Advances in the Development of Micropattern Gaseous Detectors with Resistive Electrodes

We describe the most recent efforts made by various groups in implementing resistive electrodes in micropattern gaseous detectors with the aim to combine in the same design the best features of RPCs (for the example, their robustness and spark protection property) with the high granularity and thus the good position resolution offered by microelectronic technology. In the stream of this activity, we have recently developed two novel detectors with resistive electrodes: one was based on resistive micromeshes and the second one is a MSGC with resistive electrodes. We have demonstrated that the resistive meshes are a convenient construction element for various designs of spark protective detectors: RPCs type, GEM type and MICROMEGAS type. These new detectors enable to considerably enhance the RPC and micropattern detectors applications since they feature not only a high position resolution but also a relatively good energy resolution (25-30 persent FWHM at 6 keV) and, if necessary, they can operate in cascaded mode allowing the achievement of a high overall gas gain. The main conclusion from these studies is that the implementation of resistive electrodes in micropattern detectors makes them fully spark protected; on this basis we consider this direction very promising

Demonstration of new possibilities of multilayer technology on resistive microstrip/ microdot detectors

The first successful attempts to optimize the electric field in Resistive Microstrip Gas Chamber and resistive microdot detectors using additional field shaping strips located inside the detector substrate are describedComment: Presented at the RD-51 mmini week, CERN, June 201

Agricoltura civica e filiera corta. Nuove pratiche, forme di impresa e relazioni tra produttori e consumatori

La crisi dell’economia e della società in atto è interpretata come una crisi sistemica che esige, per essere risolta, un profondo processo di innovazione sociale. Un sentiero di innovazione possibile passa per l’economia dei beni comuni e per la costruzione di una razionalità basata su valori collettivi. L’agricoltura civica raccoglie questa sfida, facendosi carico, oltre che della produzione di alimenti, dei problemi della collettività e dell’ambiente, producendo esternalità positive: sviluppo economico e sociale, inclusione e democrazia alimentare, sviluppo rurale, pratiche agro-ecologiche. Per questo diciamo che l’agricoltura locale e le filiere corte sono solo una faccia dell’agricoltura civica. Inteso come “bene comune”, il cibo è capace di esprimere non solo utilità economiche, ma anche utilità funzionali ad una migliore qualità della vita e alla realizzazione di diritti fondamentali. Le nuove pratiche delle imprese agricole basate sulla multifunzionalità e sulla co-produzione (agricoltura sociale, mercati degli agricoltori, agricoltura locale) si incontrano con le nuove pratiche di consumo critico (Gruppi di acquisto solidale) e possono potenzialmente costruire reti civiche di innovazione sociale portatrici di una nuova domanda di governance, basata sulla sussidiarietà orizzontale e il coinvolgimento della società civile. Il working paper analizza le nuove pratiche diffuse in Italia attorno alla produzione e al consumo di cibo e, tramite il concetto di agricoltura civica, cerca di ricondurre a unità le esperienze emergenti, interpretandole come una possibile risposta alla crisi in atto e la prefigurazione di un cambiamento diretto alla produzione e valorizzazione di beni collettivi

On the physics and technology of gaseous particle detectors

Despite an already long and fruitful history, gaseous elementary-particle detectors remain today an important mainstay of high-energy and nuclear physics experiments and of radiation detection in general. In here we briefly describe some of the gaseous detector's main technologies and applications, along with some unsolved gas-discharge physics aspects of practical relevance.Comment: Submitted to Plasma Sources in Science and Technolog

Mind the gap! A review of Amazonian anurans in GenBank

We studied the knowledge gap in GenBank with regard to the ca. 600 anuran species from Amazonia. The markers 12S, 16S, COI and cytb were examined, on which information was available for about half of all species. Both the number of sample sites and the number of samples per species varied greatly (best studied each in 16S: 4.85 ± 10.37; 11.19 ± 31.20), and merely one fifth of all species had at least 5 sample sites. This suggests that a considerable portion of species is underrepresented in GenBank. Representativeness is especially difficult to assess in widespread species that at the same time could well represent cryptic allopatric species (i.e., with smaller distributions). This is a well-known phenomenon in Amazonian anurans considering that truly widespread species do exist. Moreover, limited sampling may not necessarily be the result of limited representativeness, as numerous species are known to occupy relatively small localised to regional ranges only. Our study furthermore revealed that in a geographic context, major portions of Amazonia have as yet been undersampled. That is, the total of 453 sample sites (most with more than one species sampled) are spatially clustered, often in areas with increased anthropogenic activity. We conclude that there is a large knowledge gap in terms of spatial sampling, resulting in taxonomic deficiencies