wind and co-rotating structure as observed from Earth by iteratively fitting a kinematic solar wind model to these data. Using this 3-D modelling technique, we are able to reconstruct the velocity and density of CMEs as they travel through interplanetary space. For the time-dependent model used here with IPS data taken from the Ootacamund (Ooty) Radio Telescope (ORT) in India, the digital resolution of the tomography is 10° by 10° in both latitude and longitude with a half-day time cadence. Typically however, the resolutions range from 10° to 20° in latitude and longitude, with a half- to one-day time cadence for IPS data dependant upon how much data are used as input to the tomography. We compare reconstructed structures during early-November 2004 with in-situ measurements from the Wind spacecraft orbiting the Sun-Earth L<sub>1</sub>-Point to validate the 3-D tomographic reconstruction results and comment on how these improve upon prior reconstructions

Tax credits and in-work poverty in the UK: An analysis of income packages and anti-poverty performance

This paper examines the relationship between tax credits and in-work poverty, drawing on the findings from a major national study on in-work poverty. We present an analysis of (i) the income packages of working families and (ii) the performance of tax credits in relation to anti-poverty objectives, drawing on data from the Households Below Average Income survey between 2004/5 and 2014/15. Our study generates five novel findings, including that tax credits reduce the poverty gap of recipient households by two-thirds; that tax credit cuts post-2010/11 have served to focus payments on single parent families and households with greater numbers of children; and that tax credits make up just one third of the social security income of working households. We argue that understanding in greater depth the interaction between tax credits and income adequacy amongst working families is necessary to provide a firmer foundation for an effective assault on in-work poverty

Hick and Radhakrishnan on Religious Diversity: Back to the Kantian Noumenon

We shall examine some conceptual tensions in Hick’s ‘pluralism’ in the light of S. Radhakrishnan’s reformulation of classical Advaita. Hick himself often quoted Radhakrishnan’s translations from the Hindu scriptures in support of his own claims about divine ineffability, transformative experience and religious pluralism. However, while Hick developed these themes partly through an adaptation of Kantian epistemology, Radhakrishnan derived them ultimately from Śaṁkara (c.800 CE), and these two distinctive points of origin lead to somewhat different types of reconstruction of the diversity of world religions. Our argument will highlight the point that Radhakrishnan is not a ‘pluralist’ in terms of Hick’s understanding of the Real. The Advaitin ultimate, while it too like Hick’s Real cannot be encapsulated by human categories, is, however, not strongly ineffable, because some substantive descriptions, according to the Advaitic tradition, are more accurate than others. Our comparative analysis will reveal that they differ because they are located in two somewhat divergent metaphysical schemes. In turn, we will be able to revisit, through this dialogue between Hick and Radhakrishnan, the intensely vexed question of whether Hick’s version of pluralism is in fact a form of covert exclusivism.This is the author accepted manuscript. The final version is available from Springer via http://dx.doi.org/10.1007/s11841-015-0459-

The Problem of Prickling on Fabrics of South American Camelids Fibers: Possible Approaches for Mechanical Solutions

In this minireview it is to analyze the physical attributes that determine the comfort of fabrics made of South American Camelid fibers (Lama and Alpaca), discuss the effect on their textile value and evaluate an possible approache on their possible mechanical solutions. Taking the distribution of all fibers do not respond to a normal distribution, but the different fiber types identified by the type of medulla, they do respond to a normal distribution. While emphasis has always been on mean fiber diameter, the fiber frequency exceeding 30 microns (objectionable fibres) has a key role in quality. This is essential for light fabrics, where the effect of prickle plays a critical part in consumer´s choice. Dehairing, as a mechanical way, provides an immediate solution, though excessive fiber breakage should be addressed. It is concluded that the textile fiber quality of South American Camelids is promissory if the presence of objectionable fibers is solved, resulting in a tolerable frequency for consumers (<3%). This implies a true paradigm shift with regard to the classic textile processing of Alpaca and Lama fibers (from worsted to woolen system). This would enhance the fiber softness to touch, together with other important features that would render the fiber price more competitive

La vinculación tecnológica en el desarrollo de tecnología para el descerdado de fibras animales

Una innovación tecnológica se produce cuando se utiliza una tecnología nueva para introducir un cambio en un proceso desconocido o conocido pero desactualizado. Al respecto, la problemática de las fibras objetables, o sea fibras gruesas y rígidas que desvalorizan a las fibras especiales como: fibras de Camélidos (Alpaca-Llama, Vicuña-Guanaco), fibras caprinas (Cachemira-Mohair), que deben ser extraídas por el proceso de descerdado, fue el problema abordado. Descartado el descerdado a mano por ineficiente y laboralmente inadecuado, se centró en el desarrollo mecánico a partir de los principios conocidos: fuerza centrífuga y flotación. Los actores del proceso fueron: Fundación Habitat, programa SUPPRAD y un empresario emprendedor que solicitó el apoyo. La falta de conocimientos previos dificultó el inicio del proceso, se eligió el camino de la flotación y se llegó a un camino sin salida, luego se pasó a un diseño basado en la fuerza centrífuga pero innovando la movilidad de la fibra por corriente de aire a los fines de reducir las roturas de material y hacer más eficiente la extracción de las fibra objetables. El laboratorio de fibras animales fue fundamental para controlar y supervisar el proceso y la aparición temprana de la industria textil interesada en usar la materia prima descerdada también permitió avanzar rápidamente en la salida de la tecnología que tardó 4 años en tener sus primeros resultados y 1 año más en ponerla comercialmente activa. El objetivo de este trabajo es presentar la secuencia del desarrollo, dificultades y avances favorables, la interacción de los actores participantes y la situación actual del desarrollo. Se concluye, que el trabajo interdisciplinario (biología de la fibra, mecánica básica, mecánica textil, administración de empresas) permitió obtener resultados satisfactorios para la solución de un problema tecnológico (descerdado de fibras especiales) a través de la innovación y la vinculación interinstitucional

To Vax or Not to Vax: Predictors of Anti-Vax Attitudes and COVID-19 Vaccine Hesitancy Prior to Widespread Vaccine Availability

The novel coronavirus (COVID-19) is a highly contagious disease responsible for millions of deaths worldwide. Effective vaccines against COVID-19 are now available, however, an extreme form of vaccine hesitancy known as anti-vax attitudes challenge vaccine acceptance and distribution efforts. To understand these anti-vax attitudes and their associated psychological characteristics, we examined several predictors of vaccine hesitancy for COVID-19 and anti-vax attitudes generally. We surveyed 1004 adults (M = 47.0 years, SD = 17.1 years, range 18–98 years) in September-October 2020 across the United States (51% female, 49% male; 76.5% White, 23.5% non-White), prior to widespread availability of the COVID-19 vaccines. Attitudes toward vaccinations were influenced by a variety of factors, especially political attitudes. We should therefore anticipate and attempt to mitigate these challenges to achieving widespread vaccination to reduce the spread of COVID-19 and other communicable diseases