Age determination of ballpoint pen ink by thermal desorption and gas chromatography-mass spectrometry

Two main approaches can be used for determining the age of an ink: indirect dating and direct dating. Indirect dating is based on the chemical analysis of an ink followed by comparison with known samples in a reference collection. The collection should contain information about the inks including the market introduction dates. This approach may allow for an anachronism to be detected. The second concept is based on measuring ink components that change with age. The analysis of solvents in ballpoint inks may be a useful parameter for determining the age of ink on paper. In a previous study, the authors demonstrated that thermal desorption of ink directly from paper, followed by chemical analysis using gas chromatography-mass spectrometry (GC-MS), is a promising procedure for characterizing ink-binder resins and solvents. Preliminary tests showed that monitoring the evaporation of ink solvent from ink on paper is not a suitable method for ink dating. Thermal analysis of ink on paper in two steps revealed that fresh ink releases a relative amount of solvent at a certain low temperature in a defined period of time, which decreases as the ink ages. As a consequence, this relative amount of solvent released at a certain low temperature, and its decrease with time, can be used to estimate ink age. This age-dependent parameter was studied in 85 different inks ranging in age from 1 week to 1.5 years. It was found that some inks showed a significant decrease of this parameter up to an age of several months, and that the aging process can be monitored within this period. For other inks, however, the age-dependent parameter decreases relatively fast, e.g., within a few days, to a constant level, which can be too fast for casework. Based on these results, a general procedure for assessing the age of ballpoint pen inks on paper was developed.     

The innovative performance of foreign-owned enterprises in small open economies

This paper compares the innovative performance of foreign-owned and domestically owned enterprises in five European countries. We look at innovation inputs, outputs, and examine how strong foreign-owned enterprises are embedded in the innovations systems of their host countries. We find that foreign ownership is associated with similar levels of innovation input, but higher levels of innovation output and higher labour productivity compared to domestic ownership. In four of the five countries, affiliates of foreign multinationals show a similar or even a higher propensity to co-operate with domestic partners than domestically owned enterprises.

Family negativity and delinquent behavior in adolescence: a predictive multivariate latent growth analysis

ABSTRACT

The current study had three aims: (1) to explore whether there is over-time change in adolescent delinquency and negativity in the parent–adolescent, sibling and marital relationships during adolescence; (2) to examine the interactions of negativity across subsystems; and (3) to examine whether levels and changes in adolescent delinquency are predicted by levels and changes in negativity in all family subsystems. Data of 497 families participating in the RADAR-young study were used. Ratings of all family members were used to measure negativity in family relationships, and adolescent self-report was used for delinquency. Multivariate latent growth curve models showed over-time increases in mother-adolescent negativity and over-time decreases in sibling negativity, as well as significant individual differences in these changes. Second, evidence for both social contagion and compensatory processes in family negativity was found. Third, initial levels of parent–adolescent negativity were related to initial levels but not over-time changes of adolescent delinquency, whereas initial levels of sibling negativity were related to over-time changes but not initial levels of adolescent delinquency. Finally, increases in parent–adolescent negativity were related to faster increases in adolescent delinquency, and decreases in sibling negativity were related to slower increases in adolescent delinquency. Implications of these results are discussed.     

The Danish Election 1998

The article analyzes the Danish national election in March 1998. Jdged from the aggregate figures, Denmark has stabilized. Net volatility was moderate, 'bloc' volatility was close to zero, and despite forecasts of a non-socialist victory, the Social Democratic-led government managed to continue. Further, in the 1990s, the periods between elections have been close to the maximum four years. Therefore, the old picture from the 1970s of Danish politics as highly unstable and as extremely volatile is now outdated. Quite the contrary at the level of individual voters. Close to a third shifted from one party to another, and even among voters who did not shift, a substantial proportion had considered voting for another party. Individual voter mobility seems to be a result of weak voter differentiation between different parties, and not a result of protest and outspoken dissatisfaction. Whatever the explanation, individual volatility is an omen of possible future instability: There is no guarantee that different voter movements will always balance out.     

Healing the Pain

The World Bank released its Global Economic Prospects 2010 in June, saying global economic recovery is advancing with developing countries leading it. But high-income countries’