This is a habilitation thesis submitted to and accepted by the council of the faculty of life sciences at the Humboldt-Universität zu Berlin, Berlin, Germany. The thesis is written in English, but some formal parts (e.g., on the title page) and acknowledgements are written in German language. / Die Research-Domain-Criteria-Initiative und andere haben vorgeschlagen, zur Konzeption psychischer Störungen dimensionale psychologische Konstrukte zu verwenden. Die vorliegende Arbeit beschreibt mehrere Experimente, in denen mit Augenbewegungsaufgaben das Konstrukt der kognitiven Kontrolle evaluiert wurde. Die Studien sollten klären, welche kognitiven und neuronalen Mechanismen zu den bei Menschen mit Schizophrenie oder Zwangsstörung erhöhten Latenzen volitionaler Sakkaden beitragen. In drei Studien wurden Anforderungen der Antisakkadenaufgabe isoliert und funktionelle Magnetresonanztomographie angewendet. Die Ergebnisse legen nahe, dass die verlangsamte volitionale Sakkadengenerierung bei Schizophrenie durch eine dysfunktionale Aktivierung des lateralen präfrontalen Cortex und der supplementären Augenfelder vermittelt wird, was mit Defiziten in der proaktiven Handlungskontrolle verbunden sein könnte. Fünf weitere Experimente sollten Teilprozesse aufklären und haben gezeigt, dass die Defizite möglicherweise aus einer Beeinträchtigung der volitionalen Loslösung der Fixation und der motorischen Vorbereitung resultieren. Zwei weitere Studien legen nahe, dass auch die Zwangsstörung mit erhöhten Latenzen volitionaler Sakkaden assoziiert ist. Effekte experimenteller Variation haben jedoch gezeigt, dass diesen Defiziten wahrscheinlich eine Verlangsamung der Reaktionsauswahl zugrundeliegt. Die bei beiden Patientengruppen vermutlich betroffenen Mechanismen dienen zielgerichteten Verhaltensweisen. Man kann vermuten, dass die Defizite eine Störung auf der Ebene eines allgemeinen Faktors exekutiver Funktionen widerspiegeln. Die experimentellen Ergebnisse weisen jedoch auch auf störungsspezifische Funktionsbeeinträchtigungen hin. Zukünftige Forschung muss den Zusammenhang zwischen diesen Beeinträchtigungen und Symptomen besser aufzuklären, wenn Konzepte psychischer Störungen, die auf experimentell definierten psychologischen Konstrukten basieren, am Ende erfolgreich sein sollen. / The research domain criteria initiative and others have suggested to conzeptualize mental disorders on the basis of dimensional psychological constructs. The present work describes several experiments using eye movement tasks to evaluate the construct of cognitive control. The studies aimed at uncovering cognitive and neural mechanisms involved in increased latencies of volitional saccades as found in individuals with schizophrenia or obsessive-compulsive disorder. Three studies used functional magnetic resonance imaging and isolated different demands of the antisaccade task. The results suggest that slowed volitional saccade generation in schizophrenia is mediated by dysfunctional activation of the lateral prefrontal cortex and the supplementary eye fields, which may relate to deficits in proactive control of action. Five additional behavioral experiments aimed at specifying sub-processes and showed that the deficits might result from impairments in volitional fixation disengagement and motor preparation. Two studies in individuals with obsessive-compulsive disorder suggest that this disorder is also associated with increased latencies of volitional saccades. However, experimental variation revealed that these deficits may reflect a slowing in response selection. The mechanisms affected in both groups are serving goal-directed behaviors and may reflect a disturbance on the level of a common executive functions factor. However, the experimental results also suggest disorder specific functional impairment. Future research will have to improve our understanding of the relationship between these impairments and symptoms if concepts based on experimentally defined psychological constructs shall be successful in the end.

Die Posttraumatische Belastungsstörung (PTBS) nach sexueller Gewalt in der Kindheit geht häufig mit komorbiden Symptomen einher. Kognitiv-behaviorale Therapien haben sich als effektiv in der Behandlung der PTBS erwiesen. Die Datenlage zur PTBS nach sexueller Gewalt in der Kindheit ist jedoch gering. In der vorliegenden Dissertation wurden Fragestellungen zur Diagnostik und Therapie der PTBS nach sexueller Gewalt verfolgt. In Schrift 1 werden die Ergebnisse einer ambulanten Assessmentstudie präsentiert, in der 28 Patientinnen wiederholt zum intrusiven Wiederleben befragt wurden. Mit durchschnittlich 75 Intrusionen und 24 Flashbacks pro Woche fand sich eine hohe Symptombelastung. Die Schriften 2, 3 und 4 beziehen sich auf eine randomisiert-kontrollierte Studie. Patientinnen (N=74) wurden randomsiert einer 12-wöchigen stationären DBT-PTBS oder einer treatment-as-usual Warteliste zugewiesen. Die Ergebnisse, die in Schrift 2 beschrieben sind, zeigen eine signifikante Reduktion der posttraumatischen Symptomatik mit einer großen Zwischengruppen-Effektstärke (g=1.35). In Schrift 3 wird dargestellt, dass die Effekte auf die posttraumatische Symptomatik in Bezug auf mehrere traumatische Ereignisse geringer sind als die Effekte in Bezug auf das am stärksten belastende Ereignis. Schrift 4 beinhaltet Ergebnisse zu der Inanspruchnahme psychiatrisch-psychotherapeutischer Behandlung und den assoziierten Kosten. Im Jahr vor der DBT-PTBS fanden sich im Mittel jährliche Pro-Kopf-Kosten von  18100 € und 57 stationäre Tage. Im Jahr nach der DBT-PTBS waren die Inanspruchnahme mit durchschnittlich 14 Tagen und die mittleren Kosten von 7233 € deutlich geringer. Zusammengefasst sprechen die Ergebnisse für eine hohe Effektivität der DBT-PTBS. Zudem scheint die DBT-PTBS mit einer Reduktion stationärer Tage und entsprechender Kosten einherzugehen. Die Ergebnisse zur Diagnostik deuten darauf hin, dass ein Teil der Symptomatik mit dem üblichen diagnostischen Vorgehen nicht erfasst wird. / Posttraumatic stress disorder (PTSD) with co-occurring severe psychopathology is a frequent sequel of childhood sexual abuse (CSA). Cognitive-behavioral therapy has been shown to be efficacious in treating PTSD, but there is only limited data regarding patients with PTSD related to CSA. This dissertation focused on both the assessment and the treatment of PTSD related to CSA. Paper 1 presents data from an ambulatory assessment study. Patients (N=28) were provided with electronic diaries for repeated real-time assessment of intrusions and flashbacks. They reported an average of 75 intrusions and 24 flashbacks during the week of assessment. Papers 2, 3, and 4 present data from a randomized controlled trial. Patients (N=74) were randomized to either a 12-week residential DBT-PTSD program or a treatment-as-usual wait list. The results for primary and secondary outcomes are shown in Paper 2. Data revealed a significant reduction of posttraumatic symptoms with a large between-group effect size (g=1.35). Paper 3 provides results on the impact of the definition of the index trauma. When the index trauma included multiple traumas, PTSD severity scores were significantly higher, and improvements from pre- to post-treatment were significantly lower, compared to when the index trauma was defined as the worst trauma. Paper 4 presents data on the utilization of mental health care. The mean total costs were 18000 €  per patient during the year before and  7233 € during the year after DBT-PTSD. The significant cost reduction was due to large reductions in inpatient treatment days (on average 57 days before and 14 days after DBT-PTSD). To sum up, the findings show clear evidence for the efficacy of the DBT-PTSD program. Data further indicate that DBT-PTSD might contribute to reducing the mental health care costs. Also, the results suggest that the currently applied methods of assessing PTSD in patients with severe symptoms might miss aspects of clinically relevant symptomatology.

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No description available.

Des nouveaux précurseurs non fluorés de cuivre (I) de la famille (b-dicétonate)Cu(L) (où L= BTMSA (Bis(triméthylsilyl) acétylène) ou TMSP (1-(triméthyl silyl) propyne)) ont été synthétisés par réaction acide-base et caractérisés. Parmi les précurseurs synthétisés, (5-méthyle-2,4-hexanedionate)Cu(BTMSA) et (5,5-diméthyle-2,4-hexanedionate)Cu(BTMSA) sont les précurseurs les plus prometteurs; ils sont liquides à température ambiante, très volatils et assez stables. A partir des précurseurs, les films adhérents, continus, purs et conducteurs électriques de cuivre métallique ont été déposés à partir de 170°C sur Ta/TaN. L'AuCl(PF3) a été évalué, dans ce travail de thèse, comme précurseur pour déposer de films minces d'or par CVD thermique. Ce précurseur inorganique a été utilisé sous forme solide pur (à l'aide d'un bulleur) ainsi que dissout dans une solution avec le toluène comme solvant (utilisant un système d'injection direct). En utilisant H2 comme gaz co-réactif, les films minces continus, purs d'or ont été déposés sur Ta/TaN à partir de 110°C. Nous avons étudié l'influence de la nature de gaz vecteurs (N2, H2), de la température de dépôt sur la réaction de décomposition du précurseur ainsi que sur les caractéristiques des films obtenus. L'utilisation de [IrCl(PF3)2]2 comme précurseur pour le dépôt CVD d'iridium a été réalisée, pour la première fois, dans ce travail de thèse. Ce précurseur inorganique est très volatil mais sensible. Nous l'avons généré "in-situ" dans le réacteur de dépôt CVD à partir de IrCl(PF3)4, le produit plus stable et manipulable. Sous N2, [IrCl(PF3)2]2 se décompose à partir de 240°C donnant des films compacts, extrêmement purs d'Ir sur SiO2/Si. Dans le cadre de ce travail, l'influence de la nature de gaz vecteurs (N2, H2 ou O2) et de la température de dépôt sur la croissance des films déposés a été également examinée.

La réalisation de revêtements projetés de haute qualité passe par une bonne cohésion du dépôt et une adhérence élevée des revêtements sur leur substrat. Du fait de leur mode d'élaboration, les microstructures des interfaces dépôt/substrat et particule/particule obtenues par projection thermique sont complexes et les propriétés en dépendant hétérogènes. Afin d'optimiser l'adhérence des revêtements, il est nécessaire d'établir des relations entre microstructure et résistance de ces interfaces. C'est l'objet de cette étude. Le système modèle cuivre projeté sur aluminium a été retenu non seulement pour son fort potentiel industriel mais également pour la grande réactivité métallurgique du couple (Al, Cu). Des interfaces présentant des propriétés métallurgiques variées ont ainsi pu être obtenues, en jouant sur les procédés et conditions de projection. Ces interfaces ont été analysées à des échelles fines. Des caractérisations quantitatives des propriétés métallurgiques et morphologiques de ces interfaces ont aussi été réalisées. Un essai d'adhérence original, utilisant le phénomène de choc laser, a été développé pour déterminer l'adhérence de revêtements épais (quelques centaines de microns) correspondant à ces interfaces. L'essai LASAT (pour LASer Adhérence Test) s'est avéré particulièrement sensible aux propriétés des interfaces et approprié à leur étude locale. L'association des analyses fines et quantitatives des interfaces avec l'évaluation de leur résistance par l'essai de choc laser a permis d'identifier les principaux mécanismes d'adhérence responsables de la bonne tenue des revêtements de Cu sur Al et/ou des particules de Cu sur celles déjà déposées, dans le cas de projections plasma, HVOF et cold spray. L'influence de la propreté et de la morphologie des interfaces sur l'adhérence des dépôts projetés a été, en particulier, étudiée. Enfin, des outils de simulation ont permis de reproduire les phénomènes intervenant aux interfaces obtenues par projection thermique et ainsi de préciser les modes de formation des liaisons interfaciales.

Solar photovoltaic modules provide clean electricity from sunlight but will not be able to compete on an open market until the cost of the electricity they produce is comparable to that produced by traditional methods. At present, modules based on crystalline silicon wafer solar cells account for nearly 90% of photovoltaic production capacity. However, it is anticipated that the ultimate cost reduction achievable for crystalline silicon solar cell production will be somewhat limited and that thin film solar cells may offer a cheaper alternative in the long term. The highest energy conversion efficiencies reported for thin film solar cells have been for devices based around chalcopyrite Cu(In, Ga)(Se, S)2 photovoltaic absorbers. The most efficient Cu(In, Ga)(Se, S)2 solar cells contain absorber layers deposited by vacuum co-evaporation of the elements. However, the cost of ownership of large area vacuum evaporation technology is high and may be a limiting factor in the cost reductions achievable for Cu(In, Ga)(Se, S)2 based solar cells. Therefore, many alternative deposition methods are under investigation. Despite almost thirty companies being in the process of commercialising these technologies there is no consensus as to which deposition method will lead to the most cost effective product. Non-vacuum deposition techniques involving powders and chemical solutions potentially offer significant reductions in the cost of Cu(In, Ga)(Se, S)2 absorber layer deposition as compared to their vacuum counterparts. A wide range of such approaches has been investigated for thirty years and the gap between the world record Cu(In, Ga)(Se, S)2 solar cell and the best devices containing non-vacuum deposited absorber layers has closed significantly in recent years. Nevertheless, no one technique has demonstrated its superiority and the best results are still achieved with some of the most complex approaches. The work presented here involved the development and investigation of a new process for performing one of the stages of non-vacuum deposition of Cu(In, Ga)(Se, S)2 absorber layers. The new process incorporates copper into an initial Group III-VI precursor layer, e.g. indium gallium selenide, through an ion exchange reaction performed in solution. The ion exchange reaction requires only very simple, low-cost equipment and proceeds at temperatures over 1000°C lower than required for the evaporation of Cu under vacuum. In the new process, indium (gallium) selenide initial precursor layers are immersed in solutions containing Cu ions. During immersion an exchange reaction occurs and Cu ions from the solution exchange places with Group III ions in the layer. This leads to the formation of an intimately bonded, laterally homogeneous copper selenide – indium (gallium) selenide modified precursor layer with the same morphology as the initial precursor. These modified precursor layers were converted to single phase chalcopyrite CuInSe2 and Cu(In, Ga)Se2 by annealing with Se in a tube furnace system. Investigation of the annealing treatment revealed that a series of phase transformations, beginning at low temperature, lead to chalcopyrite formation. Control of the timing of the Se supply was demonstrated to prevent reactions that were deemed detrimental to the morphology of the resulting chalcopyrite layers. When vacuum evaporated indium (gallium) selenide layers were used as initial precursors, solar cells produced from the absorber layers exhibited energy conversion efficiencies of up to 4%. While these results are considered promising, the devices were characterised by very low open circuit voltages and parallel resistances. Rapid thermal processing was applied to the modified precursor layers in an attempt to further improve their conversion into chalcopyrite material. Despite only a small number of solar cells being fabricated using rapid thermal processing, improvements in open circuit voltage of close to 150mV were achieved. However, due to increases in series resistance and reductions in current collection only small increases in solar cell efficiency were recorded. Rapid thermal processing was also used to demonstrate synthesis of single phase CuInS2 from modified precursor layers based on non-vacuum deposited indium sulphide. Non-vacuum deposition methods provide many opportunities for the incorporation of undesirable impurities into the deposited layers. Analysis of the precursor layers developed during this work revealed that alkali atoms from the complexant used in the ion exchange baths are incorporated into the precursor layers alongside the Cu. Alkali atoms exhibit pronounced electronic and structural effects on Cu(In, Ga)Se2 layers and are beneficial in low concentrations. However, excess alkali atoms are detrimental to Cu(In, Ga)Se2 solar cell performance and the problems encountered with cells produced here are consistent with the effects reported in the literature for excess alkali incorporation. It is therefore expected that further improvements in solar cell efficiency might be achieved following reformulation of the ion exchange bath chemistry.

In Cu(In,Ga)Se2 (CIGS) solar cells the CIGS layer serves as the light absorber, growing naturally p-type. Together with an n-type buffer layer they form a p-n heterojunction. Typically, CdS is used as a buffer, although other, less toxic materials are investigated as alternatives. The intrinsic p-type doping of CIGS layers is the result of complex defect physics. Defect formation energies in CIGS are very low or even negative, which results in extremely high defect concentrations. This leads to many unusual electrical phenomena that can be observed in CIGS devices. This thesis mostly focuses on three of these phenomena: light-soaking, light-on-bias, and light-enhanced reverse breakdown. Light-soaking is a treatment that involves illuminating the investigated device for an extended period of time. In most CIGS solar cells it results in an improvement of open-circuit voltage, fill factor, and efficiency that can persist for hours, if not days. The interplay between light-soaking and the remaining two phenomena was studied. It was found that light-soaking has a strong effect on light-on-bias behavior, while the results for light-enhanced breakdown were inconclusive, suggesting little to no impact. Light-on-bias is a treatment which combines simultaneous illumination and application of reverse bias to the studied sample. Illuminating CdS-based samples with red light while applying a reverse bias results in a significant increase in capacitance due to filling of traps. In many cases, this is accompanied by a decrease in device performance under red illumination. Complete recovery is possible by illuminating the treated sample with blue light, which causes hole injection from the CdS buffer. In samples with alternative buffer layers, there is little distinction between red and blue illumination, and the increase in capacitance is milder. At the same time, there is little effect on device performance. Reverse breakdown can occur when a sufficiently large reverse bias is applied to a p-n junction, causing a large reverse current to flow through the device. In CIGS solar cells, the voltage at which breakdown occurs in darkness decreases in the presence of blue illumination. A model explaining the breakdown in darkness was proposed as a part of this thesis. The model assumes that all voltage drops on the buffer layer in darkness and on the CIGS layer under blue illumination. The high electric field in the buffer facilitates Poole-Frenkel conduction and Fowler-Nordheim tunneling between the absorber and the buffer.

La durabilité des composants mécaniques en général et leur résistance à la corrosion en particulier ont une importance primordiale dans l’industrie moderne, qu’elle concerne la production d’énergie, les produits chimiques, le transport, les machines, les matériels médicaux, ou même les composants électroniques. Pour des pièces obtenues par usinage, il est donc nécessaire d’améliorer leur durée de vie et de réduire le risque de défaillance prématurée en améliorant leur intégrité de surface. Ainsi, une compréhension de l’effet du procédé sur l’intégrité de surface induite par usinage et ses conséquences au niveau de sa résistance à la corrosion sont les clés pour relever ces défis.Cette thèse traite le cas particulier de l’usinage de finition du cuivre Cu-c2 et son impact sur la résistance à la corrosion. D’abord, une étude expérimentale comparative du tournage et de la coupe orthogonale est effectuée. Ensuite, vu sa simplicité, la coupe orthogonale fait l’objet de la suite de l’étude. Un modèle numérique est développé pour la prédiction de l’intégrité de surface induite par la coupe. Il utilise une nouvelle loi constitutive du Cu-c2 tenant en compte les transformations microstructurales et l’état des contraintes dans le matériau. Enfin, les résultats issus des études expérimentales ainsi que des simulations numériques concernant l’intégrité de surface sont statistiquement traités dans une analyse multi-physique, dans la perspective d’établir le lien entre la résistance à la corrosion, l’intégrité des surfaces et la physique de la coupe. / The functional performance and life of mechanical components in general and their corrosion resistance in particular are of prime importance in the modern industry, as far as energy production, transportation, machines, medical and even electronic components are concerned. In the case of machined components, it is essential to improve their life and to reduce the premature failure by improving their surface integrity. So, a comprehension of the effect of the machining process mechanics on surface integrity and its consequences on corrosion resistance are essential.This thesis deals with the particular case of finishing machining of oxygen free high conductivity copper (OFHC) and its impact on the surface integrity and corrosion resistance. Firstly, a comparative experimental study between turning and orthogonal cutting is performed. Then, due to its simplicity, orthogonal cutting makes the object of the pursuit of the study. A numerical model is developed to predict the surface integrity induced by the cutting process. It uses a new constitutive model for OFHC copper taking into account microstructural transformations and the state of stress in the work material. Finally, the results issued from experimental studies and the numerical simulations are statistically treated in a multi-physical analysis with the objective of establishing the relationship between corrosion resistance, surface integrity and cutting physics.

Egozentrizität stellt ein weitverbreitetes Phänomen unter Menschen dar, besonders unter Kindern und Menschen mit psychischen Störungen. Bisher wurde Egozentrizität in der kognitiven Domäne untersucht, wie zum Beispiel während Theory of Mind (ToM) Fragestellungen und nur wenige Untersuchungen haben sich bisher mit emotionaler Egozentrizität während der Empathie befasst. Um emotionalen Mechanismen der Egozentrizität besser zu verstehen präsentiert die vorliegende Dissertation drei Studien zur Untersuchung von emotionaler Egozentrizität bei Kindern und in der Psychopathologie des Autismus und der Depression. Studie 1 zielte darauf ab die grundlegenden Mechanismen der erhöhten emotionalen Egozentrizität bei Kindern zu untersuchen und zeigte, dass diese durch die schlechte Konfliktverarbeitung von Kindern vermittelt wurde. In Studie 2 zeigten autistische Patienten eine normale emotionale Egozentrizität, aber bekannte Defizite in ToM. Diese Verhaltensdaten wurden durch eine funktionale resting-state Konnektivitätsanalyse in einer separaten Stichprobe ergänzt. Autistische Patienten zeigten eine intakte Konnektivität vom rechten supramarginalen Gyrus aus, einer Gehirnregion, welche in Verbindung gebracht wurde mit der Überwindung von emotionaler Egozentrizität. Studie 3 schließlich untersuchte emotionale Egozentrizität in der Depression und deren Zusammenhang mit Alexithymie und zeigte eine vergrößerte emotionale Egozentrizität in Patienten, unabhängig von Alexithymie. Allerdings verringerte Alexithymie die emotionale Egozentrizität bei Patienten und Kontrollen. Zusammenfassend erweitern die in der Dissertation präsentierten Studien den Erkenntnistand zu den Ursachen von emotionaler Egozentrizität in der Kindheit und liefern weitere Befunde für eine genauere Charakterisierung der sozio-kognitiven Defizite im Autismus und in der Depression. / Egocentricity has been described as a pervasive phenomenon among humans, with a particularly strong manifestation among children and individuals with psychopathologies. Traditionally egocentricity has been investigated nearly exclusively in the cognitive domain, such as for example during Theory of Mind (ToM) reasoning, but little work has so far focused on egocentricity in the affective domain during empathy. This dissertation presents three studies that investigated emotional egocentricity in child development and adult psychopathology, as in Autism Spectrum Disorder (ASD) and Major Depressive Disorder (MDD). Explicitly, study 1 aimed at elucidating the underlying mechanisms of increased emotional egocentricity in children, showing that increased emotional egocentricity in children was mediated by children’s poorer ability in conflict processing. Findings of study 2 showed that ASD patients exhibited normal emotional egocentricity, while showing known impairments in ToM. These behavioral findings were buttressed by an additional resting-state functional connectivity analysis in a separate sample of ASD patients and healthy controls. Results showed intact functional connectivity in ASD patients from right supramarginal gyrus, a brain region linked to overcoming emotional egocentricity. Findings of study 3 showed that MDD patients were prone to increased emotional egocentricity, independently of alexithymia. Alexithymia however decreased emotional egocentricity. In sum the studies in this dissertation represent a further step in advancing the knowledge about the underlying mechanisms of increased emotional egocentricity in child development and further help specifying the nature of socio-cognitive deficits portrayed in ASD and MDD.