Search results for " support"
showing 10 items of 1591 documents
Oxidative dehydrogenation of ethane: A study over the structure and robustness of Ni–W–O catalysts
2014
[EN] The robustness of one selected Ni-W-O catalyst has been studied in the oxidative dehydrogenation of ethane. This catalyst initially deactivates for the first 10 h online decreasing 15% of its catalytic activity compared to its initial stable catalytic activity. However from 10 to 60 h online the catalytic activity keeps almost stable. On the other hand, it has been shown that the Ni-W-O catalyst cannot tolerate an oxygen-free atmosphere (C-2 and He) as nickel oxide is transformed into metallic nickel. Methane and hydrogen as well as abundant coke were formed on the surface of the catalyst in these O-free conditions. However a re-calcination in air leads to the removal of coke, the cata…
Nature of cobalt active species in hydrodesulfurization catalysis: combined support and preparation method effects
2007
Abstract Co/γ-Al2O3, Co/SiO2, Co/MCM-41, Co/ASA and Co/S2 (amorphous aluminosilicate with Al/Si = 0.13 and with Al/Si ≈ 2, respectively) were prepared by the method of wet impregnation and by the method of precipitation in the presence of sodium carbonate. The samples were characterised by XPS, XRD and TPR. The catalytic activity was tested in the hydrodesulfurization of thiophene using a continuous flow reactor. Among the wet impregnated catalysts those supported on the amorphous and ordered mesoporous silica exhibited higher HDS activity as compared to the alumina containing supports. Particularly, the use of the mesoporous, high surface area MCM-41 support, determined the best performing…
Angioedema Coexisting Chronic Spontaneous Urticaria Negatively Influences Patients’ Sense of Coherence, What Results in Susceptibility to Anxiety Sym…
2021
Background: Angioedema coexisting chronic spontaneous urticaria (CSU) is proved to result in patient anxiety occurrence, but the mechanisms and susceptibility patterns are unknown. Sense of coherence (SOC) is one of methods of coping with stress and is defined as a person’s general orientation toward life. We decided to assess SOC disturbances in CSU patients in the context of possible angioedema association. Methods: The study comprised 71 CSU subjects. To analyze disease activity, the Urticaria Activity Score seven-day assessment questionnaire (UAS7) was used. For anxiety assessment, the STAI questionnaire was used. The SOC-29 questionnaire, consisting of questions related to comprehensib…
Total oxidation of naphthalene using bulk manganese oxide catalysts
2013
Several Mn2O3 catalysts have been synthesized using different preparation methods and tested for the total oxidation of naphthalene, a model polycyclic aromatic compound. The catalysts have been characterized by several physico-chemical techniques such as XRD, TPR, XPS, EDX and TEM. The surface area of the catalyst seems to be of paramount importance, since the mass normalized activity of catalysts increases as the surface area of the Mn2O3 catalysts increases. Consequently, a high surface area ordered mesoporous Mn2O3 catalyst, obtained through a nanocasting route using mesoporous KIT-6 silica as a hard template, was the most efficient catalyst for the deep oxidation of naphthalene. In add…
Hume’s Guillotine in Designing Ethically Intelligent Technologies
2020
Intelligent machines can follow ethical rules in their behaviour. However, it is less clear whether intelligent systems can also create new ethical principles. The former position can be called weak ethical AI and the latter strong ethical AI. Hume’s guillotine which claims that one cannot derive values from facts appears to be a fundamental obstacle to strong ethical AI. The analysis of human ethical information processes provides clarity to the possibility of strong ethical AI. Human ethical information processing begins with positive of negative emotions associated to situations. Situations can be seen as consequences of actions and for this reason people can define rules about acceptabi…
La sostenibilità della coppia mista fra familiare e sociale
2013
La ricerca analizza sia i processi macrosociali, riferiti alla comunità, sia i processi micro, propri della dinamica di coppia. Per i primi abbiamo esaminato la percezione di diversità che può scaturire dalle dinamiche intergruppali e l’identità di luogo (intesa come radicamento nel nuovo contesto di accoglienza); per le dinamiche di coppia si sono prese in esame l’impatto che la presenza dei figli genera sulla dinamica di coppia e gli stili educativi adottati. Coerentemente con il metodo d’indagine della ricerca qualitativa, sono state intervistate 22 coppie miste residenti in Sicilia. Il contenuto emerso è stato analizzato con l’ausilio del software Atlas.ti. Tra gli aspetti più salienti …
A Self determination theory based exercise intervention in a group of adult exercisers : a contextual evaluation
2010
ABSTRACT Karoline Kaminski. 2010. A Self-Determination Theory Based Exercise Intervention in a Group of Adult Exercisers; a Contextual Evaluation. University of Jyväskylä. Department of Sport Sciences, Master’s thesis in Sport and Exercise Psychology, 71 pages. According to the Self-determination theory, when the social context is autonomy supportive, people are motivated to internalize the regulation of important activities, and whereas when the context is controlling, self-determined motivation is undermined. Exercise is one of those important activities which when internalized would result in persistent engagement leading people to positive psychological and physiological outcomes (impro…
Effects of a computerized decision support system on care planning for pressure ulcers and malnutrition in nursing homes: an intervention study.
2013
Author's accepted version (post-print). Background: Nursing documentation is essential for facilitating the flow of information to guarantee continuity, quality and safety in care. High-quality nursing documentation is frequently lacking; the implementation of computerized decision support systems is expected to improve clinical practice and nursing documentation. Aim: The present study aimed at investigate the effects of a computerized decision support system and an educational program as intervention strategies for improved nursing documentation practice on pressure ulcers and malnutrition in nursing homes. Design, setting and participants: An intervention study with two intervention grou…
Narratives of Spousal Support for the Careers of Men in Managerial Posts
2016
This article analyses the narratives of men managers to see how they perceive their wives' support in relation to their careers. Our aim is to focus on different forms of spousal support and explore how the support can evolve in the course of the men's careers. We are also interested in what kind of gender relations men produce when narrating their experiences of spousal support for their career. The research material comprises interviews with 29 managers who are fathers. In contrast to many previous studies, the results here suggest that spousal support is not a fixed or uncomplicated phenomenon but is constructed as various and flexible by men: negotiated , enriching and declining. The na…
Testing a physical education-delivered autonomy supportive intervention to promote leisure-time physical activity in lower secondary school students:…
2020
© 2020 The Author(s). Background: Inadequate physical activity in young people is associated with several physical and mental health concerns. Physical education (PE) is a potentially viable existing network for promoting physical activity in this population. However, little research has been conducted on whether PE teachers can influence students' engagement in leisure-time physical activity. The present study therefore examined the efficacy of an intervention aimed at increasing PE teachers' autonomy support on students' leisure-time physical activity (the PETALS trial). The intervention was guided by the trans-contextual model (TCM) explaining the processes by which PE teachers' provisio…