Design of the Target Dump Injection Segmented (TDIS) in the framework of the High Luminosity Large Hadron Collider (HL-LHC) project

The High Luminosity Large Hadron Collider (HL-LHC) Project at CERN calls for increasing beam brightness and intensity. In this scenario, most equipment has to be redesigned and rebuilt. In particular, beam intercepting devices (such as dumps, collimators, absorbers and scrapers) have to withstand impact or scraping of the new intense HL-LHC beams without failure. Furthermore, minimizing the electromagnetic beam-device interactions is also a key design driver since they can lead to beam instabilities and excessive thermo-mechanical loading of devices. In this context, the present study assesses the conceptual design quality of the new LHC injection protection absorber, the Target Dump Injection Segmented (TDIS), from an electromagnetic and thermo-mechanical perspective. This contribution analyzes the thermo-mechanical response of the device considering two cases: an accidental beam impact scenario and another accidental scenario with complete failure of the RFcontacts. In addition, this paper presents the preliminary results from the simulation of the energy deposited by the two counter-rotating beams circulating in the device

Inversion of the anomeric configuration of the transferred sugar during inactivation of the macrolide antibiotic oleandomycin catalyzed by a macrolide glycosyltransferase

AbstractMacrolides are a group of antibiotics structurally characterized by a macrocyclic lactone to which one or several deoxy-sugar moieties are attached. The sugar moieties are transferred to the different aglycones by glycosyltransferases (GTF). The OleI GTF of an oleandomycin producer, Streptomyces antibioticus, catalyzes the inactivation of this macrolide by glycosylation. The product of this reaction was isolated and its structure elucidated. The donor substrate of the reaction was UDP-α-D-glucose, but the reaction product showed a β-glycosidic linkage. The inversion of the anomeric configuration of the transferred sugar and other data about the kinetics of the reaction and primary structure analysis of several GTFs are compatible with a reaction mechanism involving a single nucleophilic substitution at the sugar anomeric carbon in the catalytic center of the enzyme

Impuesto sobre la Renta de las Personas Físicas. Novedades legales para 1995

El antecedente de esta ley es la Ley 30/1972, de 22 de julio, de régimen Económico-Fiscal Especial de Canarias, aunque los aspectos fiscales de este REF se modificaron a través de la Ley 20/1991, de 7 de junio, aplazándose entonces la reforma de los aspectos económicos

Modificaciones en el Impuesto sobre la Renta de las Personas Físicas por el R.D.-L. 12/1995, de prórroga de los Presupuestos Generales del Estado para 1996, y por la Ley 43/1995, del Impuesto sobre Sociedades

A continuación se analizan los artículos del Real Decreto-Ley que modifican preceptos de la Ley 18/1991 del IRPF: • Artículo 13 del Real Decreto-Ley. Modifica el artículo 34 b) de la Ley 18/1991: Rendimientos íntegros de determinados bienes inmuebles. Lo primero que cabe señalar es que esta modificación tiene efectos desde 1 de enero de 1995 y que su finalidad es unificar la base de imputación a efectos de la estimación de ingresos para los inmuebles urbanos no arrendados, que será en todo caso el valor catastral. En cuanto a porcentajes, reduce hasta el 1'1 por 100 el aplicable en los casos en que el valor catastral esté revisado. Recordemos que en 1994 este porcentaje era del 1'3 por 100

“Amado y aborrecido”: la edición de Juan de Vera Tassis y su modus operandi

Los estudios textuales más recientes sobre las comedias de Calderón apuntan a que Juan de Vera Tassis, el temprano editor de sus partes, accedió a testimonios autorizados hoy perdidos que explican los cambios sustanciales que presentan sus ediciones. El caso de Amado y aborrecido revela que este tuvo que ser, sin lugar a duda, su modus operandi; se sirvió de, al menos, dos textos base: la Quinta parte y un testimonio superior desconocido con lecturas genuinamente calderonianas. La edición de Vera de 1691 cuenta con una escena de más de cincuenta versos ausentes en el resto de testimonios. No obstante, esos versos ya figuraban en el texto que se empleó para una reposición de la comedia de 1667 en Viena. De este modo, su edición es realmente valiosa en tanto que posee lecturas de Calderón que, de otra manera, no habrían llegado a nosotros.The most recent textual studies of Calderon’s plays indicate that Juan de Vera Tassis, the early editor of the partes, had access to authorised witnesses, now missing, that explain the substantial changes present in his editions. The case of Amado y aborrecido reveals that his modus operandi has to undoubtedly have been as follows: he made use of, at least, two basic texts: the Quinta parte and a superior unknown witness with Calderon’s genuine readings. Vera’s edition of 1691 contains a scene of more than fifty lines not included in any other witness. Nevertheless, these lines had already appeared in the text of the 1667 revival of the play that had taken place in Vienna. In this way, Vera’s edition becomes truly valuable as it has readings by Calderon that would not otherwise have survived

A Piezoelectric Minirheometer for Measuring the Viscosity of Polymer Microsamples

This paper describes the electromechanical design, operating principles and performance of a rheometer able to characterize the rheological behavior of microsamples of viscoelastic materials, such as polymer solutions, melt, and rubbers. It was developed with a view to portability, robustness, and ease of operation for very small samples. The rheometer operates by subjecting the samples to small-amplitude sinusoidal strain rates via an inverse piezoelectric actuator and detecting the stress response of the material via a direct piezoelectric sensor. The device operates under frequency-sweep mode in a very wide range of frequencies. Required sample sizes are typically three orders of magnitude smaller than for conventional rheometers. Owing to its lack of moving parts, the rheometer has an extremely simple design and is insensitive to vibration. Measurements on pressure-sensitive adhesives and other polymeric systems are presented and validated against a standard cone-and-plate rheometer

Collective excitations in liquid D2 confined within the mesoscopic pores of a MCM-41 molecular sieve

We present a comparative study of the excitations in bulk and liquid D2 confined within the pores of MCM-41. The material (Mobile Crystalline Material-41) is a silicate obtained by means of a template that yields a partially crystalline structure composed by arrays of nonintersecting hexagonal channels of controlled width having walls made of amorphous SiO2. Its porosity was characterized by means of adsorption isotherms and found to be composed by a regular array of pores having a narrow distribution of sizes with a most probable value of 2.45 nm. The assessment of the precise location of the sample within the pores is carried out by means of pressure isotherms. The study was conducted at two pressures which correspond to pore fillings above the capillary condensation regime. Within the range of wave vectors where collective excitations can be followed up (0.3<Q<3.0 $\AA$&#8722;1), we found confinement brings forward a large shortening of the excitation lifetimes that shifts the characteristic frequencies to higher energies. In addition, the coherent quasielastic scattering shows signatures of reduced diffusivity.Comment: 6 page

Digitally continuous multivalued functions

We introduce in this paper a notion of continuity in digital spaces which extends the usual notion of digital continuity. Our approach uses multivalued maps. We show how the multivalued approach provides a better framework to define topological notions, like retractions, in a far more realistic way than by using just single-valued digitally continuous functions. In particular, we characterize the deletion of simple points, one of the most important processing operations in digital topology, as a particular kind of retraction