Valtra Versy y Direct

Los nuevos modelos Valtra, en sus versiones Versu y Direct, se han refinado las características tradicionales ofrecidas por Valtra añadiéndose otras muchas. De su “diseño tradicional” se destaca la facilidad de manejo en posición invertida utilizando el sistema de conducción reversible Twin-Trac. De lo "nuevo" se destacan sus nuevas transmisiones: transmisión variable continua (CVT), y transmisión múltiple escalonada con cambio bajo carga (Powershift).

Piezoelectric and electroacoustic properties of Ti-doped AlN thin films as a function of Ti content

In this work we present the assessment of the structural and piezoelectric properties of Al(0.5-x)TixN0.5 compounds (titanium content menor que6% atomic), which are expected to possess improved properties than conventional AlN films, such as larger piezoelectric activity, thermal stability of frequency and temperature resistance. Al:Ti:N films were deposited from a twin concentric target of Al and Ti by reactive AC sputtering, which provided films with a radial gradient of the Ti concentration. The properties of the films were investigated as a function of their composition, which was measured by electron dispersive energy dispersive X-ray spectroscopy and Rutherford backscattering spectrometry. The microstructure and morphology of the films were assessed by X-ray diffraction and infrared reflectance. Their electroacoustic properties and dielectric constant were derived from the frequency response of BAW test resonators. Al:Ti:N films properties appear to be strongly dependent on the Ti content, which modifies the AlN wurtzite crystal structure leading to greater dielectric constant, lower sound velocities, lower electromechanical factor and moderately improved temperature coefficient of the resonant frequency.

Análisis de metodologías para el ciclo de vida y desarrollo de productos

Las metodologías para el desarrollo de productos se han convertido en herramientas de vital importancia en el ámbito del desarrollo software debido a que su implantación nos permite estructurar, planificar y controlar el proceso de desarrollo completo de un determinado proyecto y obtener como resultado un producto final exitoso. Por tanto, la elección de una metodología para su implantación en una determinada empresa, es un proceso que requiere especial atención, ya que del éxito o el fracaso de su establecimiento dependerán en gran medida los resultados de los diversos procesos de desarrollo de esa entidad. El trabajo de fin de grado extractado en este documento, tiene como objetivo principal realizar un estudio sobre algunas de las diversas metodologías basadas en líneas de productos software (LPS) presentes en el mercado, tales como el modelo TWIN, el modelo WATCH, el modelo ESPLEP o el modelo SEI. Dicho estudio y la posterior comparativa de los modelos, persigue el propósito de adaptar y concretar alguna de estas metodologías al ciclo de vida de desarrollo habitual en el mercado de la ingeniería de software y más concretamente a los productos desarrollados por la empresa everis. Sin embargo, tras la realización de la comparativa, se llego a la conclusión de que las diferentes características que ofrecen las metodologías a estudio, no satisfacen por completo las necesidades específicas demandadas por everis. Por este motivo, al no poder adaptar ninguno de los modelos, el objetivo principal paso a ser la creación de una metodología propia que aunara las características más importantes de cada uno de los modelos estudiados y se compaginara con las particularidades proporcionadas por el modelo COM exclusivo de everis, obteniendo como resultado un modelo propio de desarrollo ágil, basado en líneas de productos software. Por último, una vez creada la nueva metodología, se buscaba alcanzar dos objetivos finales. El primero es la realización de un pequeño estudio con el propósito de conocer las diversas herramientas “open source” que puedan servir como base o apoyo para la metodología. Y el segundo, realizar un estudio de aplicabilidad del nuevo modelo en un proyecto simulado con el fin de comprobar su efectividad.

The type II secretion system (Xcp) of Pseudomonas putida is active and involved in the secretion of phosphatases.

The genome of the Gram-negative bacterium Pseudomonas putida harbours a complete set of xcp genes for a type II protein secretion system (T2SS). This study shows that expression of these genes is induced under inorganic phosphate (Pi ) limitation and that the system enables the utilization of various organic phosphate sources. A phosphatase of the PhoX family, previously designated UxpB, was identified, which was produced under low Pi conditions and transported across the cell envelope in an Xcp-dependent manner demonstrating that the xcp genes encode an active T2SS. The signal sequence of UxpB contains a twin-arginine translocation (Tat) motif as well as a lipobox, and both processing by leader peptidase II and Tat dependency were experimentally confirmed. Two different tat gene clusters were detected in the P.?putida genome, of which one, named tat-1, is located adjacent to the uxpB and xcp genes. Both Tat systems appeared to be capable of transporting the UxpB protein. However, expression of the tat-1 genes was strongly induced by low Pi levels, indicating a function of this system in survival during Pi starvation.

The type II secretion system (Xcp) of Pseudomonas putida is active and involved in the secretion of phosphatases.

The genome of the Gram-negative bacterium Pseudomonas putida harbours a complete set of xcp genes for a type II protein secretion system (T2SS). This study shows that expression of these genes is induced under inorganic phosphate (Pi ) limitation and that the system enables the utilization of various organic phosphate sources. A phosphatase of the PhoX family, previously designated UxpB, was identified, which was produced under low Pi conditions and transported across the cell envelope in an Xcp-dependent manner demonstrating that the xcp genes encode an active T2SS. The signal sequence of UxpB contains a twin-arginine translocation (Tat) motif as well as a lipobox, and both processing by leader peptidase II and Tat dependency were experimentally confirmed. Two different tat gene clusters were detected in the P.?putida genome, of which one, named tat-1, is located adjacent to the uxpB and xcp genes. Both Tat systems appeared to be capable of transporting the UxpB protein. However, expression of the tat-1 genes was strongly induced by low Pi levels, indicating a function of this system in survival during Pi starvation.

Grain size gradient length scale in ballistic properties optimization of functionally graded nanocrystalline steel plates

The last few years have highlighted the existence of two relevant length scales in the quest to ultrahigh-strength polycrystalline metals. Whereas the microstructural length scale – e.g. grain or twin size – has mainly be linked to the well-established Hall–Petch relationship, the sample length scale – e.g. nanopillar size – has also proven to be at least as relevant, especially in microscale structures. In this letter, a series of ballistic tests on functionally graded nanocrystalline plates are used as a basis for the justification of a “grain size gradient length scale” as an additional ballistic properties optimization parameter.

Speech features of the domain of the word in heterosexual twins during the second yeard of life

Speech is the major function, emergence and which development radically changes all course of formation of the identity of the child already in the early childhood. If language and speech development in solitary born children is investigated today quite well, at twin children this process practically is not studied. Our research was carried out for the purpose of studying of an originality of mastering by speech by heterosexual children of pair of twins within communicative and pragmatist approach (T.N. Ushakov,G. V. Chirkina). Application of this approach to the analysis of process of communication at twin children allowed us to allocate those peculiar receptions and means of communication which they functionally develop in a situation of pair of twins, as allows them to show the phenomena of the speech which are not meeting at solitary born contemporaries. In this work results of supervision and research of pair of heterosexual twins of the second year of the life, carried out by a technique developed by us under the scientific guide of G. V. Chirkina