Search results for "Envelope"
showing 10 items of 336 documents
Nonstationary response envelope probability densities of nonlinear oscillators
2006
The nonstationary random response of a class of lightly damped nonlinear oscillators subjected to Gaussian white noise is considered. An approximate analytical method for determining the response envelope statistics is presented. Within the framework of stochastic averaging, the procedure relies on the Markovian modeling of the response envelope process through the definition of an equivalent linear system with response-dependent parameters. An approximate solution of the associated Fokker-Planck equation is derived by resorting to a Galerkin scheme. Specifically, the nonstationary probability density function of the response envelope is expressed as the sum of a time-dependent Rayleigh dis…
Signal sequences modulate the immunogenic performance of human hepatitis C virus E2 gene
2005
Abstract Envelope protein E2 of human hepatitis C virus (HCV) is an attractive component of a prototype HCV vaccine. Delivered by DNA immunogens, E2 evokes specific immune response of Th1-type, failing to induce either considerable antibody production, or T-helper cell proliferation. We aimed at modulating the immunogenic performance of E2 gene by changing the mode of protein expression in eukaryotic cells. Plasmids were constructed encoding full-length E2 and nonstructural protein 1 (p7) fused to either 13 or 38 C-terminal amino acids (aa) of HCV E1 that contain second hydrophobic segment of E1 stop-transfer signal, or a complete E1 stop-transfer signal with duplicated second hydrophobic s…
Weakly nonlinear analysis of Turing patterns in a morphochemical model for metal growth
2015
We focus on the morphochemical reaction–diffusion model introduced in Bozzini et al. (2013) and carry out a nonlinear bifurcation analysis with the aim to characterize the shape and the amplitude of the patterns arising as the result of Turing instability of the physically relevant equilibrium. We perform a weakly nonlinear multiple scales analysis, and derive the normal form equations governing the amplitude of the patterns. These amplitude equations allow us to construct relevant solutions of the model equations and reveal the presence of multiple branches of stable solutions arising as the result of subcritical bifurcations. Hysteretic type phenomena are highlighted also through numerica…
<title>Luminescence of intrinsic defects in LiBaF<formula><inf><roman>3</roman></inf></formula></title&g…
2003
A wide emission band in the region of 425 nm is observed in all the examined crystals at photo and ionising irradiation. Maximum of the complex luminescence band is observed at 410 nm at 350 K and at 450 nm at 85 K. The shift of the peak of the band envelope towards shorter wavelengths as the temperature increases is related to thermal dependence of the intensity of elementary components of the luminescence band. The authors suggest that the complex luminescence band arises from electronic excitations at "antisite" defects, i.e., defects caused by stoichiometric deviations, when a portion of Li+ cations (cations of one type of the LiBaF3 crystal lattice) occupy sites of Ba2+ cations (cation…
Evaluation of building heating loads with dimensional analysis: Application of the Buckingham π theorem
2017
Abstract A detailed assessment of building energy performance requires a large amount of input data concerning building typology, environmental conditions, envelope thermophysical properties, geometry, control strategies, and several other parameters. Notwithstanding, the use of specialized software tools poses many challenges in regards to the retrieval of reliable and detailed information, setting a steep learning curve for engineers and energy managers. To speed up the preliminary assessment phase, it might be more convenient to resort to a simplified model that allows the evaluation of heating energy demand with a good level of accuracy and without excessive computational cost or user e…
Cytoplasmic Parvovirus Capsids Recruit Importin Beta for Nuclear Delivery
2019
Parvoviruses are an important platform for gene and cancer therapy. Their cell entry and the following steps, including nuclear import, are inefficient, limiting their use in therapeutic applications. Two models exist on parvoviral nuclear entry: the classical import of the viral capsid using nuclear transport receptors of the importin (karyopherin) family or the direct attachment of the capsid to the nuclear pore complex leading to the local disintegration of the nuclear envelope. Here, by laser scanning confocal microscopy and in situ proximity ligation analyses combined with coimmunoprecipitation, we show that infection requires importin β-mediated access to the nuclear pore complex and …
Cell Envelopes of Methanogens
2010
Methanogens play an important role in the global carbon cycle, because they are involved in the last step of anaerobic degradation of organic material to methane. Although the first report on methane emanation from aquatic muds was given by Alessandro Volta in the year 1776, the first methanogen was not obtained in pure culture before 1947. Special culture techniques had to be developed for growing the strict anaerobic methanogenic isolates. The methanogens were the first species of the archaeal domain (Archaea) detected. Their unique biochemical and genetic properties have stimulated basic investigations of this microbial group in the last three decades. The methanogenic Archaea possess a …
Technological and behavioral aspects of perforated building envelope in the Mediterranean region
2015
Perforated building envelope presents a global contemporary architectural trend which is connected – in some circumstances – to the traditional perforated models, such as ‘Mashrabiyya’, ‘Takhtabush’, ‘Qmariyyah’, etc. This study focuses on perforated models that have archetypical perforated elements within buildings and have technological and behavioural functions reflecting socio-cultural values, economic situation, and environmental needs of the building’s users. An analytical comparison (technologically and behaviourally) has been conducted between the selected contemporary cases of perforated buildings and the traditional models, by considering various aspects of the building’s envelope…
The role of technological culture in the theoretical dichotomy between technique and form/Il ruolo della cultura tecnologica nella dicotomia teorica …
2017
La cultura tecnologica spiega il rapporto tra forma e tecnica basandosi su una dimensione concreta ed esistenziale. «La dimensione esistenziale “verità” si manifesta attraverso la storia, ma il suo significato trascende la situazione storica. Tale concretizzazione dipende in genere dal come siano le cose fatte, ossia dalle forme e dalla tecnologia» (Schulz, 1979). In tal ottica il saggio esplora teorie e prassi della cultura tecnologica sul rapporto tra materia e forma e tra architettura e tecnica, a partire dal concetto di tecnologia: dall’evoluzione storica delle tecniche e dei sistemi costruttivi al valore dell’innovazione, sondando nelle problematiche ideologiche, sociali e materiali ch…