Self-checking on-line testable static RAM

This is a fault-tolerant random access memory for use in fault-tolerant computers. It comprises a plurality of memory chips each comprising a plurality of on-line testable and correctable memory cells disposed in rows and columns for holding individually addressable binary bits and provision for error detection incorporated into each memory cell for outputting an error signal whenever a transient error occurs therein. In one embodiment, each of the memory cells comprises a pair of static memory sub-cells for simultaneously receiving and holding a common binary data bit written to the memory cell and the error detection provision comprises comparator logic for continuously sensing and comparing the contents of the memory sub-cells to one another and for outputting the error signal whenever the contents do not match. In another embodiment, each of the memory cells comprises a static memory sub-cell and a dynamic memory sub-cell for simultaneously receiving and holding a common binary data bit written to the memory cell and the error detection provision comprises comparator logic for continuously sensing and comparing the contents of the static memory sub-cell to the dynamic memory sub-cell and for outputting the error signal whenever the contents do not match. Capability for correction of errors is also included

Comparison of experimental and numerical sloshing loads in partially filled tanks

Sloshing phenomenon consists in the movement of liquids inside partially filled tanks, whichgenerates dynamic loads on the tank structure. Resulting impact pressures are of great importance in assessingstructural strength, and their correct evaluation still represents a challenge for the designer due to the highnonlinearities involved, with complex free surface deformations, violent impact phenomena and influence of airtrapping. In the present paper a set of two-dimensional cases for which experimental results are available areconsidered to assess merits and shortcomings of different numerical methods for sloshing evaluation, namely twocommercial RANS solvers (FLOW-3D and LS-DYNA), and two own developed methods (Smoothed ParticleHydrodynamics and RANS). Impact pressures at different critical locations and global moment induced by watermotion for a partially filled tank with rectangular section having a rolling motion have been evaluated and resultsare compared with experiments

Nanoscale magnetic field mapping with a single spin scanning probe magnetometer

We demonstrate quantitative magnetic field mapping with nanoscale resolution, by applying a lock-in technique on the electron spin resonance frequency of a single nitrogen-vacancy defect placed at the apex of an atomic force microscope tip. In addition, we report an all-optical magnetic imaging technique which is sensitive to large off-axis magnetic fields, thus extending the operation range of diamond-based magnetometry. Both techniques are illustrated by using a magnetic hard disk as a test sample. Owing to the non-perturbing and quantitative nature of the magnetic probe, this work should open up numerous perspectives in nanomagnetism and spintronics

Hydrogen induced optically-active defects in silicon photonic nanocavities

This work was supported by Era-NET NanoSci LECSIN project coordinated by F. Priolo, by the Italian Ministry of University and Research, FIRB contract No. RBAP06L4S5 and by the EPSRC UKSp project. Partial financial support by the Norwegian Research Council is also acknowledged.We demonstrate intense room temperature photoluminescence (PL) from optically active hydrogen- related defects incorporated into crystalline silicon. Hydrogen was incorporated into the device layer of a silicon on insulator (SOI) wafer by two methods: hydrogen plasma treatment and ion implantation. The room temperature PL spectra show two broad PL bands centered at 1300 and 1500 nm wavelengths: the first one relates to implanted defects while the other band mainly relates to the plasma treatment. Structural characterization reveals the presence of nanometric platelets and bubbles and we attribute different features of the emission spectrum to the presence of these different kind of defects. The emission is further enhanced by introducing defects into photonic crystal (PhC) nanocavities. Transmission electron microscopy analyses revealed that the isotropicity of plasma treatment causes the formation of a higher defects density around the whole cavity compared to the ion implantation technique, while ion implantation creates a lower density of defects embedded in the Si layer, resulting in a higher PL enhancement. These results further increase the understanding of the nature of optically active hydrogen defects and their relation with the observed photoluminescence, which will ultimately lead to the development of intense and tunable crystalline silicon light sources at room temperature.Publisher PDFPeer reviewe

Leggere le Indicazioni. Riflessioni e proposte per la scuola dell'infanzia

Il volume presenta il testo delle indicazioni nazionali per il curricolo della scuola dell'infanzia e del primo ciclo d'istruzione, pubblicato in forma ufficiale dal Ministero dell'Istruzione nel 2013, e ne propone un commento per quanto riguarda la parte relativa alla scuola dell'infanzia, mettendo a fuoco alcune tematiche cruciali: l'idea di scuola, di relazione educativa, di contesto, di continuità, di attività professional

The UK's Global Health Respiratory Network: Improving respiratory health of the world's poorest through research collaborations.

Respiratory disorders are responsible for considerable morbidity, health care utilisation, societal costs and approximately one in five deaths worldwide [1-4]. Yet, despite this substantial health and societal burden – which particularly affects the world’s poorest populations and as such is a major contributor to global health inequalities – respiratory disorders have historically not received the policy priority they warrant. For example, despite causing an estimated 1000 deaths per day, less than half of the world’s countries collect data on asthma prevalence (http://www.globalasthmareport.org/). This is true for both communicable and non-communicable respiratory disorders, many of which are either amenable to treatment or preventable

Divergência genética em híbridos de sorgo cultivados sob diferentes níveis de fósforo, em solução nutritiva.

Os objetivos deste trabalho consistiram em identificar a presença de diversidade genética entre acessos de sorgo, em diferentes condições de disponibilidade de P, em solução nutritiva, e determinar quais as características que mais contribuíram para a discriminação dessa divergência. O experimento foi conduzido em casa-de-vegetação, num arranjo fatorial 9x4, sendo nove híbridos de sorgo e quatro doses de P (3, 32, 97 e 129 µM de P.L-1 de solução nutritiva), sob delineamento em blocos ao acaso, com três repetições. Os dados foram submetidos à análise de variância e, posteriormente, ao estudo de dissimilaridade genética, utilizando a matriz de distância generalizada de Mahalanobis e a contribuição relativa das características para a divergência, pelo método de Singh (1981). Concluiu-se que a dose de 3 µM de P.L-1 de solução apresentou valores discrepantes dos demais, sendo desconsiderados seu valores para análise de variância conjunta. Diferenças significativas para todas as características avaliadas foram observadas entre os híbridos, nas doses de P analisadas (32, 97 e 129 µM de P.L-1 de solução nutritiva). A concentração de 97 µM de P.L-1 gerou o maior número de grupos de genótipos. Entretanto, variabilidade genética foi observada também nas demais doses de P. Sob as concentrações de P avaliadas, verificou-se que a característica massa seca total foi a que mais contribuiu para a expressão da dissimilaridade genética entre os híbridos. O híbrido experimental 0735019 apresentou eficiência e responsividade a utilização de P, demonstrando os maiores valores para as características avaliadas nos diferentes níveis de P estudados

Análisis geoquímico de la calidad de agua en el Valle de Chaschuil-Catamarca

El agua es uno de los recursos más significativos de consumo en todo el planeta y especialmente en zonas áridas, como las localidades del departamento Tinogasta, donde las áreas de cultivos presentan una actividad alternativa para el desarrollo de la región. Dado que la cantidad y calidad de agua disponible para diferentes usos es variable, la calidad de agua del acuífero fue evaluado para el uso en cultivos. Por ello, se realizó un estudio para analizar la distribución espacial del acuífero de acuerdo a los parámetros de calidad y para identificar lugares con la mejor calidad basado en el análisis fisicoquímico de las muestras. Los resultados fueron comparados con los valores recomendados por la Organización Mundial de la Salud para el consumo y salud público. Del análisis realizado se puede clasificar las muestras como Aceptable para el riego con moderada restricción de uso, teniendo en cuenta la concentración de carbonatos/bicarbonatos encontrada.Water is one of the most significant consumption resources in the whole planet, especially in arid areas, such as the localities from Tinogasta Department, where crop areas represent an alternative activity for regional development. Since the quantity and quality of water available for different uses is variable, water quality of the aquifer was evaluated for use in crops. Therefore, a study was carried out to analyze the spatial distribution of the aquifer according to quality parameters and to identify places with the best quality based on the physicochemical analysis of the samples. Results were compared with the values recommended by the World Health Organization for public health and consumption. From the analysis carried out, the samples could be classified as acceptable for irrigation with moderate restriction of use, taking into account the carbonate / bicarbonate concentration found.Fil: Ortiz, Erlinda del Valle. Universidad Nacional de Catamarca. Facultad de Tecnología y Ciencias Aplicadas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Niz, Adriana Edith. Universidad Nacional de Catamarca. Facultad de Tecnología y Ciencias Aplicadas; ArgentinaFil: Savio, M. E.. Universidad Nacional de Catamarca. Facultad de Tecnología y Ciencias Aplicadas; ArgentinaFil: Lamas, C. A.. Universidad Nacional de Catamarca. Facultad de Tecnología y Ciencias Aplicadas; ArgentinaFil: Barbieri, N. R.. Universidad Nacional de Catamarca. Facultad de Tecnología y Ciencias Aplicadas; ArgentinaFil: Duchowicz, Pablo Román. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas; Argentin

Revealing Nanoscale Solid-Solid Interfacial Phenomena for Long-Life and High-Energy All-Solid-State Batteries.

Enabling long cyclability of high-voltage oxide cathodes is a persistent challenge for all-solid-state batteries, largely because of their poor interfacial stabilities against sulfide solid electrolytes. While protective oxide coating layers such as LiNbO3 (LNO) have been proposed, its precise working mechanisms are still not fully understood. Existing literature attributes reductions in interfacial impedance growth to the coating's ability to prevent interfacial reactions. However, its true nature is more complex, with cathode interfacial reactions and electrolyte electrochemical decomposition occurring simultaneously, making it difficult to decouple each effect. Herein, we utilized various advanced characterization tools and first-principles calculations to probe the interfacial phenomenon between solid electrolyte Li6PS5Cl (LPSCl) and high-voltage cathode LiNi0.85Co0.1Al0.05O2 (NCA). We segregated the effects of spontaneous reaction between LPSCl and NCA at the interface and quantified the intrinsic electrochemical decomposition of LPSCl during cell cycling. Both experimental and computational results demonstrated improved thermodynamic stability between NCA and LPSCl after incorporation of the LNO coating. Additionally, we revealed the in situ passivation effect of LPSCl electrochemical decomposition. When combined, both these phenomena occurring at the first charge cycle result in a stabilized interface, enabling long cyclability of all-solid-state batteries