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Optical properties of aerosol mixtures derived from sun‐sky radiometry during SAMUM‐2
TOLEDANO, C.,WIEGNER, M.,GROß, S.,FREUDENTHALER, V.,GASTEIGER, J.,MÜ,LLER, D.,MÜ,LLER, T.,SCHLADITZ, A.,WEINZIERL, B.,TORRES, B.,O'NEILL, N. T. Blackwell Publishing Ltd 2011 Tellus. Series B, Chemical and physical meteorolog Vol.63 No.4
<P><B>ABSTRACT</B></P><P>The SAMUM‐2 experiment took place in the Cape Verde islands in January–February 2008. The colocated ground‐based and airborne instruments allow the study of desert dust optical and microphysical properties in a closure experiment. The Meteorological Institute of the University of Munich deployed one sun‐sky photometer and two tropospheric lidar systems. A travelling AERONET‐Cimel sun‐sky radiometer was also deployed. During the measurement period the aerosol scenario over Cape Verde mostly consisted of a dust layer below 2 km and a smoke‐dust layer above 2–4 km a.s.l. The Saharan dust arrived at the site from the NE, whereas the smoke originated in the African equatorial region. This paper describes the main results of the Sun photometer observations, supported by lidar information. An analysis of the variations in the aerosol optical depth (AOD) in the range 340–1550 nm, the Ångström exponent, volume size distributions and single scattering albedo is presented. The aerosol mixtures are analysed by means of the fine mode fraction of the AOD provided by the sun‐sky inversion data and the Spectral Deconvolution Algorithm. The mean AOD (500 nm) was 0.31, with associated low Ångström exponent of 0.46. Several types of events were detected within the data set, with prevalence of dust or mixtures as characterized by the Ångström exponents of extinction and absorption and the fine mode fraction. Aerosol properties derived from sunphotometry were compared to in situ measurements of size distribution, effective radius and single scattering albedo.</P>
Kyung-Jin Park,Tessa Kroker,Uwe Groß,Ortrud Zimmermann,Felix Krause,Rainer Haak,Dirk Ziebolz 대한치과교정학회 2019 대한치과교정학회지 Vol.49 No.4
Objective: To evaluate the effectiveness of three different caries-preventing agents on artificial caries in a Streptococcus mutans -based caries model. Methods: Sixty-five caries-free human molar enamel blocks were treated with a demineralization solution and a remineralization solution. The specimens were assigned to the following groups according to the caries-protective product applied: group A, chlorhexidine varnish; group B, fluoride-releasing chemically cured sealant; group C, fluoride-releasing lightcured sealant; group D, positive control (specimens that were subjected to de- and remineralization cycles without treatment with any caries-protective agents); and group E, negative control (specimens that were not subjected to de- and remineralization cycles). Samples in groups A–D were stored in demineralization solution with S. mutans and thereafter in artificial saliva. This procedure was performed for 30 days. Average fluorescence loss (ΔF) and surface size of the lesions were measured using quantitative light-induced fluorescence at baseline and on the 7th, 14th, and 30th days. Results: After 30 days, group A demonstrated a significant increase in ΔF and the surface size of the lesions, no significant difference in comparison with the positive control group, and a significant difference in comparison with the negative control group. Group B showed no significant changes in both parameters at any of the measurement points. While group C showed increased ΔF after 14 days, no significant fluorescence change was observed after 30 days. Conclusions: Both fluoride-releasing sealants (chemically or light-cured) show anti-cariogenic effects, but the use of chlorhexidine varnish for the purpose of caries protection needs to be reconsidered.
( Ines Daniel(dr. ) ),( Michael Brusch(prof. Dr. ) ),( Kerstin Große(b. Sc. ) ),( Therese Kozlowski(m. Sc. ) ) 한국품질경영학회 2015 한국품질경영학회 학술대회 Vol.2015 No.2
Purpose Nowadays, people are one of the most important resources for a company and an employer brand is an intangible asset. First, well-trained graduates are looking for companies that embody certain characteristics and fit their needs at the best possible rate. Second, companies are looking for motivated and capable employees, which allow the company to achieve good performances, to generate a positive image of the labor market and retain more loyal employees to the company. Due to these circumstances, companies need to differentiate themselves clearly from other companies and produce a higher perceived employer attractiveness to find the best employees. This can be done by a sophisticated and individual employer branding concept. Methodology/Approach In this investigation, an empirical investigation of roundabout 430 students of a technical university in a medium-sized city in Germany was conducted. The data collection and analysis will focus on different methodical alternatives identifying factors and important criteria of employer branding. Therefore, multivariate data analysis methods such as factor analysis will be applied. Furthermore, some region specific problems are analyzed. Originality/Value of Paper The analyses of the empirical data focus on important factors of employer branding and allow new insights for researchers from a theoretical and from a practical point of view, especially to smaller regions and companies. To ensure efficient employer branding, it is particularly important to detect which factors influence the attractiveness of the employer, which criteria are especially important, and how potential employees are looking for new employers. In addition, some general implications and recommendations for later use will be developed.
Yi, Jue-Min,Smirnov, Vladimir,Piao, Xianji,Hong, Jiho,Kollmann, Heiko,Silies, Martin,Wang, Wei,Groß, Petra,Vogelgesang, Ralf,Park, Namkyoo,Lienau, Christoph American Chemical Society 2016 ACS NANO Vol.10 No.1
<P>We report a drastic increase of the damping time of plasmonic eigenmodes in resonant bull's eye (BE) nanoresonators to more than 35 fs. This is achieved by tailoring the groove depth of the resonator and by coupling the confined plasmonic field in the aperture to an extended resonator mode such that spatial coherence is preserved over distances of more than 10 mu m. Experimentally, this is demonstrated by probing the plasmon dynamics at the field level using broadband spectral interferometry. The nanoresonator allows us to efficiently concentrate the incident field inside the central aperture of the BE and to tailor its local optical nonlinearity by varying the aperture geometry. By replacing the central circular hole with an annular ring structure, we obtain 50-times higher second harmonic generation efficiency, allowing us to demonstrate the efficient concentration of long-lived plasmonic modes inside nanoapertures by interferometric frequency-resolved autocorrelation. Such a light concentration in a nanoresonator with high quality factor has high potential for sensing and coherent control of light-matter interactions on the nanoscale.</P>
Dynamics of magnetic droplet soliton: freezing and thawing; coexisting and interacting
S. Chung,M. Ahlberg,S. Jiang,A. Frisk,M. Khademi,R. Khymyn,A. A. Awad,Q. Tuan Le,H. Mazraati,A. Houshang,M. Mohseni,M. Weigand,I. Bykova,F. Groß,E. Goering,G. Schutz,J. Grafe,O. Heinonen,J. Akerman 한국자기학회 2023 한국자기학회 학술연구발표회 논문개요집 Vol.33 No.1