Evaluation of Seismic Soil-Structure Interaction (SSI) by Different Approaches

The paper investigates the seismic SSI effects for rigid type structures. Structural response is computed by modal synthesis versus frequency response approach. The main aspects analysed are as follows: a) the seismic SSI effects on structural response; b) shortcomings in the current SSI computational procedure; c) seismic structure –soil-structure interaction (SSSI) effects on structural response of neighbouring heavy buildings. Two case studies are presented: a shearwell multistory building (SMB) on soft clay and a massive reactor building (RB). Seismic response quantities are accelerations, displacements, stresses, floor response spectra (FRS) and spectra amplification functions (SAF)

Vanishing Waves on Closed Intervals and Propagating Short-Range Phenomena

This study presents mathematical aspects of wave equation considered on closed space intervals. It is shown that a solution of this equation can be represented by a certain superposition of traveling waves with null values for the amplitude and for the time derivatives of the resulting wave in the endpoints of this interval. Supplementary aspects connected with the possible existence of initial conditions for a secondorder differential system describing the amplitude of these localized oscillations are also studied, and requirements necessary for establishing a certain propagation direction for the wave (rejecting the possibility of reverse radiation) are also presented. Then it is shown that these aspects can be extended to a set of adjacent closed space intervals, by considering that a certain traveling wave propagating from an endpoint to the other can be defined on each space interval and a specific mathematical law (which can be approximated by a differential equation) describes the amplitude of these localized traveling waves as related to the space coordinates corresponding to the middle point of the interval. Using specific differential equations, it is shown that the existence of such propagating law for the amplitude of localized oscillations can generate periodical patterns and can explain fracture phenomena inside materials as well

Measure transformation and efficient quadrature in reduced-dimensional stochastic modeling of coupled problems

Coupled problems with various combinations of multiple physics, scales, and domains are found in numerous areas of science and engineering. A key challenge in the formulation and implementation of corresponding coupled numerical models is to facilitate the communication of information across physics, scale, and domain interfaces, as well as between the iterations of solvers used for response computations. In a probabilistic context, any information that is to be communicated between subproblems or iterations should be characterized by an appropriate probabilistic representation. Although the number of sources of uncertainty can be expected to be large in most coupled problems, our contention is that exchanged probabilistic information often resides in a considerably lower dimensional space than the sources themselves. In this work, we thus use a dimension-reduction technique for obtaining the representation of the exchanged information. The main subject of this work is the investigation of a measure-transformation technique that allows implementations to exploit this dimension reduction to achieve computational gains. The effectiveness of the proposed dimension-reduction and measure-transformation methodology is demonstrated through a multiphysics problem relevant to nuclear engineering

Simulation of the Behavior of 32-Layer Composite Plate for Ballistic Protection

This paper presents experimental results and a failure analysis of a composite for ballistic protection. The stratified plate is manufactured at laboratory scale, after a technology designed by the authors. The plates were tested for level FB2, taking into account the standard SR EN 1522:2004 (Windows, doors, shutters and blinds. Bullet resistance. Requirements and classification) and SR EN 1523:2004 (Windows, doors, shutters and blinds. Bullet resistance. Test method) and the results point out that this plate could face more dangerous threats. In order to evaluate the behavior of the plate under the impact characterizing a higher level of threat, the authors uses a FE model and simulated the system bullet – plate for different impact velocities

Management of pelvic pain caused by endometriosis

Endometriosis is a disorder of the epithelium and/or endometrial-like stroma outside the endometrium and myometrium, usually with an associated inflammatory process. It mainly affects young women of reproductive age, the prevalence being estimated at approximately 10%. Due to the varied clinical symptoms marked by chronic pelvic pain, dysmenorrhea, infertility, dyspareunia, dysuria, endometriosis requires a complex treatment. Endometriosis is a major health problem with socioeconomic impact, which is why many gynecological societies have published different guidelines to assist clinicians in the diagnosis and treatment of endometriosis. The variety of available treatments combined with the complexity of this disease leads to significant discrepancies between recommendations. The most used is the ESHRE guidelines published in 2022, which represents an update of the ESHRE guidelines on endometriosis published in 2013 and 2005 regarding the diagnosis and treatment of endometriosis. The purpose of this review is to provide an overview of endometriosis treatment methods after comparing several widely used guidelines in endometriosis management

The Journal of Microelectronic Research

https://scholarworks.rit.edu/meec_archive/1015/thumbnail.jp

AFFINOID SUBDOMAINS AS COMPLETIONS OF AFFINE SUBDOMAINS

By following an idea of Nicolae Popescu, we construct affinoid subdomains as the completion of affine subdomains