84 research outputs found
Effect of edge transmission and elastic scattering on the resistance of magnetic barriers
Strong magnetic barriers are defined in two-dimensional electron gases by
magnetizing dysprosium ferromagnetic platelets on top of a Ga[Al]As
heterostructure. A small resistance across the barrier is observed even deep
inside the closed regime. We have used semiclassical simulations to explain
this behavior quantitatively in terms of a combined effect of elastic electron
scattering inside the barrier region and E x B drift at the intersection of the
magnetic barrier with the edge of the Hall bar.Comment: 7 pages 4 figure
Manipulating the Tomonaga-Luttinger exponent by electric field modulation
We establish a theoretical framework for artificial control of the power-law
singularities in Tomonaga-Luttinger liquid states. The exponent governing the
power-law behaviors is found to increase significantly with an increase in the
amplitude of the periodic electric field modulation applied externally to the
system. This field-induced shift in the exponent indicates the tunability of
the transport properties of quasi-one-dimensional electron systems.Comment: 7 pages, 3 figure
Cultural and Media Identity Among Latvian Migrants in Germany
This chapter explores how transnational media and culture impacts on the identity formation of recent Latvian migrants in Germany. In the context of the EU, Germany opened its labour market to the new EU countries rather late, when compared to other ‘old’ EU countries. This has had an effect on the composition of the group of Latvian migrants going to Germany, and their identities. In the light of this, this chapter examines how Latvian migrants in Germany feel and experience their belonging to Latvia and its culture. It analyses the social and communicative practices crucial for the development of belonging, including the rootedness in the country where they live and the cultural references that are important for them. The evidence for the analysis in this chapter comes from in-depth interviews, open media diaries and network maps of Latvian migrants in Germany. The chapter situates the description of evidence in the framework of cultural identity concepts and discusses the role of culture and media in the process of building migrant identity. The chapter argues that culture is shaping the transnational self-perception of Latvian migrants in Germany – as it provides collective narratives of imagined common frames of references, and confirms feelings of belonging and distinction
Natural and Synthetic Polymers as Inhibitors of Drug Efflux Pumps
Inhibition of efflux pumps is an emerging approach in cancer therapy and drug delivery. Since it has been discovered that polymeric pharmaceutical excipients such as Tweens® or Pluronics® can inhibit efflux pumps, various other polymers have been investigated regarding their potential efflux pump inhibitory activity. Among them are polysaccharides, polyethylene glycols and derivatives, amphiphilic block copolymers, dendrimers and thiolated polymers. In the current review article, natural and synthetic polymers that are capable of inhibiting efflux pumps as well as their application in cancer therapy and drug delivery are discussed
Photoemission Spectroscopy and Atomic Force Microscopy Investigation of Vapor Phase Co-Deposited Silver/Poly(3-hexylthiophene) Composites
Nanocomposite matrices of silver/poly(3-hexylthiophene) (P3HT) were prepared
in ultrahigh vacuum through vapor-phase co-deposition. Change in
microstructure, chemical nature and electronic properties with increasing
filler (Ag) content were investigated using in-situ XPS and UPS, and ambient
AFM. At least two chemical binding states occur between Ag nanoparticles and
sulfur in P3HT at the immediate contact layer but no evidence of interaction
between Ag and carbon (in P3HT) was found. AFM images reveal a change in Ag
nanoparticles size with concentration which modifies the microstructure and the
average roughness of the surface. Under co-deposition, P3HT largely retains its
conjugated structures, which is evidenced by the similar XPS and UPS spectra to
those of P3HT films deposited on other substrates. We demonstrate here that the
magnitude of the barrier height for hole injection and the position of the
highest occupied band edge (HOB) with respect to the Fermi level of Ag can be
controlled and changed by adjusting the metal (Ag) content in the composite.
Furthermore, UPS reveals distinct features related to the C 2p (Sigma states)
in the 5-12 eV regions, indicating the presence of ordered P3HT which is
different from solution processed films.Comment: Scudier and Wei provided equal contributio
The extent of the psychological impairment of prosthodontic outpatients at a German University Hospital
Patients' preferences for subcutaneous trastuzumab versus conventional intravenous infusion for the adjuvant treatment of HER2-positive early breast cancer: final analysis of 488 patients in the international, randomized, two-cohort PrefHer study
PrefHer revealed compelling and consistent patient preference for subcutaneous (s.c.) trastuzumab, regardless of delivery by single-use injection device or hand-held syringe. s.c. trastuzumab was well-tolerated and safety data, including immunogenicity, were consistent with previous reports. No new safety signals were identified compared with the known intravenous trastuzumab profile in early breast cance
Disk displacement, eccentric condylar position, osteoarthrosis – misnomers for variations of normality? Results and interpretations from an MRI study in two age cohorts
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