Utifrån tidigare forskning påvisas att den psykosociala ohälsan inom arbetslivet har ökat. En förklaring till detta kan vara att det mer flexibla arbetslivet gör att arbetstagarens gränser mellan arbete och fritid suddas ut. Arbetsrelaterat överengagemang, work over-commitment (WOC), har vid tidigare studier visats ha en negativ inverkan på den psykosociala arbetsmiljön. Brist på återhämtning är en faktor som oftare nämns i samband med psykosocial ohälsa. Syftet med denna studie är att undersöka samband mellan arbetsrelaterat överengagemang och återhämtning samt om det skiljer sig åt gällande respondenter i privat respektive offentlig verksamhet. Metoden var kvantitativ och genomfördes via en webbenkät. 80 arbetstagare inom offentlig och privat verksamhet bjöds in att deltaga i studien, svarsfrekvens var 51,25%. Resultaten visar att det är små skillnader mellan grupperna avseende hur de skattar såväl arbetsrelaterat överengagemang som återhämtning. Ju mer tid för återhämtning desto lägre inverkan har arbetsrelaterat överengagemang. Korrelationsanalys visar att respondenter som ofta kommer i tidsnöd i sitt arbete och försämrad återhämtning på kort sikt har ett signifikant samband. Även hos respondenter där de närmaste säger att de offrar för mycket för arbetet fanns ett signifikant samband avseende brist på återhämtning efter en natt. / Previous research shows that health problem due to psychosocial health at work has increased. One explanation for this may be that the more flexible labor market means that the worker's boundaries between work and leisure blur. High work commitment, work over-commitment (WOC) has in previous studies been shown to have a negative impact on the psychosocial work environment. Lack of recovery is a factor often mentioned in relation to health problem due to psychosocial health. The aim of this study is to investigate the relationship between work-related overcommitment and recovery, and if there´s a difference between respondents in the private and public sectors. The study was quantitative and web questionnaire was distributed via e-mail. Invitation was send to 80 participants and the response rate was 51.25%. The results show that there are small differences between the groups regarding how they estimate both the work commitment and the recovery. The more time for recovery, the lower impact has work commitment. Correlation analysis shows that respondents who frequent lack of time in their work and increased recovery during short time has a significant correlation. Even among respondents where the relatives say they sacrifice too much for their work was a significant correlation of lack of recovery after one night.

No description available.

El objeto principal de mi tesis es el desarrollo de nuevos complejos polipiridílicos de rutenio, mas concretamente complejos Ru-aguo. Una de las propediades mas interesantes que presentan este tipo de complejos es su capacidad para llevar a cabo un proceso de ”Proton Coupled Electron Transfer”. Este proceso le permite acceder a estados de oxidación elevados. Este es un requisito para ejecutar catálisis redox. Como interesante aplicaciones podemos nombrar la transformación de sulfitos a sulfoxidos (sulfoxidación) y la oxidación de agua a oxígeno molecular. Al principio del manuscrito se presentan complejos mononucleares de rutenio que contienen el ligando DMSO. Los resultados obtenidos respecto la isomerización de enlace están conectados con los resultados obtenidos durante la sulfoxidación utilizando los correspondientes complejos Ru(H2O). El segundo campo de interés esta basado en la oxidación de agua a oxigeno molecular. Una variedad de complejos Ru(H2O) mono- y dinucleares son presentados. Estos se distinguen entre si en sus propiedades estéricas y electrónicas. Estas propiedades están realizadas con su reactividad respeto la oxidación de agua a oxígeno molecular. Los resultados obtenidos permiten tener un mayor conocimiento sobre el mecanismo, formando una base para el futuro desarrollo de nuevos catalizadores para la oxidación de agua. Un punto culminante de esta tesis es la presentación de un sistema capaz de oxidar agua a oxigeno utilizando la irradiación con luz visible. Este sistema consiste en uno de los complejos Ru(H2O) anteriormente descritos, un “photosensitizer” ([Ru(bpy)3]2+) y un aceptor de electrones ([CoCl(NH3)5]2+). Este tipo de reacción juega un papel importante como reacción en el ánodo / The main topic of my thesis is the development of new Ruthenium based polypyridyl complexes, with the focus on Ru-aquo compounds. These Ru-aquo compounds present the interesting property of undergoing proton coupled electron processes. This allows such compounds to reach high oxidation states, which is a requirement in redox catalysis. Applications of interest involve the transformation of sulfites into sulfoxides (sulfoxidation) and the oxidation of water to molecular oxygen (water oxidation). At first different mononuclear ruthenium compounds containing one or two DMSO ligands are presented. The obtained findings concerning S- to O-linkage isomerization are transferred and connected to results from catalysis using Ru(H2O)-compounds as catalysts. The second field of interest concerns water oxidation. A variety of mono- and dinuclear Ru(H2O)-compounds differing in electronic and steric properties are described. These differences are connected to the catalytic activity towards water oxidation reaction. New insights in the underlying reaction mechanisms are provided, which constitute a strong basis for the development of future water oxidation catalysts. One highlight of this thesis is the introduction of mononuclear Ru(H2O)-compounds combined with a [Ru(bpy)3]2+ and a CoIII sacrificial electron acceptor, which successfully produce molecular oxygen upon light irradiation. Light driven water oxidation as anode reaction and the recombination of the electrons and protons from the oxidation process at the cathode form a device called solar fuel cell, that once fully mature may play an important role in a future renewable energy system.

<p>A molecular system capable of photoinduced water splitting is an attractive approach to solar energy conversion. This thesis deals with the functional characterization of molecular building blocks for the three principal functions of such a molecular system: Photoinduced accumulative charge separation, catalytic water oxidation, and catalytic proton reduction. </p><p>Systems combining a ruthenium-trisbipyridine photosensitizer with multi-electron donors in form of dinuclear ruthenium or manganese complexes were investigated in view of the rate constants of electron transfer and excited state quenching. The kinetics were studied in the different oxidation states of the donor unit by combination of electrochemistry and time resolved spectroscopy. The rapid excited state quenching by the multi-electron donors points to the importance of redox intermediates for efficient accumulative photooxidation of the terminal donor.</p><p>The redox behavior of manganese complexes as mimics of the water oxidizing catalyst in the natural photosynthetic reaction center was studied by electrochemical and spectroscopic methods. For a dinuclear manganese complex ligand exchange reactions were studied in view of their importance for the accumulative oxidation of the complex and its reactivity towards water. With the binding of substrate water, multiple oxidation in a narrow potential range and concomitant deprotonation of the bound water it was demonstrated that the manganese complex is capable of mimicking multiple aspects of photosynthetic water oxidation.</p><p>A dinuclear iron complex was investigated as biomimetic proton reduction catalyst. The complex structurally mimics the active site of the iron-only hydrogenase enzyme and was designed to hold a proton on the bridging ligand and a hydride on the iron centers. Thermodynamics and kinetics of the protonation reactions and the electrochemical behavior of the different protonation states were studied in view of their potential catalytic performance.</p>

A molecular system capable of photoinduced water splitting is an attractive approach to solar energy conversion. This thesis deals with the functional characterization of molecular building blocks for the three principal functions of such a molecular system: Photoinduced accumulative charge separation, catalytic water oxidation, and catalytic proton reduction. Systems combining a ruthenium-trisbipyridine photosensitizer with multi-electron donors in form of dinuclear ruthenium or manganese complexes were investigated in view of the rate constants of electron transfer and excited state quenching. The kinetics were studied in the different oxidation states of the donor unit by combination of electrochemistry and time resolved spectroscopy. The rapid excited state quenching by the multi-electron donors points to the importance of redox intermediates for efficient accumulative photooxidation of the terminal donor. The redox behavior of manganese complexes as mimics of the water oxidizing catalyst in the natural photosynthetic reaction center was studied by electrochemical and spectroscopic methods. For a dinuclear manganese complex ligand exchange reactions were studied in view of their importance for the accumulative oxidation of the complex and its reactivity towards water. With the binding of substrate water, multiple oxidation in a narrow potential range and concomitant deprotonation of the bound water it was demonstrated that the manganese complex is capable of mimicking multiple aspects of photosynthetic water oxidation. A dinuclear iron complex was investigated as biomimetic proton reduction catalyst. The complex structurally mimics the active site of the iron-only hydrogenase enzyme and was designed to hold a proton on the bridging ligand and a hydride on the iron centers. Thermodynamics and kinetics of the protonation reactions and the electrochemical behavior of the different protonation states were studied in view of their potential catalytic performance.

No description available.

This thesis is structured as a feminist creative endeavour, a practice of self-love that aims at exploring (my) depression as a cultural and social phenomenon caused mainly by an inability to correctly embody swedishness, a constant haunting of a colonial and Colombian past, and the affective dimensions of language. This text is based on autoethnographic material about the experiences of being a Colombian-born migrant in Sweden and uses mainly affect theory and decolonial theory to make sense of these experiences. The thesis showcases my temporal relation to both swedishness and colombianness and how that dimension influences the (re)production of my self, and the consequent “negative feelings” linked to depression I experience. Furthermore, as a creative endeavour following the tradition of WOC feminist writers, this thesis highlights how writing and theorizing can lead to healing.

<p dir="ltr">Insights from research into the natural photosynthetic processes are applied to inform the rational design of inorganic catalysts. The study of these synthetic systems – artificial photosynthesis – will lead towards the development of a device able to absorb light, convert and store the energy in the form of chemical bonds. The water-splitting reaction, a bottleneck of the photosynthetic process, is a key barrier to overcome in this endeavor. Thus, the focused study of water-oxidation catalysts able to facilitate this difficult reaction is performed, in order to develop a green-energy solution in the form of an artificial photosynthesis system.</p>