NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenIPH Teisnach
Werner Bogner, Johannes Jakob, R. Weigel, Franz Xaver Röhrl, Stefan Zorn
Bare die connections via aerosol jet technology for millimeter wave applications
International Journal of Microwave and Wireless Technologies, vol. 11, no. Special Issue 5-6 (EuMW 2018 Special Issue (Part I)) [June], pp. 441-446
This paper presents a comparison of chip connections using aerosol jet (AJ) and bond technology on low-cost printed circuit board (PCB) substrates. First, the behavior of the used gap filler material and the used silver ink for AJ technology on PCBs are characterized. In addition to comparing the radio frequency (RF) performance (DC to 67 GHz) of the two technologies, the mechanical stability is also compared. While the AJ technology transitions score above all for their RF performance and the lower requirements (surface finish, pad size, and adhesion) on the PCB, the bonding technology has clear advantages, especially with a different coefficient of thermal expansion values of the substrates to be connected. Finally, the measurement results of a complete package are shown, whereby the chip connection is realized once by means of AJ and once by bonding wires.
GesundEuropan Campus Rottal-Inn
Irmgard Tischner, H. Malson, K. Fey
Leading ladies: discursive constructions of women leaders in the UK media
Feminist Media Studies, no. Published online: 10 July 2019
Women continue to be economically disadvantaged and under-represented in positions of power and leadership. A discursive disjunction between cultural and media representations of women and leadership has been implicated in these continuing inequalities. We address this issue through an analysis of the ways in which prominent women leaders were portrayed in a UK radio series, BBC Radio 4’s “Profile” broadcast between July 2011 and July 2013. Verbatim transcripts of 12 broadcasts featuring women were analysed within a critical feminist framework, to explore the ways in which these women leaders were discursively constructed. Our analysis explicates three constructions of “women leaders”: as “traditionally” feminine; as having to balance “masculine” and “feminine” attributes; and as exceptional women who may nevertheless fail. We conclude that the impact of equality legislation continues to be limited while androcentric norms prevail and that we therefore need more gynocentric ways of imagining women leaders.
Union membership and employment dynamics: The role of the union objective function
Theoretical Economics Letters, vol. 9, no. 5, pp. 1473-1479
This paper studies the behaviour of a labour union in a model with employment and membership dynamics. It is known from the literature that the relative level of employment between intertemporal and static union models is affected by the structure of the union density function. We show that this result does not hold in general but rather that it depends on the union objective function. If the union maximises the wage bill of their members, employment in the intertemporal model will differ from employment in the static model depending on the union density function. However, if the union maximises the rent from unionisation, the intertemporal model will yield the same level of employment as the static model regardless of the union density.
S. Kuphal, S. Lamm, Melanie Kappelmann-Fenzl, S. Meierjohann, L. Feuerer, S. Haferkamp, C. Hellerbrand, A. Bosserhoff, I. Henz
Role of MIA (melanoma inhibitory activity) in melanocyte senescence
Pigment Cell & Melanoma Research, no. First Published: 06 June 2019
The protein MIA is known to be expressed in melanoma and to support melanoma progression. Interestingly, previous studies also observed the expression of MIA in nevi. Concentrating on these findings, we revealed that MIA expression is correlated with a senescent state in melanocytes. Induction of replicative or oncogene‐induced senescence resulted in increased MIA expression in vitro. Notably, MIA‐knockdown in senescent melanocytes reduced the percentage of senescence‐associated beta‐Gal‐positive cells and enhanced proliferation. Using the melanoma mouse model Tg(Grm1), MIA‐deficient mice supported the impact of MIA on senescence by showing a significantly earlier tumor onset compared to controls. In melanocytes, MIA‐knockdown led to a downregulation of the cell cycle inhibitor p21 in vitro and in vivo. In contrast, after induction of hTERT in human melanoma cells, p21 regulation by MIA was lost. In summary, our data show for the first time that MIA is a regulator of cellular senescence in human and murine melanocytes.
NachhaltigAngewandte Naturwissenschaften und WirtschaftsingenieurwesenTAZ Spiegelau
J.-M. Batke, S. Wittman, Günther Ruhl, I. Costina, M. Lemme, T. Preis, M. König, A. Gahoi
Accurate Graphene-Metal Junction Characterization
IEEE Journal of the Electron Devices Society (J-EDS), vol. 7, pp. 219-226
A reliable method is proposed for measuring specific contact resistivity (p C ) for graphenemetal contacts, which is based on a contact end resistance measurement. We investigate the proposed method with simulations and confirm that the sheet resistance under the metal contact (R SK ) plays an important role, as it influences the potential barrier at the graphene-metal junction. Two different complementary metal-oxide-semiconductor-compatible aluminum-based contacts are investigated to demonstrate the importance of the sheet resistance under the metal contact: the difference in R SK arises from the formation of insulating aluminum oxide (Al 2 O 3 ) and aluminum carbide (Al 4 C 3 ) interfacial layers, which depends on the graphene pretreatment and process conditions. Auger electron spectroscopy and X-ray photoelectron spectroscopy support electrical data. The method allows direct measurements of contact parameters with one contact pair and enables small test structures. It is further more reliable than the conventional transfer length method when the sheet resistance of the material under the contact is large. The proposed method is thus ideal for geometrically small contacts where it minimizes measurement errors and it can be applied in particular to study emerging devices and materials.
NachhaltigAngewandte Naturwissenschaften und Wirtschaftsingenieurwesen
Hongyu Zhang, Jizhong Sun, Ali Hamid, Thomas Stirner, Arvind Jadon
Molecular dynamics simulations of helium clustering and bubble growth under tungsten surfaces
Computational Materials Science, vol. 163, no. June, pp. 141-147
We study the surface response of W to helium bombardment using molecular dynamics simulations. Simulations have been performed for incident helium of energy 80 eV and surface temperature 2100 K. The saturation of He retention has been observed to be high, a result of the bubbles trapping helium atoms and preventing them from diffusing to the surface and further back into the plasma. On the other hand, we have observe near-surface “cluster rupture” leading to the expulsion of helium atoms towards the vacuum. We have found that bubbles typically grow in a relatively narrow band of He/V ratios (1–3). Besides, it was observed that tungsten atoms migrated from the top surface into the bulk. The coalescence of helium bubbles has also been observed.