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Seunggwan Shin,Heungsik Lee,Menzel Frank,이승환 한국응용곤충학회 2020 Journal of Asia-Pacific Entomology Vol.23 No.2
The Phytosciara genus group (Diptera, Sciaridae: Phytosciara Frey, Dolichosciara Tuomikoski, and Prosciara Frey) are studied in the Korean peninsula. Dolichosciara koreaensis Shin & Menzel sp. n. is described and illustrated as new to science. Additionally, four species are reported as new to Korea: Dolichosciara orcina (Tuomikoski, 1960), Dolichosciara semiferruginea (Menzel, 1995), Prosciara producta (Tuomikoski, 1960), and Prosciara ussuriensis (Antonova, 1977). Identification keys are given for the genera of the Phytosciara genus group and for the Korean species of the genera Dolichosciara Tuomikoski and Prosciara Frey. The COI barcode for the new species is studied.
Enhanced Critical Fields in MnSi Thin Films
Dirk Menzel,Josefin Engelke,Tommy Reimann,Stefan S¨ullow 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.10
The magnetic properties of the cubic helimagnet MnSi are governed by the Dzyaloshinskii-Moriya interaction which in the bulk stabilizes a helical ground state below 29 K with a spin-helix wavelength of 18 nm and a propagation vector along the [111] direction. Recently, MnSi has attracted a lot of attention after a skyrmion lattice had been discovered in the so called A-phase. We have prepared thin MnSi films on Si(111) substrates by codeposition of Mn and Si. Two films with a thickness below and above the spin helix length have been investigated using SQUID magnetometry. In comparison to bulk material, the films show an enhanced magnetic ordering temperature of 45 K. Magnetoresistance measurements performed on the films reveal a decrease of the resistivity with increasing field. They show together with the magnetic characterization that the critical fields describing the transition from the helical to a conical spin phase and from the conical phase to a parallel spin alignment are dependent on the film thickness and enhanced in comparison to single crystalline MnSi. The form anisotropy which prefers a spin alignment in the film plane is suggested to be the origin for the enhancement of the critical fields.
Zhang, Hehe,Yoo, Sijung,Menzel, Stephan,Funck, Carsten,Cü,ppers, Felix,Wouters, Dirk J.,Hwang, Cheol Seong,Waser, Rainer,Hoffmann-Eifert, Susanne American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.35
<P>Redox-type resistive random access memories based on transition-metal oxides are studied as adjustable two-terminal devices for integrated network applications beyond von Neumann computing. The prevailing, so-called, counter-eight-wise (c8w) polarity of the switching hysteresis in filamentary-type valence change mechanism devices originates from a temperature- and field-controlled drift-diffusion process of mobile ions, predominantly oxygen vacancies in the switching oxide. Recently, a bipolar resistive switching (BRS) process with opposite polarity, so-called, eight-wise (8w) switching, has been reported that, especially for TiO<SUB>2</SUB> cells, is still not completely understood. Here, we report on nanosized (<0.01 μm<SUP>2</SUP>) asymmetric memristive cells from 3 to 6 nm thick TiO<SUB>2</SUB> films by atomic layer deposition, which reveal a coexistence of c8w and 8w switching in the same cell. As important characteristics for the studied Pt/TiO<SUB>2</SUB>/Ti/Pt devices, the resistance states of both modes are nonvolatile and share one common state; i.e., the high-resistance state of the c8w mode equals the low-resistance state of the 8w-mode. A transition between the opposite hysteresis loops is possible by voltage control. Specifically, 8w BRS in the TiO<SUB>2</SUB> cells is a self-limited low-energy nonvolatile switching process. Additionally, the 8w reset process enables the programming of multilevel high-resistance states. Combining the experimental results with data from simulation studies allows to propose a model, which explains 8w BRS by an oxygen transfer process across the Pt/TiO<SUB>2</SUB> Schottky interface at the position of the c8w filament. Therefore, the coexistence of c8w and 8w BRS in the nanoscale asymmetric Pt/TiO<SUB>2</SUB>/Ti/Pt cells is understood from a competition between drift/diffusion of oxygen vacancies in the oxide layer and an oxygen exchange reaction across the Pt/TiO<SUB>2</SUB> interface.</P> [FIG OMISSION]</BR>
Mehrdad Yazdani-Pedram,Cristian Menzel,Patricio Toro,Raúl Quijada,Alejandro May-Pat,Francis Avilés 한국고분자학회 2013 Macromolecular Research Vol.21 No.2
Multi-walled carbon nanotubes (CNTs) are functionalized with itaconic acid (IA) and its derivative,monomethylitaconate (MMI), to prepare CNT/isotactic polypropylene (PP) composites. To promote dispersion and improved interactions between functionalized CNTs and the PP matrix, PP grafted with IA (PP-g-IA) is employed as a compatibilizer for the preparation of 1% w/w CNT/PP blends by melt compounding. The role of IA as a functionalizing agent for the CNTs and as a compatibilizer for the fabrication of CNT/PP composites is examined. Improved tensile mechanical properties of the composites were obtained when the CNTs were functionalized with IA, although no significant improvement in mechanical properties was observed when PP-g-IA was used as compatibilizer. The use of a compatibilizer, however, retarded the thermal degradation of the composites. Overall, the composites fabricated with IA-functionalized CNTs yielded better mechanical and thermal properties than those composites with CNTs functionalized by MMI, maybe because of the bifunctionalty and higher polarity of IA.
Towards Green 3D-Microfabrication of Bio-MEMS Devices Using ADEX Dry Film Photoresists
Michael Markus Roos,Andreas Winkler,Madeleine Nilsen,Siegfried B. Menzel,Steff en Strehle 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.1
Current trends in miniaturized diagnostics indicate an increasing demand for large quantities of mobile devices for health monitoring and point-of-care diagnostics. This comes along with a need for rapid but preferably also green microfabrication. Dry film photoresists (DFPs) promise low-cost and greener microfabrication and can partly or fully replace conventional silicon- technologies being associated with high-energy demands and the intense use of toxic and climate-active chemicals. Due to their mechanical stability and superior film thickness homogeneity, DFPs outperform conventional spin-on photoresists, such as SU-8, especially when three-dimensional architectures are required for micro-analytical devices (e.g. microfluidics). In this study, we utilize the commercial epoxy-based DFP ADEX to demonstrate various application scenarios ranging from the direct modification of microcantilever beams via the assembly of microfluidic channels to lamination-free patterning of DFPs, which employs the DFP directly as a substrate material. Finally, kinked, bottom-up grown silicon nanowires were integrated in this manner as prospective ion-sensitive field-effect transistors in a bio-probe architecture directly on ADEX substrates. Hence, we have developed the required set of microfabrication protocols for such an assembly comprising metal thin film deposition, direct burn-in of lithography alignment markers, and polymer patterning on top of the DFP.