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  • 1
    Online Resource
    Online Resource
    Influence of supramolecular additives on foam morphology of injection-molded i-PP
    SAGE Publications ; 2011
    In:  Journal of Cellular Plastics Vol. 47, No. 6 ( 2011-11), p. 519-534
    Details
    In: Journal of Cellular Plastics, SAGE Publications, Vol. 47, No. 6 ( 2011-11), p. 519-534
    Abstract: Foaming isotactic polypropylene (i-PP) by foam injection molding usually results in inhomogeneous, large cell structures. Possibilities to realize more homogeneous and finer foam morphologies are adjusting processing parameters or adding nucleating agents. Often, inorganic nucleating agents such as talc in concentrations of about 2 wt% are used to influence the foam morphology. This article discusses the use of two benzene trisamide-based nucleating agents to control cell nucleation during foaming of i-PP. These additives form supramolecular nanostructures in the polymer melt acting first as nucleating sites for foam formation and second as nuclei for the polymer crystallization. Foaming was performed by foam injection molding with nitrogen as physical blowing agent. A specially designed variotherm mold technology was utilized to exactly control the foaming temperature, foaming pressure, and expansion ratio. Foamed i-PP samples were prepared with a density reduction of 50% and analyzed with respect to foam structure and mechanical properties. We demonstrate that the benzene trisamide additives have a strong influence on the foam morphology at very low additive concentrations. Only 0.02 wt% of an additive is sufficient to obtain a remarkable reduction of the cell sizes. It appears that the cell struts, those dimensions can be influenced by the additives as well, leads to a significant improvement of the mechanical properties.
    Type of Medium: Online Resource
    ISSN: 0021-955X , 1530-7999
    URL: Article
    DOI: 10.1177/0021955X11408769
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2011
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  • 2
    Online Resource
    Online Resource
    The Hiring Prospects of Foreign-Educated Immigrants: A Factorial Survey among German Employers
    SAGE Publications ; 2019
    In:  Work, Employment and Society Vol. 33, No. 5 ( 2019-10), p. 739-758
    Details
    In: Work, Employment and Society, SAGE Publications, Vol. 33, No. 5 ( 2019-10), p. 739-758
    Abstract: This article analyses the conditions under which employers grant immigrants access to jobs corresponding to their foreign education. It is often observed that employers prefer native-educated employees and devalue foreign education. We argue that part of this devaluation is due to institutional differences in education systems. Nevertheless, hiring foreign-educated immigrants is becoming a viable strategy for employers given the substantial shortage of skilled labour and the significant influx of skilled immigrants. Using a factorial survey, we simulate a hiring process and present a series of hypothetical foreign applicants to employers in Germany. Our findings show that the transferability of foreign qualifications strongly depends on the institutional characteristics of foreign education systems. However, employers are willing to accept differences in education because they consider institutional differences a trade-off against other dimensions, such as relevant foreign work experience.
    Type of Medium: Online Resource
    ISSN: 0950-0170 , 1469-8722
    URL: Article
    DOI: 10.1177/0950017018809897
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2019
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    SSG: 2
    SSG: 3,4
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  • 3
    Online Resource
    Online Resource
    Adiponectin in coronary heart disease and newly diagnosed impaired glucose tolerance
    SAGE Publications ; 2013
    In:  Diabetes and Vascular Disease Research Vol. 10, No. 5 ( 2013-09), p. 452-458
    Details
    In: Diabetes and Vascular Disease Research, SAGE Publications, Vol. 10, No. 5 ( 2013-09), p. 452-458
    Abstract: Adiponectin is produced by adipose tissue and regarded as protective hormone for diabetes and coronary heart disease (CHD). Its role in heart failure is discussed controversially. Methods: In this study, 1015 consecutive patients admitted for acute ( n = 149) or elective ( n = 866) coronary angiography were enrolled. Patients with known diabetes mellitus (DM) were excluded. All patients were classified by oral glucose tolerance test (oGTT) according to World Health Organization (WHO) criteria and by the results of coronary angiography as no/minor coronary heart disease (CHD), single-vessel disease (1-VD), double-vessel disease (2-VD) or triple-vessel disease (3-VD), by New York Heart Association (NYHA) criteria and by echocardiography for heart failure. Adiponectin and N-terminal pro-brain natriuretic peptide (NT-proBNP) levels were measured in all patients. Results: Adiponectin was higher in patients with normal glucose tolerance (NGT) (13.65 ± 10.31 mg/l) compared to impaired glucose tolerance (IGT) (11.12 ± 7.5, p 〈 0.001) or diabetes (11.22 ± 7.63, p 〈 0.001). There was a stepwise decrease in adiponectin from no CHD (18.16 ± 12.49 mg/L) to minor CHD (16.01 ± 11.42) to 1-VD (12.18 ± 8.8, p 〈 0.001 to no/minor CHD) to 2- and 3-VD (10.68 ± 7.5, p 〈 0.001 to no/minor CHD, p = 0.004 to 1-VD). Patients with heart failure NYHA III (17.4 ± 10.27) had higher adiponectin levels compared to NYHA II (12.94 ± 9.41, p 〈 0.001 to NYHA III) and NYHA I (10.3 ± 7.75, p 〈 0.001 to NYHA III/II). In this line, adiponectin levels were positively correlated to NT-proBNP levels ( r = 0.303), and patients with ejection fraction (EF) 〈 50% had higher adiponectin levels than those with EF 〉 50% (14.96 ± 4.35 to 11.78 ± 3.71, p = 0.006). Conclusion: Adiponectin levels are inversely correlated to progressing CHD and glucose intolerance but positively correlated to increasing heart failure.
    Type of Medium: Online Resource
    ISSN: 1479-1641 , 1752-8984
    URL: Article
    DOI: 10.1177/1479164113490179
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2013
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