Investigation of the excited state iodine lifetime in the photodissociation of perfluoroalkyl iodides

An evaluation of prospective laser materials for a space-based solar pumped laser system over the past decade has resulted in the identification of the iodine photodissociation laser as that system best suited to solar-pumped high energy operation. The active medium for the solar-pumped iodine photodissociation laser is from the family of perfluoroalkyl iodides. These lasants have the general form C(n)F(2n + 1)I, often abbreviated as RI. These iodides are known to exhibit photodissociaiton of the C-I bond when irradiated by near UV photons. The focus was on the experimental determination of the lifetime of the excited iodine atom following photodissociation of C4F9I, and also to monitor fluorescence from the iodine molecule at 500 nm to determine if I2 is being produced in the process. Photodissociation is achieved using an XeCl excimer laser with an output wavelength of 308 nm. The XeCl beam is focused into the middle of a cylindrical quartz cell containing the lasant. The laser pulse is detected with a fast risetime photomultiplier tube as it exits the cell. Other aspects of the investigation are discussed

Immigration and Status Exchange in Australia and the United States

The claim that marriage is a venue for status exchange of achieved traits, like education, and ascribed attributes, notably race and ethnic membership, has regained traction in the social stratification literature. Most studies that consider status exchanges ignore birthplace as a social boundary for status exchanges via couple formation. This paper evaluates the status exchange hypothesis for Australia and the United States, two Anglophone nations with long immigration traditions whose admission regimes place different emphases on skills. A log-linear analysis reveals evidence of status exchange in the United States among immigrants with lower levels of education and mixed nativity couples with foreign-born husbands. Partly because Australian educational boundaries are less sharply demarcated at the postsecondary level, we find is weaker evidence for the status exchange hypothesis. Australian status exchanges across nativity boundaries usually involve marriages between immigrant spouses with a postsecondary credential below a college degree and native-born high school graduates.

Immigration and Status Exchange in Australia and the United States

The claim that marriage is a venue for status exchange of achieved traits, like education, and ascribed attributes, notably race and ethnic membership, has regained traction in the social stratification literature. Most studies that consider status exchanges ignore birthplace as a social boundary for status exchanges via couple formation. This paper evaluates the status exchange hypothesis for Australia and the United States, two Anglophone nations with long immigration traditions whose admission regimes place different emphases on skills. A log-linear analysis reveals evidence of status exchange in the United States among immigrants with lower levels of education and mixed nativity couples with foreign-born husbands. Partly because Australian educational boundaries are less sharply demarcated at the postsecondary level, we find is weaker evidence for the status exchange hypothesis. Australian status exchanges across nativity boundaries usually involve marriages between immigrant spouses with a postsecondary credential below a college degree and native-born high school graduates.educational assortative mating, immigration, status exchange

La simplificación de la identidad cultural en la historia de la Guerra Civil española

La euforia reinante tras la muerte del dictador condicionó la idealización de la producción cultural de los republicanos durante la Guerra Civil. Sin embargo ocultó a la vez las contradiciones y simplificaciones inherentes en algunas de estas obras. En este contexto los actuales críticos de la cultura nos pueden facilitar una visión de aquellos años más matizada donde se enfrenta con el peligro de la manipulación de la cultura por el Estado, pero sin olvidar la extensión de la práctica cultural a un más amplio sector de la població

Immigration and Status Exchange in Australia and the United States

The claim that marriage is a venue for status exchange of achieved traits, like education, and ascribed attributes, notably race and ethnic membership, has regained traction in the social stratifi cation literature. Most studies that consider status exchanges ignore birthplace as a social boundary for status exchanges via couple formation. This paper evaluates the status exchange hypothesis for Australia and the United States, two Anglophone nations with long immigration traditions whose admission regimes place diff erent emphases on skills. A log-linear analysis reveals evidence of status exchange in the United States among immigrants with lower levels of education and mixed nativity couples with foreign-born husbands. Partly because Australian educational boundaries are less sharply demarcated at the postsecondary level, we fi nd weaker evidence for the status exchange hypothesis. Australian status exchanges across nativity boundaries usually involve marriages between immigrant spouses with a postsecondary credential below a college degree and native-born high school graduates.Status exchange; immigration; educational assortative mating

Immigration and Status Exchange in Australia and the United States

The claim that marriage is a venue for status exchange of achieved traits, like education, and ascribed attributes, notably race and ethnic membership, has regained traction in the social stratification literature. Most studies that consider status exchanges ignore birthplace as a social boundary for status exchanges via couple formation. This paper evaluates the status exchange hypothesis for Australia and the United States, two Anglophone nations with long immigration traditions whose admission regimes place different emphases on skills. A loglinear analysis reveals evidence of status exchange in the United States among immigrants with lower levels of education and mixed nativity couples with foreign-born husbands. Partly because Australian educational boundaries are less sharply demarcated at the postsecondary level, we find is weaker evidence for the status exchange hypothesis. Australian status exchanges across nativity boundaries usually involve marriages between immigrant spouses with a postsecondary credential below a college degree and native-born high school graduates.Status exchange, immigration, educational assortative mating