Spontaneous Magnetization in Heterometallic NiFe-MOF-74 Microporous Magnets by Controlled Iron Doping

We report the direct synthesis of mixed-metal NiFe-MOF-74 solids that display combination of porosity with ferrimagnetic ordering. Compared to the undoped Ni phase, controlled doping with Fe enables to modify intra and interchain magnetic interactions for the onset of spontaneous magnetization at temperatures fixed by the doping level. Synthesis of porous magnets remains somewhat elusive due to the difficulties in isolating foreseeable metal-organic architectures that combine small bridging linkers, for strong magnetic coupling, with polyaromatic connectors responsible for porosity. In turn, we demonstrate that metal doping is better fitted to modify the magnetism of Metal-Organic Frameworks already available simply by suitable choice of their nature and relative ratio in isostructural solid solutions

Direct Visualization of Mechanical Beats by Means of an Oscillating Smartphone

[EN] The resonance phenomenon is widely known in physics courses.1 Qualitatively speaking, resonance takes place in a driven oscillating system whenever the frequency approaches the natural frequency, resulting in maximal oscillatory amplitude. Very closely related to resonance is the phenomenon of mechanical beating, which occurs when the driving and natural frequencies of the system are slightly different. The frequency of the beat is just the difference of the natural and driving frequencies. Beats are very familiar in acoustic systems. There are several works in this journal on visualizing the beats in acoustic systems.2¿4 For instance, the microphone and the speaker of two mobile devices were used in previous work2 to analyze the acoustic beats produced by two signals of close frequencies. The formation of beats can also be visualized in mechanical systems, such as a mass-spring system5 or a double-driven string.6 Here, the mechanical beats in a smartphone-spring system are directly visualized in a simple way. The frequency of the beats is measured by means of the acceleration sensor of a smartphone, which hangs from a spring attached to a mechanical driver. This laboratory experiment is suitable for both high school and first-year university physics courses.The authors would like to thank the Institute of Educational Sciences of the Universitat Politecnica de Valencia (Spain) for the support of the Teaching Innovation Groups MoMa and e-MACAFI and for the financial support through the Project PIME 2015 B18.Giménez Valentín, MH.; Salinas Marín, I.; Monsoriu Serra, JA.; Castro-Palacio, JC. (2017). Direct Visualization of Mechanical Beats by Means of an Oscillating Smartphone. The Physics Teacher. 55(7):424-425. https://doi.org/10.1119/1.5003745S42442555

Regulation of Human Separase by Securin Binding and Autocleavage

AbstractBackground: Sister chromatid separation is initiated by separase, a protease that cleaves cohesin and thereby dissolves sister chromatid cohesion. Separase is activated by the degradation of its inhibitor securin and by the removal of inhibitory phosphates. In human cells, separase activation also coincides with the cleavage of separase, but it is not known if this reaction activates separase, which protease cleaves separase, and how separase cleavage is regulated.Results: Inhibition of separase expression in human cells by RNA interference causes the formation of polyploid cells with large lobed nuclei. In mitosis, many of these cells contain abnormal chromosome plates with unseparated sister chromatids. Inhibitor binding experiments in vitro reveal that securin prevents the access of substrate analogs to the active site of separase. Upon securin degradation, the active site of full-length separase becomes accessible, allowing rapid autocatalytic cleavage of separase at one of three sites. The resulting N- and C-terminal fragments remain associated and can be reinhibited by securin. A noncleavable separase mutant retains its ability to cleave cohesin in vitro.Conclusions: Our results suggest that separase is required for sister chromatid separation during mitosis in human cells. Our data further indicate that securin inhibits separase by blocking the access of substrates to the active site of separase. Securin proteolysis allows autocatalytic processing of separase into a cleaved form, but separase cleavage is not essential for separase activation

Túnel de Viento para el Estudio de la Erosión Eólica

Número de publicación: ES2453815 A1 (08.04.2014) También publicado como: ES2453815 B1 (20.01.2015) Número de Solicitud: Consulta de Expedientes OEPM (C.E.O.) P201201028 (08.10.2012)Túnel de viento para el estudio de la erosión eólica, caracterizado por ser ligero y plegable, donde un ventilador genera una corriente de aire, que entra en una estructura "tubular" desplegable. La estructura es telescópica. Se divide en 3 módulos y se han colocado unas bisagras, que permiten transformarlo en un cubo completamente plegado de reducidas dimensiones. Para completar el conjunto telescópico, se ha diseñado un sistema que permite a las paredes adaptarse a ésta estructura, utilizando patines que deslizan sobre un raíl. La recogida y análisis de las muestras, se realiza con 2 sensores: 1. Un láser-scan, que permite la generación de mapas tridimensionales del suelo, antes y después de ser erosionado. 2. Una cámara de visión industrial, que capta imágenes de las partículas fijadas en una serie de placas con adhesivos, colocadas al final del dispositivo.Universidad de Almerí

Mechanical and tribological properties of alumina/titania coatings deposited by Ooxifuel

En este trabajo se ha estudiado, las fases, las propiedades mecánicas y la resistencia al desgaste abrasivo de recubrimientos cerámicos alumina/titania proyectados por el proceso de oxifuel (spray llama). La proporción de titania tiene una fuerte influencia sobre la porosidad de los recubrimientos, habiéndose observado una disminución casi-lineal de la porosidad con el incremento de titania. Las fases cristalinas que resultan después de la proyección han variado según la naturaleza del polvo y el proceso térmico experimentado. Mientras la dureza obtenida depende sólo del porcentaje en peso de titania, la tenacidad es una función inversa de la dureza, y, la resistencia al desgaste por abrasión es una función creciente con la dureza de los recubrimientosIn this paper the porosity, phases, mechanical properties and abrasive wear resistance of ceramic layers of Al2O3/TiO2 deposited using the flame spray process are evaluated. The proportion of titania has a strong influence on the porosity of the coating, having observed an approximately linear plot decrease with the increasing of titania´s content. Crystalline phases of the deposited layers changed according to the characteristics of the powder and the thermal process employed. It has been observed that hardness depends only on the titania percentage, also toughness decreases with coatings hardness but resistance to abrasive wear traces an increasing lineal plot with this propert

LLAMAS: An acquisition, control and monitoring software for LLAMA

The Large Latin American Millimeter Array is a 12?m Nasmyth antenna to be installed at 4850 m above see level in the Argentinian Atacama Region. LLAMA will operate both in single dish mode and as a VLBI station. LLAMAS is the software, under development, that will acquire the data from the receivers, control the different devices and monitor the safe functioning of the sub-parts. It is based on the ALMA Common Software (ACS), that implements the concept of containers and distributed component objects. It is programmed in JAVA, C++ andPython, and uses the Common Object Request Broker Architecture (CORBA) infrastructure to exchange messages between the subsystems. LLAMAS must be as heterogeneous as the telescope operation: single dish observing modes with simultaneous readouts from single-pixel receivers, and two different polarization channels in continuum (total?power) or spectral mode, single-dish from multi-pixel cameras, and coordinated interferometric observations as a VLBI station. Since the antenna will be located at a very high altitude, the control room will be at a safer lower place 20 km away, and therefore the operation will be remote. Moreover, the high altitude requires the use of disk-less computers and the immediate data transfer to the control room through a fast connection link. It is also envisaged a Web based observing proposal submission and data querying system for the astronomers, making the whole observing process world wide available. In this work we present the conceptual software design of the observation cycle, that we call from the Astronomer to the Astronomer (A2A), and we describe the different subsystems needed to accomplish this goal.Fil: Giménez de Castro, Guillermo C.. Universidade Presbiteriana Mackenzie; BrasilFil: Larrarte, Juan Jose. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; ArgentinaFil: Ibsen, J. J.. Atacama Large Millimiter/submillimeter Array; ChileFil: Abraham, Zulema. Universidade do Sao Paulo. Instituto de Astronomia, Geofísica e Ciências Atmosféricas; BrasilFil: Bareilles, Federico Ariel. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; ArgentinaFil: Hauscarriaga, Fernando Pablo. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; ArgentinaFil: Strauss, C.. National Institute For Space Research; BrasilFil: Zanella, D.. Universidade do Sao Paulo. Instituto de Astronomia, Geofísica e Ciências Atmosféricas; BrasilXXXIX Reunião Anual da Sociedade Astronômica BrasileiraOuro PretoBrasilSociedade Astronômica Brasileir

The Long Latin American Millimeter Array: a new submillimeter facility to observe the Sun

The Long Latin American Millimeter Array (LLAMA), is an Argentinian - Brazilian project to build and operate a 12-m radiotelescope that may observe from 45 to 900 GHz and that will have VLBI capabilities. LLAMA will be installed in the Argentinian "Puna de Atacama" region at 4800 m above see level in the Salta Province, at less than 200 km distance from ALMA. The site has excellent sky transmission characteristics for submillimeter astronomy. LLAMA may observein single dish mode, or as VLBI station associated to ALMA at submillimeter wavelengths or to other telescopes at microwaves. Since it is a multipurpose observatory,it has within its objectives,observing the Sun. In VLBI mode it will have a resolution better than 0.001 arcsec at 1 mm wavelength, bringing unprecedented images of the solar atmosphere with a spatial resolution of the order of 1 km. In single dish mode, it will complement spectral observations already carry out by other telescopes. Key aspects to be addressed by solar LLAMA observations are: i) low atmosphere structure, ii) filaments, iii) dynamics of the chromosphere and its magnetic field and iv) flares. The project received full financial support from the Brazilian Agency FAPESP and the Argentinian Ministry of Science for the installation and operation of the antenna near thetown of San Antonio de los Cobres, and should have its first light by beginning 2015, expecting to start early science on middle 2016. We detail in this work the technical features of LLAMA, its state of advance and the science that may be done with its observations.Fil: Giménez de Castro, Guillermo C.. Universidade Presbiteriana Mackenzie; BrasilFil: Abraham, Zulema. Universidade do Sao Paulo. Instituto de Astronomia, Geofísica e Ciências Atmosféricas; BrasilFil: Arnal, Edmundo Marcelo. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; ArgentinaFil: Gouveia Dal Pino, Elizabete de. Universidade do Sao Paulo. Instituto de Astronomia, Geofísica e Ciências Atmosféricas; BrasilFil: Larrarte, Juan Jose. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; ArgentinaFil: Lepine, Jacques. Universidade do Sao Paulo. Instituto de Astronomia, Geofísica e Ciências Atmosféricas; BrasilFil: Morras, Ricardo. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; ArgentinaFil: Viramonte, Jose Maria. Universidad Nacional de Salta. Facultad de Ciencias Naturales. Instituto Geonorte; Argentina2nd Solar ALMA WorkshopPragaRepública ChecaAcademy of Sciences of the Czech Republic. Astronomical Institut

Geodiversidad mineralógica y petrológica del diapiro de Pinoso y su interés como patrimonio geológico

El diapiro de Pinoso, también denominado Cerro o Cabeҫo de la Sal, está situado al W de la provincia de Alicante, (38º24’ N- 01º02”O), de forma elíptica con eje mayor (NW-SE) de 7,5 km y altura máxima de 893 m, 350 m por encima de la superficie erosiva colindante. Constituido por materiales de facies Keuper, presenta un núcleo de halita que ha sido objeto de explotación, tanto por minería subterránea como por evaporación (extracción y comercialización de sal manantial). También, a principios del siglo XX, aguas procedentes del Cabeҫo fueron utilizadas en un balneario, previo calentamiento del agua. Desde 1973 se explota por disolución y la salmuera extraída es llevada a Torrevieja mediante un salmueroducto y allí pasa a formar parte del proceso de evaporación de explotación de las salinas. La variedad de las litologías presentes en él, así como su riqueza en patrimonio mineral mueble, algunos de los cuales son minerales autigénicos característicos de las facies Keuper, confieren al Cabeҫo de la Sal un notable valor como Patrimonio Geológico, este carácter patrimonial se ve aumentado por los rasgos geomorfológicos asociados al exokarst en materiales yesíferos hipergénicos que genera formas erosivas cualitativa y cuantitativamente muy importantes