Search results for "Amination"

Numerical experimental analysis of hybrid double lap aluminum-CFRP joints

2015

Abstract Due to their reliability and ease of assembly, both the adhesively bonded and the mechanical joints are commonly used in different fields of modern industrial design and manufacturing, to joint composite materials or composites with metals. As it is well known, adhesively bonded joints are characterized by high stiffness and good fatigue life, although delamination phenomena localized near the free edges may limit their use, especially for applications where corrosive environments and/or moisture can lead to premature failure of the bonding. In these cases, a possible alternative is given by the well-known mechanical joints. On the contrary, these last joints (bolted, riveted) requ…

Chromogenic detection of nerve agent mimics

2008

The current rise in international concern over criminal terrorist attacks via chemical warfare (CW) agents has resulted in an increasing interest in the detection of these lethal chemicals. Among CW species, nerve agents are extremely dangerous and their high toxicity and ease of production underscore the need to detect these deadly chemicals via quick and reliable procedures. A number of detection systems have been developed, most of them based on enzymatic and physical methodologies. However, these usually show limitations such as low selectivity, lack of portability and a certain complexity in their use. An alternative to these classical methods that has been gaining interest in recent y…

Posterior Shoulder Instability

2020

Posterior shoulder instability is often hard to diagnose with clinical examination. Patients generally present with vague pain, weakness, and/or joint clicking but less frequently complaining of frank sensation of instability. Imaging examinations, especially MR imaging and magnetic resonance arthrography, have a pivotal role in the identification and management of this condition. This review describes the pathologic micro/macrotraumatic magnetic resonance features of posterior shoulder instability as well as the underlying joint abnormalities predisposing to this condition, including developmental anomalies of the glenoid fossa, humeral head, posterior labrum, and capsular and ligamentous …

Thoracic dumbbell spinal chordoma mimicking a schwannoma

2021

Background: Epidural dumbbell-shaped chordomas are localized slow growing, and malignant/aggressive neoplasms. Here, we present a 62-year-old male with a T3-T4 dumbbell-shaped chordoma and reviewed the appropriate literature. Case Description: A 62-year-old male presented with a three-month history of thoracic pain. When the thoracolumbar magnetic resonance (MR) showed a T3-T4 dumbbell-shaped intracanalicular/extradural tumor, he underwent tumor removal. After the histological examination proved the lesion was a spinal chordoma, he underwent a secondary radical transthoracic tumor resection. Postoperatively, the patient was able to walk without assistance, and at 6-month follow-up, was neu…

Hypokalemic rhabdomyolysis associated with Bartter's syndrome.

1983

Severe potassium deficiency is an uncommon cause of rhabdomyolysis. We recently treated a 45-year-old patient with myalgia, serious generalized weakness, increased serum creatine kinase and myoglobin level as well as excessive hypokalemia. Histological examination of deltoid muscle biopsy showed rhabdomyolysis. After complete recovery of muscle damage by potassium substitution Bartter's syndrome proved to be the cause of initial and persistent hypokalemia.

Comparison of oxidoreductive enzyme activities in three coal tar creosote-contaminated soils

2019

This study used laboratory experiments to compare the effects of coal tar creosote on the activity of oxidoreductive enzymes in sandy loam, loamy sand and sandy clay loam soils. Different amounts of coal tar creosote were added to soil samples as follows: 0 (control), 2, 10 or 50 g kg–1 dry matter. The activity of soil dehydrogenases (DHAs), o-diphenol oxidase (o-DPO), catalase (CAT), nitrate reductase (NR) and peroxidases (POX) was determined. Contamination of soil with coal tar creosote affected oxidoreductase activity. Oxidoreductive enzyme activity following soil contamination with coal tar creosote was in the following order: DHAs > CAT > NR > POX > o-DPO in…

Modelling the Electromechanical Impedance Method for the Prediction of the Biomechanical Behavior of Dental Implant Stability

2015

Abstract We propose the electromechanical impedance (EMI) technique to assess the stability of dental implants. The technique consists of bonding a piezoelectric transducer to the element to be monitored. Conventionally, electromechanical admittance is used to diagnose structural damage. In this study, we created a 3D finite element model to mimic a transducer bonded to the abutment of a dental implant placed in a host bone site. We simulated the healing after surgery by changing the Young's modulus of the bone-implant interface. The results show that as the Young's modulus of the interface increases, the electromechanical characteristic of the transducer changes.

Lukiomenestyksen ja yliopisto-opintojen aloitushetken iän yhteys yliopisto-opinnoissa menestymiseen ja opintojen etenemiseen : seurantatutkimus

2018

Tässä tutkimuksessa selvitettiin, missä määrin lukion opintomenestys selittää yliopisto-opinnoissa menestymistä ja opintojen etenemistä. Aineisto muodostui 120:n vuonna 2006 opintonsa aloittaneen liikuntatieteiden tai kielten yliopisto-opiskelijan takautuvista opintotiedoista. Tutkittavista kerättiin lukiosuoritusten arvosanat, ja heidän yliopisto-opintojensa etenemisnopeutta ja suoritustasoa seurattiin vuoteen 2015 saakka. Aineisto analysoitiin korrelaatio- ja regressioanalyyseilla. Regressioanalyysissa selvisi, että tutkittavien lukion päättötodistuksen arvosanojen keskiarvo ja ikä opintojen aloitushetkellä selittivät yliopistossa suoritettujen arvosanojen keskiarvoa. Mitä parempi keskiar…

Practising, testing and assessing oral skills in Finnish upper secondary schools: teachers' opinions

2006

IB upper secondary school and national upper secondary school students' attitudes towards English oral skills : a comparative study

2013

Tämän tutkimuksen tarkoituksena oli kartoittaa suomalaisten lukio-opiskelijoiden asenteita englannin suullista kielitaitoa ja sen testaamista kohtaan. Tietoa kerättiin kyselylomakkeen avulla kahden kaupungin IB-lukioista ja samoissa kouluissa toimivista kansallisista lukioista. Vastaajia oli yhteensä 184. Tutkimuksessa haluttiin selvittää, millaisia asenteita Suomen lukiolaisilla on englannin suullista kielitaitoa kohtaan. Samalla selvitettiin myös opiskelijoiden asenteita suullisen kielitaidon testaamista kohtaan varsinkin kansallisen- ja IB-lukion päättövaiheessa. Tutkimuksen päätavoitteena oli vertailla kansallisten lukiolaisten ja IB-lukiolaisten asenteita toisiinsa. Suullisen kielitaid…