Search results for "STAI"
showing 10 items of 5922 documents
An experimental investigation on the poor hydrogen sorption properties of nano-structured LaNi5 prepared by ball-milling
2011
Abstract Nano-structured LaNi5 hydrogen storage materials prepared by ball-milling is analysed using differential scanning calorimetry (DSC) and x-ray photoelectron spectroscopy (XPS). DSC results indicate a partial elimination of defects at 500 °C in a more efficient way for the short-time ball-milled powders compared to the long-time ball-milled ones. XPS results show almost no change in the core-level electronic structure for La and Ni of LaNi5 in the bulk and the nano-structured forms, but gives an indication that the self-restoring mechanism of the active surface observed in the bulk sample (Siegmann et al. Phys. Rev. Lett. 40, 972) may not be occurring in the nano-powders. Results fro…
SPS-assisted preparation of the Magnéli phase WO2.90 for thermoelectric applications
2013
We describe the preparation and simultaneous consolidation of WO2.90 by spark plasma sintering (SPS). SPS allows for the direct manufacturing of large amounts of consolidated material. Synchrotron powder X-ray diffraction indicates that the material is single phase. Microstructure analysis indicates that the pellet is fully dense, allowing high-temperature thermoelectric properties to be reliably measured. The as-prepared samples of WO2.90 reach a ZT of 0.1 at 1100 K.
Investigation of AC Electrical Properties of MXene-PCL Nanocomposites for Application in Small and Medium Power Generation
2021
The paper examined Ti3C2Tx MXene (T—OH, Cl or F), which is prepared by etching a layered ternary carbide Ti3AlC2 (312 MAX-phase) precursor and deposited on a polycaprolactone (PCL) electrospun membrane (MXene-PCL nanocomposite). X-ray Diffraction analysis (XRD) and Scanning Electron Microscopy (SEM) indicates that the obtained material is pure Ti3C2 MXene. SEM of the PCL-MXene composite demonstrate random Ti3C2 distribution over the nanoporous membrane. Results of capacitance, inductance, and phase shift angle studies of the MXene-PCL nanocomposite are presented. It was found that the frequency dependence of the capacitance exhibited a clear sharp minima in the frequency range of 50 Hz to o…
A simple model for computing diffuse solar radiation
1989
In this paper a very simple model for predicting the daily diffuse solar radiation at any Italian location using as input few extensively measured meteorological parameters is proposed. In fact the daily diffuse radiation D, MJ.m−2.day−1, here is correlated with only the relative sunshine duration sS and the noon altitude of the sun on the 15th of the month hn, degrees, by the following equation: D=7(sS−(sinhn)1.55 . The validity of this formula is verified using monthly mean daily data from four Italian stations displaced at various latitudes or altitudes or geographical situations (inland or coastal site). The test results show that the deviations between the measured and the computed val…
Instantaneous hourly and daily radiation on tilted surfaces
1991
A simple model to evaluate the irradiance incident on tilted surfaces of various orientations is proposed in this paper. It is based on the knowledge of the monthly daily average values of global and diffuse radiation on horizontal surfaces and their distributions over a period of a day. These distributions are approximated by a modified Gaussian expression with two parameters, which take into account the morning-to-afternoon asymmetries. Integrating the irradiance over a period of an hour or a day, values of monthly hourly average and daily on variously oriented surfaces have been calculated for the locations of Barcelona, Genoa, and Montreal. The calculated values are generally in good ag…
Instantaneous distribution of global and diffuse radiation on horizontal surfaces
1991
Abstract The aim of this paper is to obtain a general expression for estimating both the instantaneous global and diffuse radiations on horizontal surfaces from the respective daily values. The proposed expression is a modified Gaussian distribution with two parameters which take into account its width and the asymmetries between morning and afternoon hours. The performance of the method has been tested by comparing the theoretical hourly results with the experimental data of six actinometric stations with different geographical location and climatic conditions. The comparison has shown that the method here proposed is accurate for both the diffuse and global radiation.
The environmental product declaration EPD with a particular application to a solar thermal collector
2003
The principles of sustainable development and of Integrated Product Policy are applied in new voluntary regulations, which have been internationally agree. The aim is to grant transparency of environmental information and to promote the diffusion of environmentally friendly products. A new tool under study is the Environmental Product Declaration (EPD), a technical paper annexed to products that synthesises their energy and environmental performances. This paper points out the reasons for developing EPD for the energy sector, and puts special focus upon renewable energy systems, products whose environmental performances are often not clearly defined. We describe how results of a LCA upon a …
Digitaalisesti kiinni nuorten luku- ja oikeinkirjoitustaidon arviointiin toisella asteella
2020
Luku- ja kirjoitustaitoa on seulontavaiheessa perinteisesti arvioitu paperisella arviointivälineellä. Arvioinnin työläys ja verkkopohjaisen lukemisen yleistyminen ovat digitaalisen arviointivälineen kehittämiseen johtaneita syitä. Niilo Mäki Instituutissa tutkimusperustaisesti kehitetty DigiLukiseula tehostaa arviointia toisella asteella, jolloin opiskelijoiden tukemiseen jää enemmän aikaa. Digitaalisuus tuo myös uusia ulottuvuuksia arviointityöhön. DigiLukiseulan käsikirja on luettavissa osoitteessa digilukiseula.nmi.fi. peerReviewed
Capturing and Indexing Rehearsals: The Design and Usage of a Digital Archive of Performing Arts
2015
International audience; Preserving the cultural heritage of the performing arts raises difficult and sensitive issues, as each performance is unique by nature and the juxtaposition between the performers and the audience cannot be easily recorded. In this paper, we report on an experimental research project to preserve another aspect of the performing arts—the history of their rehearsals. We have specifically designed non-intrusive video recording and on-site documentation techniques to make this process transparent to the creative crew, and have developed a complete workflow to publish the recorded video data and their corresponding meta-data online as Open Data using state-of-the-art audi…
The right to protection against poverty and social exclusion as a paradigm of respect for human dignity. The integration of the minimum vital income …
2020
La efectividad del derecho a la protección contra la pobreza y la exclusión social constituye la tarea más excelsa del jurista, tendente a conseguir el objetivo último de la Justicia y el respeto de la Dignidad Humana. Con tal premisa, en primer lugar, el autor defiende que tal derecho, por su carácter multifacético, ilustra de manera paradigmática el carácter indivisible de todos los derechos humanos. En segundo término, el artículo analiza la progresiva consolidación de los estándares internacionales (universales y europeos) en el ámbito de la erradicación de la pobreza y la exclusión social, poniendo el acento en el papel crucial del artículo 30 de la Carta Social Europea y de la jurispr…