1,720,967 research outputs found
Evidenze e prospettive sugli utilizzi dei conti fisici per le politiche pubbliche
No full textLe informazioni fornite dalla Contabilità Ambientale trovano un’ampia gamma di utilizzi e applicazioni, direttamente o indirettamente rilevanti nel disegno, monitoraggio e valutazione delle politiche pubbliche. I conti ambientali sono gli strumenti di elezione in tutti i casi in cui sia richiesta la coerenza dell’informazione ambientale con quella fornita dal Sistema dei Conti Economici Nazionali. In particolare, i conti fisici e gli indicatori da essi derivati,
possono essere utilizzati – oltre che per la descrizione accurata del metabolismo socioeconomico, come nei vari esempi forniti nelle prime due parti del volume – in sistemi informativi complessi, in analisi descrittive a livello settoriale (ad esempio profili ambientali), nei modelli economici che includono o hanno ad oggetto variabili ambientali (quali l’analisi input output estesa ai flussi fisici e i modelli predittivi), in analisi volte a valutare i progressi in termini di disaccoppiamento tra crescita economica e pressioni ambientali e in generale a supporto non solo del monitoraggio ma anche di altre fasi del ciclo delle politiche, e in particolare del loro disegno e attuazione. Il contributo esamina alcuni utilizzi dei conti ambientali e/o indicatori derivati da essi sono ormai consolidati non solo nel nostro paese, ma anche a livello globale
Interface Trap State Characterization of Metal-Insulator-Semiconductor Structures Based on Photosensitive Organic Materials
No full textFlexible organic and printed electronics has led in the last years to exciting applications, especially for what concerns devices incorporating photosensitive materials. Among the latter, organic field-effect phototransistors are a promising technology because of the high light-sensitivity and the possibility of being integrated within more complex systems. Nevertheless, their optimization has not been thoroughly investigated and considerable variations are often observed in their behavior. In this framework, the most critical aspect is represented by the interface formed between the organic semiconductor and the employed dielectric layer. In our contribution, we have fabricated metal-insulator-semiconductor (MIS) structures based on the archetypal photosensitive organic materials poly(3-hexylthiophene) (P3HT) and [6,6]-phenyl C61-butyric acid methyl ester (PC61BM) on Silicon/SiO2 substrates, exploiting their blend in a bulk heterojunction configuration. The MIS structures have been characterized by means of admittance spectroscopy to study the properties of the trap distribution at the interface between the organic semiconductors and the silicon oxide insulating layer. The complex behavior of the capacitance and loss diagrams has been interpreted with a simple electrical model to extract the density of the traps at the interface between the insulator and the semiconductor. It is shown that in the blend-based MIS device several peaks arise in the loss diagram with respect to the only P3HT MIS device. This could be attributed to a different interaction between the single species in the bulk heterojunction and the silicon oxide layer. Furthermore, the reported values of trap densities result in the range of those determined for analogous structures and materials
Embeddable Circuit for Orientation Independent Processing in Ultra Low-Power Tri-axial Inertial Sensors
No full textIn this work, a new custom circuit is proposed to make the acquisitions of low-power tri-axial accelerometers independent from the spatial orientation of the sensors. For the purpose, a new vector rotation algorithm has been developed in order to reduce the overall computational effort and the complexity of the resulting circuit. The modularity of the computational scheme and the specific design choices have limited the area occupancy and the power dissipation of the circuit to negligible values with respect to the circuitry embedded in typical low-power accelerometers. The design has been prototyped with a Xilinx Artix-7 FPGA, where it achieves a maximum throughput of 81.2 kHz. Synthesis using a 65 nm CMOS standard cells library provides a maximum throughput of 223 kHz and an occupied area of 0.024 mm2. By setting the sample rate of the sensor to 25 Hz used as reference in many motion sensing applications, the standard cells power dissipation is about 1 W. Comparisons with the state-of-the-art in the literature show a maximum area and power reduction of 40% and 55%, respectively
A Bit-Line Voltage Sensing Circuit With Fused Offset Compensation and Cancellation Scheme
No full textA systematic offset voltage occurs in sense amplifiers for SRAMs, mainly due to the mismatch between the threshold voltages of MOS transistors. This offset affects the reading operations of SRAMs in terms of accuracy, delay and power consumption. In this paper, a bit-line voltage sense amplifier is presented, which combines offset compensation and cancellation features. The circuit operations are carried out in four phases, in which two CMOS amplifiers are used as line buffers and they are pre-charged in the high voltage gain region in order to reduce the effects of the offset. The proposed sense amplifier has been designed and prototyped in 180 nm CMOS technology. It is capable to correct a voltage offset up to 100 mV and exhibits a minimum access time of 58 ps. These results overcome other solutions in applications where sub-threshold operations are not required and an aggressive voltage scaling is not convenient
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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