Treatment of transient phenomena in analysis of slag-metal-gas reaction kinetics

Equations commonly used in describing reaction kinetics are examined and the problem of applying such equations to transient processes is discussed. Three examples of transient phenomena are examined in detail. It is shown that for carbon injection into slag, the reaction can be described by employing data for carbon oxidation in CO/CO2 by assuming reaction conditions approximately halfway between those in equilibrium with the slag and those in equilibrium with carbon. It is demonstrated that, when the time averaged interfacial area is employed, the rate of reaction between slag and iron-aluminum alloys can be described by a single first order rate equation, accommodating a 300% change in interfacial area. Creation of surface area in oxygen steelmaking is discussed and a method to determine the size distribution of droplets that are generated is proposed. It is concluded that changes in conditions during reaction complicate the analysis of kinetics. However, it should be possible to develop quantitative kinetic models to describe real processes

Exploring the Antecedents of Happiness: Reconceptualization of Human Needs with Glasser\u27s Choice Theory

This chapter aims to present a review about the antecedents of happiness by using human needs perspective. The chapter briefly includes the definition of happiness as a scientific matter, definition of the need theories approach for explaining the antecedents of happiness, definitions and discussions about the major need theories and reconceptualization of human needs with Glasser’s Choice Theory, and also empirical studies that investigate the relationship between basic needs satisfaction and happiness. It is also thought that the conclusion obtained from this chapter will encourage researchers to investigate the antecedents of happiness with Glasser’s conceptual framework and also invite researchers to study in a new research area with a new conceptual perspective

Development of an Attitude Scale of Mathematics and Science Teachers towards Mistake and Instant Feedback to the Mistake: A Validity and Reliability Study

The purpose of the research is to develop a valid and reliable attitude scale that can measure the attitudes of math and science teachers (315) and teacher candidates (105) towards mistakes and instant feedback. In the validity studies, the exploratory factor analysis was made with the SPS1S 8.0 package program after that the confirmatory factor analysis was made with Lisrel 8.8 software. To develop the scale; 1. Creation of Item Pool 2. Obtaining Expert Opinion, 3. Creation of Pre-Trial Form 4. Factor Analysis is made. According to factor analysis; Kaiser Meyer Olkin (KMO) rate; .808; Bartlett test result: 2148,354; Cronbach alpha reliability coefficient for the whole scale: .829. According to confirmatory factor analysis: Root Mean Square Error of Approximation (RMSEA) .022 (<.05); p-Value for Test of Close Fit .00 (<.05), standardized root mean square residual (SRMR) .014, Goodness of Fit Index (GFI) .75, Adjusted Goodness of Fit Index (AGFI) .69; Normed Fit Index (NFI) .91; Relative Fit Index (RFI) .78; Incremental Fix Index (IFI): .83; Parsimony Goodness of Fit Index (PGFI): .62; Degrees of Freedom: 760; Root Mean Square Residual (RMR): 2.07 and NonNormed Fit Index (NNFI): .88. According to research findings, attitude scale is valid and reliable so it can be used to determine math and science teachers and teacher candidates positive and negative attitudes toward mistake and giving instant feedback to mistake

A rare image phytobezoar in stomach

No Abstract

Coffee bean sign, whirl sign and bird’s beak sign in the diagnosis of sigmoid volvulus

The patient, a 28-year-old man who had presented to our Emergency Department (ED) with constant abdominal pain and distension for one day, had no previous medical or surgical history. He denied that he had any nausea, vomiting, diarrhea or constipation. At admission, his physical examination revealed hypertension (TA: 152/97 mmHg) and a distended abdomen with generalised tenderness and hypoactive bowel sounds. There was no fever, abdominal guarding, rebound or rigidity. Laboratory results were within normal limits. A plain radiograph of the abdomen revealed a “coffee bean” sign. We also observed an impressive picture of a typical “whirl” sign and a “bird’s beak” sign on an emergent abdominal computed tomography (CT) scan. Also, his CT scan revealed marked distension and a twisted loop of sigmoid colon. Sigmoid volvulus (SV) was diagnosed rapidly with these characteristic radiological signs. Subsequently, with flexible sigmoidoscopy, the patient was successfully decompressed and detorsioned. SV is potentially life-threatening and requires emergency intervention. It is the third leading cause of colon obstruction in adults after cancer and diverticulitis. The primary emergency therapy for uncomplicated SV is endoscopic detorsion and decompression. Emergency physicians in particular should be aware of the typical radiographic CT signs, “coffee bean,” “whirl” and “bird’s beak,” which are indicative of SV and which will allow them to easily diagnose this condition in cases of acute abdominal obstruction. If emergency physicians delay diagnosis, the patients might require emergency surgical intervention

A girl with a torticollis without trauma: Grisel’s syndrome

A 7 year-old girl patient was referred from pediatric emergency department (ED) to our emergency department due to cervical pain and neck stiffness. On her physical examination, torticollis was found in the neck. There was no history of trauma. Physical examination showed no focal neurological deficits. On further anamnestic evaluation the patient's parents revealed that she had presented to paediatric ED due to throat and neck pain and put on antibiotics therapy for 5 days. A computed tomography (CT) scan of the patient's neck was performed. A cervical lymphadenopathy associated with atlanto-axial subluxation shadow. The atlas was rotated on one articular process with 3-5 mm anterior displacement, compatible with Type II subluxation. Non-traumatic or inflammatory atlanto-axial subluxation is known as Grisel's syndrome. The subluxation was stabilized with external stabilization (rigid cervical collar). Skeletal muscle relaxants, antibiotics and nonsteroidal anti-inflammatory medications with bed rest were given for further treatment. Early diagnosis of Grisel's syndrome is of crucial importance due to the neurological deficits suc as recurrence or permanent neck deformity. CT, magnetic resonance imaging (MRI) or other imaging tests are required to demonstrate fractures and displaced bone fragments (ie., atlanto-axial subluxation). The primary treatment of early detected Grisel's syndrome is conservative including antibiotic therapy, bed rest, muscle relaxants, external fixation and anti-inflammatory therapy

Is early diagnosis of myofascial pain syndrome possible with the detection of latent trigger points by shear wave elastography?

Purpose: The aim of the study was to investigate the contribution of shear wave elastography to the diagnosis of myofascial pain syndrome (MPS) of the upper part of the trapezius. Material and methods: Ethical committee approval was obtained for the study. Thirty volunteer women with trigger points in the upper part of the trapezius muscle and 30 healthy women with a similar age distribution were included in the study. The patient group performed a self-stretching exercise program for 4 weeks. No intervention was applied to the control group. Muscle stiffness values of both groups were evaluated with shear wave elastography (SWE), and pain levels of all volunteers were evaluated by the Visual Analogue Scale at the beginning and the end of the study. The statistical analyses were performed using SPSS version 18.0. Results: There was a significant decrease after the treatment in terms of upper trapezius muscle stiffness and the pain levels in the patient group (p 0.05). Conclusions: SWE is a reliable method for detecting latent trigger points in MPS, and it can be used for evaluating the response to treatment

A review of the catalytic oxidation of carbon-carbon composite aircraft brakes

This document is the Accepted Manuscript version, made available under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives License CC BY NC-ND 4.0 (http://creativecommons.org/licenses/by-nc-nd/4.0/. The final, definitive version of this paper is available online at doi: https://doi.org/10.1016/j.carbon.2015.08.100.The use of de-icing chemicals at airport runways has been shown to produce oxides and carbonates of sodium, potassium and calcium which catalyse the oxidation of carbon-carbon composite aircraft brakes leading to an increase of the oxidation rate by an order of magnitude. This review reports on studies that have characterised the catalytic oxidation and discusses the mechanism of the catalytic reaction based on investigations that were carried out with both C-C composites and carbon as a fossil fuel. The alkali metal oxides/carbonates are more active catalysts and in their case, the redox reaction between the monoxides and the peroxides has been identified as the most likely catalysis mechanism. In order to reduce or eliminate the problem of catalysis, doping with boron or phosphorus compounds has been investigated by a number of researchers. The effect of these along with the use of protective coatings is also reviewed.Peer reviewe