Quantcast
Channel: EL DISPENSADOR
Viewing all 68141 articles
Browse latest View live

¿Lo pintó Leonardo da Vinci o un ayudante? ‘Salvator Mundi’ pone en jaque el rigor del Louvre | Cultura | EL PAÍS

$
0
0
¿Lo pintó Leonardo da Vinci o un ayudante? ‘Salvator Mundi’ pone en jaque el rigor del Louvre | Cultura | EL PAÍS

¿Lo pintó Leonardo da Vinci o un ayudante? ‘Salvator Mundi’ pone en jaque el rigor del Louvre

Los expertos del museo francés no han facilitado todavía la atribución con la que tratarán el cuestionado cuadro en la gran exposición del próximo otoño

'Salvator Mundi', atribuido a Leonardo da Vinci. En vídeo, la polémica respecto a la autoría de la obra. 

Halma Angélico, la anarquista repudiada por la República | Cultura | EL PAÍS

$
0
0
Halma Angélico, la anarquista repudiada por la República | Cultura | EL PAÍS

Halma Angélico, la anarquista repudiada por la República

El CDN rescata la figura de esta escritora, única mujer que estrenó en el Teatro Español durante la guerra civil

Halma Angélico, en una imagen sin datar
Halma Angélico, en una imagen sin datar
Fueron sus propios compañeros anarquistas los que acabaron con ella. Halma Angélico, una escritora católica y militante de la CNT, una rotunda y temperamental feminista, fue tachada de contrarrevolucionaria por ensalzar, en plena guerra civil, los valores de la educación y el amor frente al horror de la batalla. Fue la única mujer que en plena Guerra Civil estrenó en el Teatro Español, en una ciudad asediada y bombardeada. Fue en agosto de 1938 con la obra Ak y la humanidad, un montaje basado en un cuento ruso en el que Angélico añadió el personaje de un fantasma que denunciaba lo absurdo de la guerra y el odio desatado –“hay que mejorar la humanidad, no destruirla”, decía-. Tenía entonces 50 años, estaba separada y era madre de dos hijos, uno de ellos en el frente. Fue acusada de provocar el desaliento en el frente y, a las dos semanas del estreno, tras una campaña de acoso febril por parte de la prensa y de responsables del sindicato anarquista, la función fue prohibida. “Si yo fuera un hombre no estaría en esa situación”, denunció Halma Angélico, seudónimo de María Francisca Clar Margarit, que envió una carta de renuncia como militante de CNT. Fue el final de esta creadora y ensayista incansable. Ya no volvió a escribir más. Encarcelada unos meses nada más acabar la guerra, murió en silencio y en la ruina catorce años más tarde.
El Centro Dramático Nacional recupera la figura de esta mujer con la obra Halma [En letra grande], escrita y dirigida por Yolanda García Serrano (Madrid, 1958) y protagonizada por Ana Villa y Enrique Asenjo. La sala El mirlo blanco, en el Teatro Valle Inclán, será testigo desde el 19 de febrero hasta el 3 de marzo, de la rabia y la desesperanza de una mujer, presidenta del Lyceum Club Femenino durante la República, incapaz de derribar el muro de odio que se alzó contra ella. “Los buitres acechan la destrucción de la humanidad”, denunció.
“Ha llegado la hora de hacer lo que ella no pudo”, se propuso Yolanda García Serrano, Premio Nacional de Literatura Dramática en 2018 por ¿Corre¡, fascinada por una mujer que nunca debió de caer en el olvido. No ha sido tarea fácil. La dramaturga, que apenas encontró un par de fotos de ella, ha pasado muchos meses en la Biblioteca Nacional empapándose de todas las obras escritas por Angélico, ensayos, novelas, artículos o teatro, e investigando en la prensa de la época. Ha descubierto a una mujer moderna, luchadora feminista, que defendía la maternidad sin padre y que abogaba por la enseñanza como la clave de la humanidad. “Sus artículos los podría escribir yo hoy mismo. Me sentí como una alma gemela. Pienso como pensaba ella. Me llamó mucho la atención el hecho de que nunca más volviera a escribir y de que decidiera quedarse en España a pesar de las ofertas que tuvo para exiliarse”, explica la dramaturga, que apenas encontró un par de fotos de ella.
La función teatral imagina, con datos reales, el encuentro, en un escenario poblado de libros, de Halma Angélico y el director y actor de Ak y la humanidad,Manuel González, en medio de la campaña de acoso que sufrió la autora. “Nunca la perdonaron que denunciara que el derramamiento de sangre no tenía justificación, que los dos años de guerra no conducían a nada”, lamenta García Serrano que guarda primorosa en el móvil una nueva imagen de Halma, que le ha enviado la bisnieta de la escritora, feliz y orgullosa cuando se enteró de que, por fin, su bisabuela iba a salir del injusto agujero de silencio.

Ian Gibson: “Machado está bien en Colliure. Si se llevan a la momia del Valle de los Caídos, quizás pueda volver” | Cultura | EL PAÍS

$
0
0
Ian Gibson: “Machado está bien en Colliure. Si se llevan a la momia del Valle de los Caídos, quizás pueda volver” | Cultura | EL PAÍS

Ian Gibson: “Machado está bien en Colliure. Si se llevan a la momia del Valle de los Caídos, quizás pueda volver”

El hispanista publica un libro sobre el poeta sevillano muerto en Colliure cuando se cumplen 80 años de su fallecimiento

Ian Gibson ante la tumba de Antonio Machado en Colliure.
Ian Gibson ante la tumba de Antonio Machado en Colliure. 

CARNAVAL | Poen de Wijs

$
0
0
La imagen puede contener: 2 personas

Poen de Wijs (Dutch artist) 1948 - 2014
Carnaval des Animaux, Lapin (Carnival of the Animals, Rabbit), 2013
acrylics on canvas
30 x 30 cm. (11.81 x 11.81 in.)
signed Poen de Wijs
private connection
© copyrighted work, shared with courtesy of Poen de Wijs

In 2011 Vincent Michels and Marley Eltz, acrobats, choreographers and artistic directors of the Amsterdam acrobat group Corpus Acrobatics, persuaded Poen to visit their show ‘Evolution’ in the Delamar theatre in Amsterdam. A breath-taking choreography that exposed the beauty and fragility of Mother Earth. The relationship in attitude between Vincent, Marley and Poen and their commonality within each other’s theme could not remain without consequences. Together with three contortionists (snake girls) of the group, Li Ling Kassing, Daniëlle Bubberman and Renske Endel, Poen realized a series of works based on the 14-part composition ‘Carnival des Animaux’ for ensemble or small orchestra in 1886, by French composer Camille Saint -Saëns. In music, he portrayed a number of animals and their characteristics, who are depicted a little mockingly, but also quite aptly.

CORPUS ACROBATICS from Amsterdam, founded and directed by Vincent Michels and Marley Eltz is a renowned acrobatic theatre company from Amsterdam, who perform for over 15 years spectacular acrobatic shows all over the world. Corpus is the first Dutch "new" circus without animals. The visual impact using projections, expression, sensational acrobatics and choreography give their performances a very personal style.
The group was extremely successful at many festivals and theatre tours, including Festival Classique , The Hague (2011), Delamar Theatre, Amsterdam (2011) and numerous international events including Mexico, Brazil, England, Spain, Switzerland, Germany, Belgium , France, Portugal and Russia.

Text from the catalogue ‘Carnaval des Animaux - 2013’

La imagen puede contener: 2 personas

JIRAFA | Poen de Wijs

$
0
0
Poen de Wijs

La imagen puede contener: 2 personas

Poen de Wijs (Dutch artist) 1948 - 2014
Bella en de Giraffe (Bella and the Giraffe), 1995
oil on panel
65 x 65 cm. (25.59 x 25.59 in.)
signed Poen de Wijs
private collection
© copyrighted work, shared with courtesy of Poen de Wijs

………And after culture, in recent years increasing room has been made for nature in Poen de Wijs' work, a development still in progress. Trips to Eastern Africa with its immense scenery and its unique tribes and scenic areas have contributed enormously. They profoundly appealed to Poen and intensified his sense of beauty and harmony.
Dreamlike images from the studio give way to images from the multiracial reality. Since the early Nineties Poen has intensively visited other countries that left memories which gradually fitted into his view of the world. At first still as an ode to youth and beauty (The Great Meeting, 1995).
Although here he neither doses his eyes nor his mind to the harsh reality of this continent, aesthetic images invariably appear on the canvas when hè allows himself to be inspired by Africa. Yet, there is a vast difference. Besides children and young models, in Poen's circle old African men, elephants with crackled skins, monks, lions.

Folded sheets and cloths enveloping the eternal youth of yesteryear are completed with the spent wrinkles of old age. But even in this transitoriness Poen chiefly sees beauty. For thus is his circle of life.

Text Gerard Kerkvliet, from “Poen de Wijs” – publlised by De Twee Pauwen – 1998


La imagen puede contener: 2 personas

Tadpole-Like Jets From Sun Add New Clue to Age-Old Mystery | NASA

$
0
0
Tadpole-Like Jets From Sun Add New Clue to Age-Old Mystery | NASA





Solar Tadpole-Like Jets 

Seen With NASA’S IRIS 

Add New Clue to Age-Old 

Mystery

Scientists have discovered tadpole-shaped jets coming out of regions with intense magnetic fields on the Sun. Unlike those living on Earth, these “tadpoles” — formally called pseudo-shocks — are made entirely of plasma, the electrically conducting material made of charged particles that account for an estimated 99 percent of the observable universe. The discovery adds a new clue to one of the longest-standing mysteries in astrophysics.
IRIS imagery of solar "tadpole" jet
Images from IRIS show the tadpole-shaped jets containing pseudo-shocks streaking out from the Sun.
Credits: Abhishek Srivastava IIT (BHU)/Joy Ng, NASA’s Goddard Space Flight Center
For 150 years scientists have been trying to figure out why the wispy upper atmosphere of the Sun — the corona — is over 200 times hotter than the solar surface. This region, which extends millions of miles, somehow becomes superheated and continually releases highly charged particles, which race across the solar system at supersonic speeds.
When those particles encounter Earth, they have the potential to harm satellites and astronauts, disrupt telecommunications, and even interfere with power grids during particularly strong events. Understanding how the corona gets so hot can ultimately help us understand the fundamental physics behind what drives these disruptions.
In recent years, scientists have largely debated two possible explanations for coronal heating: nanoflares and electromagnetic waves. The nanoflare theory proposes bomb-like explosions, which release energy into the solar atmosphere. Siblings to the larger solar flares, they are expected to occur when magnetic field lines explosively reconnect, releasing a surge of hot, charged particles. An alternative theory suggests a type of electromagnetic wave called Alfvén waves might push charged particles into the atmosphere like an ocean wave pushing a surfer. Scientists now think the corona may be heated by a combination of phenomenon like these, instead of a single one alone. 
The new discovery of pseudo-shocks adds another player to that debate. Particularly, it may contribute heat to the corona during specific times, namely when the Sun is active, such as during solar maximums — the most active part of the Sun’s 11-year cycle marked by an increase in sunspots, solar flares and coronal mass ejections.
The discovery of the solar tadpoles was somewhat fortuitous. When recently analyzing data from NASA’s Interface Region Imaging Spectrograph, or IRIS, scientists noticed unique elongated jets emerging from sunspots ­— cool, magnetically-active regions on the Sun’s surface — and rising 3,000 miles up into the inner corona. The jets, with bulky heads and rarefied tails, looked to the scientists like tadpoles swimming up through the Sun’s layers.
“We were looking for waves and plasma ejecta, but instead, we noticed these dynamical pseudo-shocks, like disconnected plasma jets, that are not like real shocks but highly energetic to fulfill Sun's radiative losses,” said Abhishek Srivastava, scientist at the Indian Institute of Technology (BHU) in Varanasi, India, and lead author on the new paper in Nature Astronomy.
Using computer simulations matching the events, they determined these pseudo-shocks could carry enough energy and plasma to heat the inner corona.
animation of computer simulation of pseudo-shock
A computer simulation shows how the pseudo-shock is ejected and becomes disconnected from the plasma below (green).
Credits: Abhishek Srivastava IIT (BHU)/Joy Ng, NASA’s Goddard Space Flight Center
The scientists believe the pseudo-shocks are ejected by magnetic reconnection — an explosive tangling of magnetic field lines, which often occurs in and around sunspots. The pseudo-shocks have only been observed around the rims of sunspots so far, but scientists expect they’ll be found in other highly magnetized regions as well.
solar imagery depicting tadpole-shaped pseudo-shocks
The tadpole-shaped pseudo-shocks, shown in dashed white box, are ejected from highly magnetized regions on the solar surface.
Credits: Abhishek Srivastava IIT (BHU)/Joy Ng, NASA’s Goddard Space Flight Center
Over the past five years, IRIS has kept an eye on the Sun in its 10,000-plus orbits around Earth. It’s one of several in NASA’s Sun-staring fleet that have continually observed the Sun over the past two decades. Together, they are working to resolve the debate over coronal heating and solve other mysteries the Sun keeps.
“From the beginning, the IRIS science investigation has focused on combining high-resolution observations of the solar atmosphere with numerical simulations that capture essential physical processes,” said Bart De Pontieu research scientist at Lockheed Martin Solar & Astrophysics Laboratory in Palo Alto, California. “This paper is a nice illustration of how such a coordinated approach can lead to new physical insights into what drives the dynamics of the solar atmosphere.”
The newest member in NASA’s heliophysics fleet, Parker Solar Probe, may be able to provide some additional clues to the coronal heating mystery. Launched in 2018, the spacecraft flies through the solar corona to trace how energy and heat move through the region and to explore what accelerates the solar wind as well as solar energetic particles. Looking at phenomena far above the region where pseudo-shocks are found, Parker Solar Probe’s investigation hopes to shed light on other heating mechanisms, like nanoflares and electromagnetic waves. This work will complement the research conducted with IRIS.
“This new heating mechanism could be compared to the investigations that Parker Solar Probe will be doing,” said Aleida Higginson, deputy project scientist for Parker Solar Probe at Johns Hopkins University Applied Physics Laboratory in Laurel, Maryland. “Together they could provide a comprehensive picture of coronal heating.”
Related Links
Last Updated: Feb. 19, 2019
Editor: Rob Garner

Citizen Scientist Finds Ancient White Dwarf Star With Puzzling Rings | NASA

$
0
0
Citizen Scientist Finds Ancient White Dwarf Star With Puzzling Rings | NASA



Citizen Scientist Finds 

Ancient White Dwarf Star 

Encircled by Puzzling Rings

A volunteer working with the NASA-led Backyard Worlds: Planet 9 project has found the oldest and coldest known white dwarf — an Earth-sized remnant of a Sun-like star that has died — ringed by dust and debris. Astronomers suspect this could be the first known white dwarf with multiple dust rings.
The star, LSPM J0207+3331 or J0207 for short, is forcing researchers to reconsider models of planetary systems and could help us learn about the distant future of our solar system.
“This white dwarf is so old that whatever process is feeding material into its rings must operate on billion-year timescales,” said John Debes, an astronomer at the Space Telescope Science Institute in Baltimore. “Most of the models scientists have created to explain rings around white dwarfs only work well up to around 100 million years, so this star is really challenging our assumptions of how planetary systems evolve.”
A paper detailing the findings, led by Debes, was published in the Feb. 19 issue of The Astrophysical Journal Letters and is now available online.
illustration of white dwarf LSPM J0207+3331
In this illustration, an asteroid (bottom left) breaks apart under the powerful gravity of LSPM J0207+3331, the oldest, coldest white dwarf known to be surrounded by a ring of dusty debris. Scientists think the system’s infrared signal is best explained by two distinct rings composed of dust supplied by crumbling asteroids.
Credits: NASA’s Goddard Space Flight Center/Scott Wiessinger
J0207 is located around 145 light-years away in the constellation Capricornus. White dwarfs slowly cool as they age, and Debes’ team calculated J0207 is about 3 billion years old based on a temperature just over 10,500 degrees Fahrenheit (5,800 degrees Celsius). A strong infrared signal picked up by NASA’s Wide-field Infrared Survey Explorer (WISE) mission — which mapped the entire sky in infrared light — suggested the presence of dust, making J0207 the oldest and coldest white dwarf with dust yet known. Previously, dust disks and rings had only been observed surrounding white dwarfs about one-third J0207’s age.
When a Sun-like star runs out of fuel, it swells into a red giant, ejects at least half of its mass, and leaves behind a very hot white dwarf. Over the course of the star’s giant phase, planets and asteroids close to the star become engulfed and incinerated. Planets and asteroids farther away survive, but move outward as their orbits expand. That’s because when the star loses mass, its gravitational influence on surrounding objects is greatly reduced.
This scenario describes the future of our solar system. Around 5 billion years from now, Mercury, then Venus and possibly Earth will be swallowed when the Sun grows into a red giant. Over hundreds of thousands to millions of years, the inner solar system will be scrubbed clean, and the remaining planets will drift outward.
Yet some white dwarfs — between 1 and 4 percent — show infrared emission indicating they’re surrounded by dusty disks or rings. Scientists think the dust may arise from distant asteroids and comets kicked closer to the star by gravitational interactions with displaced planets. As these small bodies approach the white dwarf, the star’s strong gravity tears them apart in a process called tidal disruption. The debris forms a ring of dust that will slowly spiral down onto the surface of the star.
series of WISE observations of ring-bearing white dwarf LSPM J0207+3331
Citizen scientists working on Backyard Worlds: Planet 9 scrutinize “flipbooks” of images from NASA’s Wide-field Infrared Survey Explorer. This animation shows a flipbook containing the ring-bearing white dwarf LSPM J0207+3331 (circled).
Credits: Backyard Worlds: Planet 9/NASA’s Goddard Space Flight Center
J0207 was found through Backyard Worlds: Planet 9, a project led by Marc Kuchner, a co-author and astrophysicist at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, that asks volunteers to sort through WISE data for new discoveries.
Melina Thévenot, a co-author and citizen scientist in Germany working with the project, initially thought the infrared signal was bad data. She was searching through the ESA’s (European Space Agency’s)Gaia archives for brown dwarfs, objects too large to be planets and too small to be stars, when she noticed J0207. When she looked at the source in the WISE infrared data, it was too bright and too far away to be a brown dwarf. Thévenot passed her findings along to the Backyard Worlds: Planet 9 team. Debes and Kuchner contacted collaborator Adam Burgasser at the University of California, San Diego to obtain follow-up observations with the Keck II telescope at the W. M. Keck Observatory in Hawaii.
“That is a really motivating aspect of the search,” said Thévenot, one of more than 150,000 citizen scientists on the Backyard Worlds project. “The researchers will move their telescopes to look at worlds you have discovered. What I especially enjoy, though, is the interaction with the awesome research team. Everyone is very kind, and they are always trying to make the best out of our discoveries.”
The Keck observations helped confirm J0207’s record-setting properties. Now scientists are left to puzzle how it fits into their models.
Debes compared the population of asteroid belt analogs in white dwarf systems to the grains of sand in an hourglass. Initially, there’s a steady stream of material. The planets fling asteroids inward towards the white dwarf to be torn apart, maintaining a dusty disk. But over time, the asteroid belts become depleted, just like grains of sand in the hourglass. Eventually, all the material in the disk falls down onto the surface of the white dwarf, so older white dwarfs like J0207 should be less likely to have disks or rings.
J0207’s ring may even be multiple rings. Debes and his colleagues suggest there could be two distinct components, one thin ring just at the point where the star’s tides break up the asteroids and a wider ring closer to the white dwarf. Follow-up with future missions like NASA's James Webb Space Telescope may help astronomers tease apart the ring’s constituent parts.
“We built Backyard Worlds: Planet 9 mostly to search for brown dwarfs and new planets in the solar system,” Kuchner said. “But working with citizen scientists always leads to surprises. They are voracious — the project just celebrated its second birthday, and they’ve already discovered more than 1,000 likely brown dwarfs. Now that we’ve rebooted the website with double the amount of WISE data, we’re looking forward to even more exciting discoveries.”  
Backyard Worlds: Planet 9 is a collaboration between NASA, the American Museum of Natural History in New York, Arizona State University, National Optical Astronomy Observatory, the Space Telescope Science Institute in Baltimore, the University of California San Diego, Bucknell University, the University of Oklahoma, and Zooniverse, a collaboration of scientists, software developers and educators who collectively develop and manage citizen science projects on the internet.
NASA's Jet Propulsion Laboratory in Pasadena, California, manages and operates WISE for NASA's Science Mission Directorate. The WISE mission was selected competitively under NASA's Explorers Program managed by the agency's Goddard Space Flight Center. The science instrument was built by the Space Dynamics Laboratory in Logan, Utah. The spacecraft was built by Ball Aerospace & Technologies Corp. in Boulder, Colorado. Placed in hibernation in 2011, the spacecraft was reactivated in 2013 and renamed NEOWISE. Science operations and data processing take place at the Infrared Processing and Analysis Center at Caltech, which manages JPL for NASA.
For more information about Backyard Worlds: Planet 9, visit: http://backyardworlds.org
For more information about NASA's WISE mission, visit: http://www.nasa.gov/wise
Last Updated: Feb. 19, 2019
Editor: Rob Garner

A-53 | Siggi Meissner's Art


COMPETENCIA | Siggi Meissner's Art

DIARIO DE MOTOCICLETA | Siggi Meissner's Art

DESPEGUE | Siggi Meissner's Art

CRUCE | Siggi Meissner's Art

56-INDIAN | Siggi Meissner's Art

COQUETA | Siggi Meissner's Art

SAQUEO | Siggi Meissner's Art


REFUGIO | Siggi Meissner's Art

VENTAJA | Siggi Meissner's Art

DISTANCIAS | Siggi Meissner's Art

DESPEDIDA | Siggi Meissner's Art

DE PASO | Siggi Meissner's Art

Viewing all 68141 articles
Browse latest View live


<script src="https://jsc.adskeeper.com/r/s/rssing.com.1596347.js" async> </script>