1,721,267 research outputs found
I sistemi di pianificazione e controllo nelle organizzazioni non orientate al profitto: i risultati di una ricerca sul campo
No full textIo andò. Un cambiamento morfomico in Italia centrale
No full textDiverse varietà italoromanze, antiche e moderne, mostrano una tendenza a confondere la prima e la terza persona del perfetto (cantai > cantò). Si potrebbe trattare di un mutamento speculare a quello che ha portato a distinguere la prima persona dell’imperfetto dalla terza (cantava > cantavo)
Closed form solutions for the time variant spectral characteristics of non stationary random processes
No full textSpectral characteristics are important quantities in describing stationary and non-stationary random processes. In this paper, the spectral characteristics for complex-valued random processes are evaluated and closed-form solutions for the time-variant statistics of the response of linear single-degree-of-freedom (SDOF) and both classically and non-classically damped multi-degree-of-freedom (MDOF) systems subjected to modulated Gaussian colored noise are obtained. The time-variant central frequency and bandwidth parameter of the response processes of linear SDOF and MDOF elastic systems subjected to Gaussian colored noise excitation are computed exactly in closed-form. These quantities are useful in problems which require the use of complex modal analysis, such as random vibrations of non-classically damped MDOF linear structures, and in structural reliability applications. Monte Carlo simulation has been used to confirm the validity of the proposed solutions
A novel technique to alleviate the stiction phenomenon in radio frequency microelectromechanical switches
No full textRadio frequency (RF) microelectromechanical system (MEMS) switches subject to long term actuation suffer from narrowing of the actuation and release voltages. This can lead to the failure of the device when the device remains actuated without external biasing due to stiction effects. The stiction phenomenon is one of the most challenging problems in RF MEMS switches, especially in applications where these devices have to remain actuated for an extended period of time (months or even years). In this letter, we show a novel recovery technique to alleviate the stiction phenomenon significantly increasing the device lifetime. In particular, we show how the flowing of a small current through the suspended membrane can be used to fully restore the device properties to its fresh conditions in just a few seconds
[Le carte cavesi del IX secolo.] Aspetti grafo-fonetici
No full textBy proposing an in-depth analysis of some phonographic features, we aim to demonstrate that our texts can not only serve to reconstruct the history of writing system but also to better understand the development of the phonological system from Latin to Romance
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
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