Mindfulness is an element of consciousness which has historically been associated with well-being. Mindfulness-based clinical interventions intend on reducing cognitive vulnerability to emotional distress and have produced promising results. Such endeavors however rest upon the dissent that remains among researchers on how to operationally define the construct. Measuring mindfulness in a valid and reliable manner is an essential part of scientific inquiry and facilitates the effort to define the construct. This study examines three newer self-report mindfulness instruments; Five Facet Mindfulness Questionnaire (FFMQ), the Toronto Mindfulness Scale (TMS) and the Experiences Questionnaire (EQ). A sample of non-meditators (Texas A&M University students; n =141) and meditators (non-clinical population from Bay Area, California; n =157) with a wide range of meditation experience completed the instruments. Multiple correlations allowed for an in-depth examination of the measures at full-scale and sub-scale level and all yielded significant and positive relations. Regression analyses established that meditation does increase mindfulness scores as measured by the FFMQ, TMS and EQ. Sub-scales FFMQ Observe, FFMQ Non React and TMS Decenter increased most of the combined eight facets; while FFMQ Describe and FFMQ Aware increased least. Lastly, the study examined how various aspects of meditation practice affect total mindfulness. Aspects of practice included: Number of sittings per week (sit/wk); time spent per meditation sitting (time/med); how long the participant has engaged in formal meditation (how long) and style of meditation (style). Meditation styles were grouped into the following categories; 1) Mindfulness, Vipassana, Zen and Shambhala; 2) Concentration and Transcendental; 3) Blend and 4) “I don’t know”. “Sit/wk”, “how long” and “style” were predictive of total mindfulness, with “how long” being the strongest predictor. All the mindfulness facets were predicted by meditation style except for FFMQ Observe, FFMQ Describe and TMS Curiosity. Meditation styles mindfulness, Vipassana, Zen and Shambhala were associated with the highest mindfulness scores.

Traveling-wave semiconductor optical amplifiers¡]TWSOAs¡^of symmetric and asymmetric multiple quantum wells¡]MQWs¡^have been implemented by using angled-facet structures. The asymmetric MQWs structures are designed to increase the wavelength range of the gain spectrum. The angled-facet structures, which can suppress gain ripple from FP resonance, are of 3mm-wide and 700mm-long ridge waveguides, and of different angles¡]q¡^at 3o, 5o, 7o, and 9o. From Marcuse¡¦s model, the calculation shows that the angled-facet structures have reflectivities lower than 10-4. We have also developed a single-trench process to fabricate the angled-facet TWSOAs. The l=1.55mm asymmetric structure, which shows a low epitaxial quality of large leakage current, is not suitable for SOA application. For the l=1.3mm asymmetric structure, the threshold current¡]Ith¡^at q=0o was 22.5mA, while at q=7o the Ith increased to 45mA. We have also measured the spectrum below threshold current. The differences between FP resonance peak and valley become smaller at larger q. We estimated that the reflectivity is about 0.2 at 5o. The results show that the reflectivity was decreased by angled-facet structure.

The Personality Inventory for DSM-5 (PID-5) is an emerging measure used to map pathological personality traits. In this thesis, the reliability and facet structure of the Swedish version of the PID-5 is evaluated. Further, the possible occurrence of higher-order factors of the pathological personality traits is explored. Using a sample of 275 observations, the facet structure and higher-order factors are investigated using structural equation modeling (SEM). Results show that the internal consistency, measured with Cronbach's alpha, is strong for the facets and adequate for the domains from the PID-5. The theorized facet structure could not be confirmed for the Swedish version of the PID-5. Treating the five domains as observed variables, support for a general factor of psychopathology and indications of the two factors internalizing and externalizing are found.