Search results for "performance"

A DFT study of the vicinal 3J(119Sn,13C) and 3J(119Sn,1H) coupling constants in trimethyl- and chlorodimethyl-stannyl propanoates.

2013

Abstract We have tested the performance of DFT protocols, both at the Scalar relativistic ZORA and non-relativistic level of theory, for the calculation of the 3 J( 119 Sn, 13 C) and 3 J( 119 Sn, 1 H) vicinal couplings for a series of flexible organotin(IV) derivatives with formula XMe2SnCHRCHR′COOMe (X = Me, Cl; R, R′ = Me, Ph). A satisfactory agreement between experimental and calculated vicinal couplings has been obtained by taking into account the conformational behaviour of the compounds investigated. The protocols used, mainly the relativistic one, were found to give a correct picture of the populations and a sufficiently high overall performance in calculating the vicinal couplings, …

On-line high-pressure extraction-high-performance liquid chromatography

1983

Abstract A coupling unit is described that allows on-line operation of a high-pressure extraction apparatus with a high-performance liquid chromatograph. The unit consists of two high-pressure sample-injection valves, connected in series. The first valve operates as a switching valve to the loop and controls the release of pressure along a packed microbore column. Two short, packed microbore columns are positioned between the first and second valve, sampling the extracted compounds over a desired period and simultaneously operating as sample loop for the second valve; the latter is the injector for the high-performance liquid chromatographic column. The unit was tested by continuous extract…

Electromagnetic Full-Wave Simulation of Partial Discharge Detection in High Voltage AC Cables

2019

Partial discharge (PD) activity in the insulation system of an electrical equipment can determine the failure of the whole apparatus. PD sensors are widely used in high-voltage electrical systems as the main elements of a detecting system oriented to real time monitoring. Recently, non-invasive sensors have been proposed in industrial applications for cable and other sensitive electrical parts: they are based both on capacitive and on the electromagnetic radiating coupling. In order to assess the real performance of a new sensor produced by a high voltage AC cables manufacturer, the paper proposes electromagnetic fullwave simulation results.

Serial versus parallel columns using isocratic elution: a comparison of multi-column approaches in mono-dimensional liquid chromatography.

2015

Abstract When a new separation problem is faced with high-performance liquid chromatography (HPLC), the analysis is addressed conventionally with a single column, trying to find out a single experimental condition aimed to resolve all compounds. However, in practice, the system selectivity may be insufficient to achieve full resolution. When a separation fails, the usual practice consists of introducing drastic changes in the chromatographic system (e.g. use of another column, solvent or pH). An alternative solution is taking benefit of the combined separation capability of two or more columns, which can be attained in multiple ways, such as diverse modalities of two-dimensional HPLC, or mo…

Under her eye: immaginari e pratiche spaziali transfemministe a Palermo

2021

L’articolo analizza la performance organizzata da Non Una Di Meno-Palermo nella giornata contro la violenza maschile sulle donne e di genere 2020. Nel corso del presidio, lo spazio urbano è stato risignificato da un’‘Ancella’, riferimento al romanzo e alla serie The handmaid’s tale (Atwood, 1985). Utilizzata più volte dai movimenti transfemministi per rappresentare il controllo e il disciplinamento del corpo femminile, la rappresentazione dell’Ancella assume ulteriori significati nel contesto della pandemia del Covid-19. Il contributo indaga la performance analizzandone da una parte gli aspetti spaziali, in relazione alle altre forme di spazializzazione del movimento; dall’altra gli immagin…

Comparison of voltammetric and high performance liquid chromatographic methods for ascorbic acid determination in infant formulas

1995

Abstract Two methods — voltammetric and high performance liquid Chromatographic (HPLC) — useful for determining ascorbic acid in foods, were compared to ascertain which of them could be used for routine determination of ascorbic acid in infant formulas. Both methods were used to assay 10 identical samples of an adapted cow's milk infant formula and 10 samples of soya protein formula. Precision was determined, the variance of each method was measured, and the methods were compared with each other. The variances of the two methods were not statistically different nor was there any significant difference between the results from the two methods. Therefore, it was concluded that both methods ca…

Global Performance Management for Small and Medium-Sized Enterprises (GPM-SME)

2006

This paper refers to the project GPM-SME — FP6-005857i, included within the 6th Framework Programme of the European Commission, in its CRAFT Programme. The goal of this document is to present the main concepts of Global Performance Management and how the GPM-SME consortium pursues to develop a framework to improve the competitive capability of companies and their network visibility, specially developed for Small and Medium sized Enterprises. This main aim will be achieved in two ways: allowing companies to include Innovation potential in their performance management, and defining new ways to share information among companies in Collaborative Networks(CN) and measuring the capabilities of Vi…

Reliable TDC position determination: a comparison of different thermodynamic methods through experimental data and simulations

2008

It is known to internal combustion researcher that the correct determination of the crank position when the piston is at Top Dead Centre (TDC) is very important, since an error of 1 crank angle degree (CAD) can cause up to a 10% evaluation error on indicated mean effective pressure (IMEP) and a 25% error on the heat released by the combustion: the TDC position should be then known within a precision of 0.1 CAD. This task can be accomplished by means of a dedicated capacitive sensor, which allows a measurement within the required 0.1 degrees precision. Such a sensor has a substantial cost and its use is not really fast; a different approach can be followed using a thermodynamic method, whose…

Heridas. Del martirio a la cruzada

2000

Peut on classer les universités en fonction de leur performance d'insertion ?

2011

Afin de mesurer la qualité de l'insertion de leurs diplômés, la très grande majorité des universités a développé un système d'observation régulier de l'insertion de leurs étudiants. Plus récemment, sous l'impulsion du MESR, une enquête commune à plus de 70 établissements a été réalisée sur les diplômés de master. Si l'objectif était de proposer aux étudiants une information nécessaire sur leurs débouchés professionnels, est apparue rapidement la tentation de classer les universités en fonction de leur "performance" d'insertion. Le travail proposé dans cet article se veut une contribution à la réflexion sur la pertinence d'une telle mesure à partir des enquêtes existantes. Dans une première …