This contribution presents a state-space framework for performing the reliability analysis of uncertain structural systems in the presence of active control and stochastic excitation. The control ...framework is general enough to allow use of modern robust techniques, e.g.
H
2 and
H
∞, as well as more classical regulations such as LQG. To deal with system uncertainties, the perturbative version of the finite-element method is adopted with the aim of computing the statistics of the extreme response of the structure. Eventually, reliabilities are computed via asymptotic techniques for both the controlled and uncontrolled cases within a few numerical examples.
The concentration problem of maximizing signal strength of bandlimited and timelimited nature is important in communication theory. In this paper we consider two types of concentration problems for ...the signals which are bandlimited in disjoint frequency-intervals, which constitute a band-pass filter. For the first type the problem is to determine which members of
L
2
(−∞,∞) lose the smallest fraction of their energy when first timelimited and then bandlimited. For the second type the problem is to determine which bandlimited signals lose the smallest fraction of their energy when restricted to a given time interval. For both types of problems, basic theoretical properties and numerical algorithms for solution and convergence theorems are given. Orthogonality properties of analytically extended eigenfunctions over
L
2
(−∞,∞) are also proved. Numerical computations are carried out which corroborate the theory. Relationship between eigenvalues of these two types of problems is also established. Several properties of eigenvalues of both types of problems are proved.
Frontotemporal lobar degeneration (FTLD) is a progressive neurodegenerative disorder characterized by behavioral and language disturbances. We performed a case-control association study in the ...Italian population to assess the relevance for FTLD genetic susceptibility of the serotonin (5-HT) transporter gene-linked polymorphic region rs4795541, alias short (S)/long (L) an in/del polymorphism of the promoter region of the gene coding for the 5-HT transporter (SLC6A4). This functional polymorphism was reported to influence the SLC6A4 transcription rate, with the S-allele having a two-fold reduced efficiency. We collected 225 independent subjects (74 sporadic FTLD and 151 age-matched healthy controls, CT) that were genotyped for the rs4795541, the SLC6A4 single nucleotide polymorphisms (SNP) rs25531 and rs6354, and the apolipoprotein E (APOE) allelic variants. A significant correlation P = 0.018, OR (95% CI): 2.1 (1.1-3.9) between rs4795541 S-allele presence and FTLD susceptibility was found. In summary, the rs4795541 might be important for FTLD susceptibility in the Italian population.
A cDNA homologous to the ethylene‐response sensors (ERS/ETR1) from Arabidopsis thaliana was isolated from a Rumex palustris cDNA library. This cDNA, RP‐ERS1, was 2421 bp long and shared 66% ...nucleotide homology with ETR1 and ERS in their coding regions. The transcript level of RP‐ERS1 was actively regulated during the leaf‐elongation response of R. palustris upon flooding. RP‐ERS1 transcript levels increased after submergence, and also after exposure to high concentrations of ethylene and carbon dioxide and low concentrations of oxygen. These results suggest that R. palustris plants may respond to flooding stress by increasing the number of their ethylene receptors.
We report on an apparatus able to measure the absolute detection efficiency of a detector for electrons in the 30 - 900 eV range. In particular, we discuss the characterisation of a two-stage chevron ...microchannel plate (MCP). The measurements have been performed in the LASEC laboratory at Roma Tre University, whit a custom-made electron gun. The very good stability of the beam current in the fA range, together with the picoammeter nominal resolution of 0.01 fA, allowed the measurement of the MCP absolute efficiency \(\epsilon\). We found an \(\epsilon\) = (0.489 \(\pm\) 0.003) with no evident energy dependence. We fully characterised the MCP pulse shape distribution, which is quasi-Gaussian with a well visible peak above the noise level. We measured a 68% variation of the average pulse height between 30 and 500 eV. Furthermore, with a deeper analysis of the pulse shape, and in particular of the correlation between pulse height, area and width, we found a method to discriminate single- and multi- electron events occurring within a 10 ns time window.
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