Reseña/Review (Espín, Manuel (Coord.) Adolescentes digitales. Revista Estudios de Juventud, Nº 92, INJUVE, Madrid, 2011)

Espín, Manuel (Coord.)(2011) Adolescentes Digitales.  Revista Estudios de Juventud, Nº 92. Marzo 2011. INJUVE, Madrid."Adolescentes digitales" se nos muestra como una obra que pretende explorar desde distintos puntos de vista la realidad de la generación conocida como “nativos digitales” (Prensky), la generación actual de adolescentes que ha crecido con internet y el mundo digital como su entorno normal de socialización

Estudio ecofuncional de la microbiota asociada a suelos de interés vitivinícola

El suelo es el principal recurso del que disponemos para hacer frente a la creciente demanda mundial de alimentos. Las prácticas agrícolas determinan el uso sostenible del suelo para evitar procesos de desertización y aumentar el rendimiento productivo. En distintas parcelas de suelos con prácticas vitivinícolas se han estudiado las principales variables abióticas y bióticas que contribuyen a un aumento en la producción, atendiendo a los principales estados fisiológicos de la vid. En este estudio se ha determinado la Capacidad de Campo, cuyos valores oscilan entre 42,09 y 165,90 ml H2O/kg de suelo. La medida del pH determina los procesos biogeoquímicos que se cursan en el suelo, en este caso el pH está determinado por presencia de CaCO3, definiendo un suelo fuertemente alcalino. Las actividades fosfatasa y deshidrogenasa son indicadores de la actividad microbiana total del suelo, debido al pH básico, se determinó la actividad enzimática fosfatasa alcalina obteniendo valores de 31,6 mg y 132,9 PNP/kg•h, similares a los encontrados en cultivos de maíz con un pH similar. Los valores obtenidos con la actividad deshidrogenasa están en torno a una media de 44 mg INTF/kg•h, muy superior a la actividad en otros suelos agrícolas. Se ha observado una predominancia de microorganismos viables fijadores de nitrógeno alcanzando el 43% de presencia en el estado fisiológico de Lloro. El SIR durante la fase de Reposo se correlaciona linealmente con el recuento microbiano de heterótrofos (Coef. correlación=0,87). El estado fisiológico de Reposo es el que presenta mayor biodiversidad (Índice de Shannon) edáfica

Design and analysis of efficient synthesis algorithms for EDAC functions in FPGAs

Error Detection and Correction (EDAC) functions have been widely used for protecting memories from single event upsets (SEU), which occur in environments with high levels of radiation or in deep submicron manufacturing technologies. This paper presents three novel synthesis algorithms that obtain areaefficient implementations for a given EDAC function, with the ultimate aim of reducing the number of sensitive configuration bits in SRAM-based Field-Programmable Gate Arrays (FPGAs). Having less sensitive bits results in a lower chance of suffering a SEU in the EDAC circuitry, thus improving the overall reliability of the whole system. Besides minimizing area, the proposed algorithms also focus on improving other figures of merit like circuit speed and power consumption. The executed benchmarks show that, when compared to other modern synthesis tools, the proposed algorithms can reduce the number of utilized look-up tables (LUTs) up to a 34.48%. Such large reductions in area usage ultimately result in reliability improvements over 10% for the implemented EDAC cores, measured as MTBF (Mean Time Between Failures). On the other hand, maximum path delays and power consumptions can be reduced up to a 17.72% and 34.37% respectively on the placed and routed designs.This work was supported by the Spanish Ministry of Educacion, Cultura y Deporte under the grant FPU12/05573, and by the Spanish Ministry of Economıa project ESP2013-48362-C2-2-P, in the frame of the activities of the Instrument Control Unit of the Infrarred Instrument of the ESA Euclid Mission carried out by the Dept. of Electronics and Computer Technology of the Universidad Politécnica de Cartagen

Structure of 5-(p-n-Glucopyranosyl)barbituric Acid Trihydrat

C 1oH15N 307.3H20, M,= 343·3, monoclinic, P21, a= 10·883 (3), b = 12·497 (20), e=rings for the two molecules are 80·9 (3) and 90·3 (3)0 • The molecules are linked by an extensive three­10·553 (4)Á, {3= 91·05 (3)0 , V= 1435 (2)Á3 Z=4, dimensional hydrogen-bonding network, involving the Dm = 1·57 (2), Dx = 1·589 Mg m-3, Mo Ka, A.= 0·7107 Á, 11 = 0·13 mm-t, F(OOO) = 728, T= 300 K, R = 0·064 for 2692 observed independent refl.exions. The compound presents a zwitterionic structure in which the negative charge is delocalized in the system formed by the two carbonyl groups at C4 and C6 and the carbon atom e5 of the barbituric ring. In the two independent molecules in the asymmetric unit the pyranose ring adopts a 4C1 conformation and the dihedral angles between the pyranose and barbituric water hydration molecules, which stabilize the crystal structure

X-ray Structure and Thermal Motion of Barium N-Dithioearboxylatoglyeinate Trihydrate

Ba2+.C3H3NO2S2-.3H2 O, Mr=340.6 , triclinic, P1, a = 7.906 (1), b = 7.905 (1), c = 8.000 (1) A, ct= 96.34 (1), fl= 100.08 (1), 7= 93.54 (1)% V= 487.6 (1)A 3, Z- 2, Din= 2.31 (1), D x = 2.320 Mg m -3, 2(Mo Kct) = 0.7107/k, # = 4.47mm -1, F(000)=324, room temperature, final R = 0.044 (wR = 0.050) for 3235 observed reflexions. The anionic group is not planar and the S--C [1.717 (6) A] and C(sp2)-N [1.322 (8) A] bonds show a high double-bond character. The structure consists of infinite layers of organic anions along [100] with barium ions connected on both sides of these layers, where an extended two-dimensional hydrogen-bonding system, involving the water molecules, holds together the adjacent anions. Thermal-motion analysis reveals a good fit to a simple rigid-body model for the anion and no significant internal modes should exist

X-ray Structure and Molecular-Packing Analysis of l'-(p-Bromophenyl)-3'-ethyl- 1 ',3 ',4',5 '-tetrahy dro- 1,2-dideo xy-D-glycero-ot-D-galacto-heptofuranoso[ 2, l-d]imidazole- 2'-thione Monohydrate

6- (p-Bromophenyl)-4-ethyl-3-hydroxy-2- (1,2,3-trihydroxypropyl)-2,3,3 a,5,6,6 a-hexahydrofuro- [2,3-d]imidazole-5(4H)-thione monohydrate, C16H21- BrN2OsS.H20, Mr----451.3, orthorhombic, P21212 l, a = 6.073 (3), b = 15.977 (8), c = 19.213 (9) A, V= 1864 (2) A 3, Z = 4, D m = 1.62 (1), D x-- 1.61 Mg m -a, 2(Mo Ka) = 0.7107 A, g= 2.32 mm -1, F(000) = 928, room temperature, final R = 0.080 for 2147 observed reflexions. The sugar ring adopts the 4E conformation and the dihedral angle in the bicyclic system is 115.0 (3) °. A three-dimensional network of hydrogen bonds links the molecules to stabilize the crystal structure. The lattice energy was computed in the atom-atom approach using van der Waals potential functions. These calculations account satisfactorily for all the features of the crystal packing, including rotation about selected bonds in the molecul