Search results for "Experimental"

Maxillary first molar with three mesiobuccal canals confirmed with spiral computer tomography

2012

Anatomic variations in root canal morphology have become easier to detect with the rapid advancements in clinical and diagnostic aids. Also an increased awareness of unusual anatomic morphology and a better understanding of the root canal system guides the clinician in diagnosis and treatment of such variations in order to achieve a successful endodontic outcome. Mesiobuccal root of first maxillary molar teeth have been considered to be one of the most complex and challenging root canal systems. This case report presents a successful management of a third canal in the mesiobuccal root of permanent maxillary first molar using dental operating microscope along with a modified access preparati…

Divergent Thinking in Older Adults : Understanding its Role in Well-being

2021

The purpose of the study was to explore the nature of the relationship between Divergent Thinking and Well-being. Two theoretical models about the relationship between Divergent thinking, Psychological well-being and Life Satisfaction were tested. A total of 152 subjects between 65 and 84 years old participated in the study. Final model emphasises the idea that PWB is affected by DT and that PWB is also significantly related to LS. The model also highlights the importance of four dimensions of well-being: environmental mastery, life purpose, personal growth and self-acceptance. The goodness-of-fit indexes confirmed the existence of a significant relationship between DT and well-being, and b…

Contribution of Woldemar von Knieriem to the Training and Experimental Farm «Peterhof» of Riga Polytechnicum and Riga Polytechnic Institute

2019

The article is dedicated to Professor Woldemar von Knieriem (1849– 1935), who has made a significant contribution to the development of agricultural science, headed the Department of Agriculture of Riga Polytechnic Institute (1903–1906), as well as Training and Experimental Farm «Peterhof» (1880– 1915) near Olaine city. It became a model farm not only in the Baltic region but also throughout the Russian Empire. Professor W. von Knieriem was the Director of RPI (1906–1916), an outstanding organizer and author of scientific works. He provided students with extensive theoretical and practical knowledge in agriculture, focusing on practical, scientifically approbated lessons about the managemen…

Establishing standards for neuronavigated TMS in research and clinical studies

2016

Multifocal TMS for temporo-spatial description of cortico-cortical connectivity patterns

2016

Short clinical crowns (SCC) ' treatment considerations and techniques

2012

When the clinical crowns of teeth are dimensionally inadequate, esthetically and biologically acceptable restoration of these dental units is difficult. Often an acceptable restoration cannot be accomplished without first surgically increasing the length of the existing clinical crowns; therefore, successful management requires an understanding of both the dental and periodontal parameters of treatment. The complications presented by teeth with short clinical crowns demand a comprehensive treatment plan and proper sequencing of therapy to ensure a satisfactory result. Visualization of the desired result is a prerequisite of successful therapy. This review examines the periodontal and restor…

Second Language Interference during First Language Processing by Arabic-English Bilinguals.

2017

The research investigated whether a bilinguals’ second language (L2) is activated during a task involving only the first language (L1). We tested the hypothesis that the amount of L2 interference can vary across settings, with less interference occurring in testing locations where L2 is rarely used. In Experiment 1, we compared language processing for 50 Arabic–English bilinguals tested in Saudi Arabia and 49 Arabic–English tested in the United States. In the task, participants viewed a picture and judged whether a phoneme presented over headphones was part of the L1 picture name. The results showed no effect of testing location on processing. For both groups of bilinguals, we observed L2 i…

Slide electrification: charging of surfaces by moving water drops.

2019

We investigate the charge separation caused by the motion of a water drop across a hydrophobic, insulating solid surface. Although the phenomenon of liquid charging has been consistently reported, these reports are primarily observational, results are difficult to reproduce, and no quantitative theory has been developed. In this work, we address both the experimental and theoretical sides of this problem. We reproducibly measure the charge gained by water drops sliding down a substrate, and we outline an analytical theory to describe this charging process. As an experimental system, we choose water drops moving down an inclined plane of glass hydrophobized with perfluoro octadecyltrichloros…

Reinforcement Efficiency of Cellulose Microfibers for the Tensile Stiffness and Strength of Rigid Low-Density Polyurethane Foams

2020

Rigid low-density closed-cell polyurethane (PU) foams are widely used in both thermal insulation and structural applications. The sustainability of PU foam production can be increased by using bio-based components and fillers that ensure both enhanced mechanical properties and higher renewable material content. Such bio-based foams were produced using polyols derived from rapeseed oil and microcrystalline cellulose (MCC) fibers as filler. The effect of MCC fiber loading of up to 10 wt % on the morphology, tensile stiffness, and strength of foams has been evaluated. For estimation of the mechanical reinforcement efficiency of foams, a model allowing for the partial alignment of filler fibers…

Experimental analysis of "bovedas tabicadas"

2012

A particular type of vaulted structures, known as bóvedas tabicadas (Catalan vaults), made with alternate layers of bricks and mortar and characterized by a very low thickness in comparison to the other two dimensions, are studied. The research has been faced under the historical aspect as well as under the mechanical one, developing experimental and numerical analysis regarding real existing structures. In particular, the experimental analysis, performed by effecting compression and bending tests on samples taken from a real structure, has been devoted to the constitutive material identification and the characterization is made by considering the material as an ideal homogeneous; further e…