Because their phase can be compensated by a grating-based stretcher compressor and further controlled by RF injection, quantum cascade laser based optical frequency comb generation allowed the generation of pulse as short as 630fs after compression, value confirmed using an upconversion technique with a sub-picosecond time resolution. Another possibility is the direct generation of optical solitons using ring quantum cascade lasers in which, by using a very low lateral loss waveguide, the symmetric counter-propagating modes undergo a spontaneous symmetry breaking and generate solitons.
SUMMARY Aim – The association between sporting activities, or lack there of, and suicidal behaviour has not yet been clarified. The objective of this study was to determine, if sports participation has an impact on risk for completed suicide. Methods – Axis I and Axis II disorders, sociodemographic factors, and current and former sports activities, including various sports disciplines, were assessed by a semi-structured interview by psychological autopsy method in 163 suicides and by personal interview in 396 living population-based control persons. Results – Current sports activities (OR = 0.24, 95%CI, 0.15 to 0.39; OR = 0.27, 95%CI, 0.16 to 0.45) and sports activities at some point in life (OR = 0.33, 95%CI, 0.18 to 0.62; OR = 0.40, 95%CI, 0.23 to 0.68, after adjustment for axis I and II disorders or educational level, each) were associated with decreased suicide risk. Conclusions – Current sports activities and sports activities at some point in life may reduce suicide risk. Declaration of Interest : Barbara Schneider got research funding as young scientist for the project “Psychopathological, sociodemographic, psychosocial, and work-related risk factors for suicide” from the faculty representative committee of the Faculty of Medicine, Johann Wolfgang Goethe-University of Frankfurt/Main. Furthermore, “Nachlaβ Martha Schmelz”, part of the university foundation of Frankfurt am Main, supported the research project. There was no support from drug companies related to the present paper. Barbara Schneider, Klaus Georgi, and Axel Schnabel are employed at the Goethe-University Hospital and Faculty of Medicine. Bettina Müller is employed at the Markus Hospital, Frankfurt /Main.
Programs to provide parents with opportunities to choose among public schools have increased to the point that more American high school students are enrolled in public “schools of choice” than private schools. Using indicators of students’ “exercise of choice “ and enrollment in a public school of choice from The National Education Longitudinal Study of 1988, this article explores certain groups’ propensities to take advantage of opportunities to choose in the public sector. Controlling on the availability of opportunities for choice in their schools, African Americans and Hispanics show a greater propensity to take advantage of those opportunities than Whites and Asian Americans. Students whose parents have lower levels of education are also more likely than those with more education to take advantage of opportunities to choose.
The transition to adulthood is not easily marked by specific life events such as completing school, getting married, or having children. Variations in timing and the economic and social pressures associated with the traditional signs of adulthood make young people’s decisions about their futures complex and uncertain. Experiences vary by gender, race, and ethnicity and by social, economic, family, and community resources. Rather than trying to define what adulthood is, institutions such as school and colleges should focus on customizing programs to meet the unique needs of specific populations. Better support systems should focus on the social and emotional needs of young people, to help them plan and execute a successful life course. Promising programs should be studied with more attention to the science of implementation and improvement.
