Search results for "Direct"
showing 10 items of 2669 documents
The performance of the cryogenic buffer-gas stopping cell of SHIPTRAP
2018
Direct high-precision mass spectrometry of the heaviest elements with SHIPTRAP, at GSI in Darmstadt, Germany, requires high efficiency to deal with the low production rates of such exotic nuclides. A second-generation gas stopping cell, operating at cryogenic temperatures, was developed and recently integrated into the relocated system to boost the overall efficiency. Offline measurements using 223Ra and 225Ac recoil-ion sources placed inside the gas volume were performed to characterize the gas stopping cell with respect to purity and extraction efficiency. In addition, a first online test using the fusion-evaporation residue 254No was performed, resulting in a combined stopping and extrac…
Modeling and Experimental Validation of a Voltage-Controlled Split-Pi Converter Interfacing a High-Voltage ESS with a DC Microgrid
2023
The Split-pi converter can suitably interface an energy storage system (ESS) with a DC microgrid when galvanic isolation is not needed. Usually, the ESS voltage is lower than the grid-side voltage. However, limitations in terms of the ESS current make the use of a high-voltage ESS unavoidable when high power levels are required. In such cases, the ESS voltage can be higher than the microgrid voltage, especially with low microgrid voltages such as 48 V. Despite its bidirectionality and symmetry, the Split-pi exhibits a completely different dynamic behavior if its input and output ports are exchanged. Thus, the present work aims to model the Split-pi converter operating with an ESS voltage hi…
Common and form-specific cell wall antigens of Candida albicans as released by chemical and enzymatic treatments.
1996
In order to investigate the antigenic properties of the proteins and mannoproteins present in the cell surface of Candida albicans, and to identify individual antigenic moieties and their distribution, a number of polyclonal antisera were obtained by immunizing rabbits with chemical and enzymatic cell wall extracts obtained from intact cells from both growth forms (yeast and mycelium) of the fungus. Prior to injection, wall moieties present in the extracts were subjected to different treatments and/or purification procedures such as adsorption onto polystyrenelatex microbeads or electrophoretic separation. When used as probes in indirect immunofluorescence assays, the different antisera gav…
Signal detection for spread spectrum communication systems with gradient algorithm
2012
Retrieval process of original symbols of a spread spectrum based communication system is tried to be improved by Gradient Algorithm (GA) and Blind Source Separation (BSS) principles. Two simple schemes, based on two energy functions are presented. Time correlation properties of the channel are used as advantages in developing the filter coefficients for the receiver. Direct Sequence - Code Division Multiple Access (DS-CDMA) technique based system setup is used for algorithm testing purposes. This is identified as one of the most stable spread spectrum communication technique where most of the technologies developed for that are highly compatible with High Speed Packet Access (HSPA) transmis…
Staphylococcal alpha-toxin: formation of the heptameric pore is partially cooperative and proceeds through multiple intermediate stages.
1997
Staphylococcal alpha-toxin is a 293 residue polypeptide that assembles into pore-forming heptamers, residues 118-140, thereby inserting to form an amphipathic beta-barrel in the lipid bilayer. Fluorometric analyses were here conducted using cysteine-substitution mutants site-specifically-labeled at positions 35 or 130 with the environmentally-sensitive fluorophore acrylodan. In conjunction with functional assays, three conformational states of the heptamer were defined, which may represent transitional configurations of the toxin molecule along its way to membrane insertion and pore formation. The first was the freshly assembled, SDS-sensitive heptamer alpha7*a, where a minor alteration in …
Note brevi a margine della proposta di riforma dei reati ambientali del gruppo di studio dell'associazione dei professori di diritto penale
2022
A partire dall’analisi della proposta di riforma dei reati contro l’ambiente elaborata dal Gruppo di studio dell’Associazione italiana dei Professori di Diritto Penale, il contributo riflette sui principali problemi teorici del diritto penale ambientale (tipizzazione dell’evento lesivo nelle fattispecie di inquinamento e di disastro ambientale, imputazione soggettiva dei delitti aggravati dall’evento, contrasto penale alle c.d. “ecomafie” nel settore dei rifiuti ecc.), mettendo a confronto le soluzioni suggerite nel testo con le prospettive di riforma contenute nella recente Proposta di Direttiva del Parlamento europeo e del Consiglio sulla Protezione dell’ambiente at- traverso il diritto p…
The Current European Normative Frame
2016
The rapid introduction of the normative frame on the European scale, both communally and nationally, follows the historical investigation presented in the first chapter of this dissertation, with a double purpose: to define the issues of the current debate on the one hand and to describe the state of the art on the other. Directive 2001/42/EC of the European Parliament and Council of 27 June 2001 concerning the assessment of effects of certain plans and programmes on the setting was officialised in July of that year, generating a wide range of experiences. It establishes a basic framework that should be adopted by the member states of the European Union. In the previous chapter, we showed t…
Principle and analytical applications of resonance lonization mass spectrometry
1989
Resonance ionization mass spectrometry (RIMS) is a very sensitive analytical technique for the detection of trace elements. This method is based on the excitation and ionization of atoms with resonant laser light followed by mass analysis. It allows element and, in some cases, isotope selective ionization and is applicable to most of the elements of the periodic table. A high selectivity can be achieved by applying three step photoionization of the elements under investigation and an additional mass separation for an unambiguous isotope assignment. An effective facility for resonance ionization mass spectrometry consists of three dye lasers which are pumped by two copper vapor lasers and of…
Temporal aggregation in chain graph models
2005
The dependence structure of an observed process induced by temporal aggregation of a time evolving hidden spatial phenomenon is addressed. Data are described by means of chain graph models and an algorithm to compute the chain graph resulting from the temporal aggregation of a directed acyclic graph is provided. This chain graph is the best graph which covers the independencies of the resulting process within the chain graph class. A sufficient condition that produces a memory loss of the observed process with respect to its hidden origin is analyzed. Some examples are used for illustrating algorithms and results.
Visualizing the flow of evidence in network meta-analysis and characterizing mixed treatment comparisons
2013
Network meta-analysis techniques allow for pooling evidence from different studies with only partially overlapping designs for getting a broader basis for decision support. The results are network-based effect estimates that take indirect evidence into account for all pairs of treatments. The results critically depend on homogeneity and consistency assumptions, which are sometimes difficult to investigate. To support such evaluation, we propose a display of the flow of evidence and introduce new measures that characterize the structure of a mixed treatment comparison. Specifically, a linear fixed effects model for network meta-analysis is considered, where the network estimates for two trea…