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Rapid evaluation of notch stress intensity factors using the peak stress method with 3D tetrahedral finite element models: Comparison of commercial c…
2022
The peak stress method (PSM) allows a rapid application of the notch stress intensity factor (NSIF) approach to the fatigue life assessment of welded structures, by employing the linear elastic peak stresses evaluated by FE analyses with coarse meshes. Because of the widespread adoption of 3D modeling of large and complex structures in the industry, the PSM has recently been boosted by including four-node and ten-node tetrahedral elements of Ansys FE software, which allows to discretize complex geometries. In this paper, a Round Robin among eleven Italian Universities has been performed to calibrate the PSM with seven different commercial FE software packages. Several 3D mode I, II and III …
Kulinaria w przestrzeni miasta : nowe trendy, nowe potrzeby mieszkańców
2015
The subject of this article is culinary trends observable in Polish cities during the past few years. They include both the rediscovered practices, directly related to the cultural (culinary) heritage of a particular area, and these which have become popular only recently. According to the author, characteristic culinary fads are: the promotion of local delicacies on a large scale, growing interest in shopping in farmers’ markets offering organic produce (bio-markets) and traditional goods, growing popularity of street food (including street food festivals and picnics), and organizing the so called “breakfast on the grass” events.
(H,ρ)-induced dynamics and large time behaviors
2018
In some recent papers, the so called (H,ρ)-induced dynamics of a system S whose time evolution is deduced adopting an operatorial approach, borrowed in part from quantum mechanics, has been introduced. Here, H is the Hamiltonian for S, while ρ is a certain rule applied periodically (or not) on S. The analysis carried on throughout this paper shows that, replacing the Heisenberg dynamics with the (H,ρ)-induced one, we obtain a simple, and somehow natural, way to prove that some relevant dynamical variables of S may converge, for large t, to certain asymptotic values. This cannot be so, for finite dimensional systems, if no rule is considered. In this case, in fact, any Heisenberg dynamics im…
N-attiecības ietekme uz izdzīvotību pacientiem ar kuņģa vēzi pēc gastrektomijām ar paplašinātām limfadenektomijām
2021
Ievads: N-attiecība ir prognostisks rīks, kas spēj samazināt TNM stadijas uzliktās stadijas migrāciju. Atbilstoši N-attiecība spētu papildināt esošo TNM klasifikācijas sistēmu tādējādi būtu iespējams samazināt nepareizas stadijas uzlikšanu. Darba mērķis: Izpētīt limfmezglu attiecības ietekmi uz izdzīvotību pacientiem ar kuņģa vēzi pēc gastrektomijām ar paplašinātām limfadenektomijām. Darba uzdevumi: Iepazīties ar jaunāko literatūtu, ievākt pacientu datus no 2014 - 2015 gada, apkopot klīniski-patoloģiskos faktorus veikt šo faktoru analīzi un veikt secinājumus. Rezultāti: Pētījums rāda, ka N-attiecības un pN rādītāja 5 gadu izdzīvotība ir līdzvērtīga. Tika konstatēts, ka N-attiecība ir progno…
The Greenland shark Somniosus microcephalus—Hemoglobins and ligand-binding properties
2017
A large amount of data is currently available on the adaptive mechanisms of polar bony fish hemoglobins, but structural information on those of cartilaginous species is scarce. This study presents the first characterisation of the hemoglobin system of one of the longest-living vertebrate species (392 +/- 120 years), the Arctic shark Somniosus microcephalus. Three major hemoglobins are found in its red blood cells and are made of two copies of the same a globin combined with two copies of three very similar beta subunits. The three hemoglobins show very similar oxygenation and carbonylation properties, which are unaffected by urea, a very important compound in marine elasmobranch physiology.…
Datu modeļa redaktora optimizācija
2016
Šajā dokumentā ir aprakstīts kvalifikācijas darbs „Datu modeļa redaktora optimizācija”. Datu modeļa redaktors ir rīks, kas tiek izmantots auto un mājokļu apdrošināšanas polišu tirdzniecības sistēmas Alfa izstrādē. Datu modeļa redaktora rīks izmantoja novecojušas javascript bibliotēkas un ielādēja visus struktūras elementus vienlaicīgi. Šī darba mērķis bija samazināt datu modeļa redaktora ielādes laiku. Mērķis tika sasniegts, izmantojot asinhronu datu ielādi – lietotājs ielādē elementus tikai tad, kad tie ir nepieciešami. Datu modeļa redaktors tika papildināts ar jaunu funkcionalitāti, kas atvieglo tā lietotāju darbu.
A Thermodynamically Consistent CZM for Low-Cycle Fatigue Analysis
2018
A cohesive zone model for low-cycle fatigue analysis is developed in a consistent thermodynamic framework of elastic-plastic-damage mechanics with internal variable. A specific fatigue activation condition allows to model the material degradation related to the elastic-plastic cyclic loading conditions, with tractions levels lower than the damage activation condition. A moving endurance surface, in the classic framework of kinematic hardening, enables a pure elastic behavior without any fatigue degradation for low levels loading conditions.
Partial discharges behavior under different rectified waveforms
2017
In this work, a previous software used to simulate partial discharges (PDs) under Alternating Current (AC) stress has been modified in order to evaluate the PDs behavior under a voltage stress close to the Direct Current (DC) waveform. By using a full-wave and a half-wave rectifier, the specimen with an air void defects has been subjected to a gradual constant stress. Finally, a capacitive filter has been inserted in order to produce a steadier voltage supply. Simulation results show that under an almost DC waveform, the PDs activity become less compared to AC stress.
Experimental Equipment for Studying the Residual Stresses Developed During High Temperature Reactions by X-Ray Diffraction
1996
This paper describes a device dedicated to studyng, by X-ray diffraction the residual stresses developed on surface samples as a function of temperature and atmosphere conditions. The setup consists of : a.) an horizontal axis goniometer which allows the programmed positionning of the sealed X-ray source and of the linear detector. b.) a high temperature controlled atmosphere chamber Particular attention has been paid to the thermal stability up to 1200°C and the accurate position on the sample.
Strategies for numerical simulation of linear friction welding of metals: a review
2017
Linear friction welding (LFW) is a solid-state joining process used to weld non-axisymmetric components. Material joining is obtained through the reciprocating motion of two specimens undergoing an axial force. During this process, the heat source is determined by the frictional work transformed into heat. This results in a local softening of the material and plays a key role in the onset of the bonding conditions. In this paper, a critical analysis of the different approaches used to simulate the LFW processes is provided. The focus of the paper is the comparison of different modeling strategies and the most relevant outputs available, i.e. temperature, strain and stress distribution, mate…