Autor: Roth, S. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Survey of Industrial Applications of Conducting Polymers
Autorzy:: Roth, S.
Graupner, W.
McNeillis, P.
Tematy:: 72.80.Le
81.90.+c
89.20.+a; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1932275.pdf Link otwiera się w nowym oknie
Opis:: Seventeen years after the first publication of doped polyacetylene we have already seen the appearance and disappearance of commercial products based on conducting polymers. In the present report we want to summarize the status quo in this field paying attention to existing products, laboratory demonstration set-ups and promising concepts.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Influence of Oxygen Impurities on Electrical Properties of Fullerene C$\text{}_{60}$
Autorzy:: Rabenau, T.
Roth, S.
Kremer, R. K.
Tematy:: 72.20.Jv
72.80.Le
72.20.-i; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1933397.pdf Link otwiera się w nowym oknie
Opis:: We present high temperature dc, ac and contactless microwave conductivity results on solid-state C$\text{}_{60}$ (films and crystals) from room temperature up to 850 K. Heating pristine samples, which were exposed to the ambient atmosphere, under dynamic vacuum at first leads to a reduction of the electrical resistance and finally, above ≈700 K, to an increase in the resistance. The decrease is ascribed to oxygen desorption and the increase to the chemical reactivity of residual chemisorbed oxygen with the C$\text{}_{60}$ host molecules, respectively. Samples, annealed above 800 K, display a reversible temperature dependence of the resistance. The high temperature regime of their resistance exhibits an activated behaviour with an universal activation energy of 2E$\text{}_{a}$ = 1.85 ± 0.04 eV for crystals and films, which is identical to the HOMO-LUMO splitting of the C$\text{}_{60}$-molecules.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Influence of Ball Milling on the Local Atomic Structure of an Amorphous CoFeSiB Alloy
Autorzy:: Bednarcik, J.
Michalik, S.
Kollar, P.
Roth, S.
Tematy:: 61.43.Dq
61.05.cp
64.70.dg
75.30.Kz; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1534068.pdf Link otwiera się w nowym oknie
Opis:: It follows from experimental observations that ball milling induces substantial changes in an amorphous $Co_{70.3}Fe_{4.7}Si_{10}B_{15}$ (at.%) alloy. X-ray diffraction indicates formation of nanocrystalline bcc-(Co,Fe) phase during ball milling. As a consequence crystallization sequence is altered and the total enthalpy of crystallization reduces with the milling time. Furthermore thermomagnetic measurements reveal that specific magnetization and Curie temperature of amorphous phase are influenced by ball milling.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Soft Magnetic Properties in Bulk Permalloy Alloys Fabricated by a Warm Consolidation
Autorzy:: FŰzer, J.
Kollár, P.
Olekšáková, D.
Roth, S.
Tematy:: 75.50.Bb
81.20.Ev
75.60.Ej; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1813525.pdf Link otwiera się w nowym oknie
Opis:: Soft magnetic properties of bulk NiFe and NiFeMo alloys consolidated by hot compaction were studied. During annealing the compacts residual stresses diminish by relaxation and soft magnetic properties improve. The lowest coercivity of bulk NiFe and NiFeMo alloys are 11. 0 and 11. 2 A/m, respectively, while the total losses are 1. 81 and 1. 42 W/g at f=10 kHz and $B_\text{max}$ =0. 2 T.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Rectification in Fullerene (C$\text{}_{60}$)-Phthalocyanine Thin Film Sandwich Structures
Autorzy:: Anderson, T.
Akselrod, L.
Fischer, C. M.
Roth, S.
Tematy:: 73.40.Ei
73.61.Ph
73.40.-c; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1933395.pdf Link otwiera się w nowym oknie
Opis:: Bilayer sandwich structures were fabricated by the sequential thermal evaporation of gold, copper phthalocyanine (CuPc), C$\text{}_{60}$ and gold onto sapphire substrates. When the current-voltage characteristics of a freshly made device are measured in an atmosphere of argon, fairly strong rectification is observed. When the bilayer device is exposed to ammonia vapor, the rectification slowly decreases and almost disappears. If the device is then placed under vacuum and the ammonia removed, the initial conditions slowly return. We attribute the rectification to the formation of a p-n junction.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Magnetic Properties of Crystalline NiFe Alloy Prepared by High-Energy Ball Milling and Compacting
Autorzy:: Olekšáková, D.
Kollár, P.
Füzer, J.
Bednarčík, J.
Roth, S.
Tematy:: 75.50.Bb
81.20.Wk
75.50.Vv
75.60.Ej
75.60.-d; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1533970.pdf Link otwiera się w nowym oknie
Opis:: The structure and magnetic properties of compacted microcrystalline NiFe (81 wt% of Ni) powder is investigated. The powder of NiFe alloy prepared by ball milling of ribbon (prepared by melt spinning) remains single phase material suitable for compaction in order to prepare soft magnetic material. The bulk samples were consolidated by uniaxial compaction of the powder in vacuum. By measuring of AC and DC magnetic properties it was found out that in bulk samples the displacement of domain walls is the dominant magnetization process, while rotation of magnetization vectors prevails in powder material.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: The Soft Magnetic Properties and Temperature Stability of Co-Fe-Zr-B Metallic Glasses
Autorzy:: Bednarčík, J.
Kováč, J.
Roth, S.
Fűzer, J.
Kollár, P.
Varga, L.
Franz, H.
Tematy:: 75.50.Kj; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1813531.pdf Link otwiera się w nowym oknie
Opis:: In the present work multicomponent Co-based alloys with nominal composition $Co_{72-x}Fe_xZr_8B_{20}$ (x=10, 15, and 20 at. %) were synthesized by single-roller melt-spinning. The measurement of coercivity, $H_c$, reveals the soft magnetic behavior of investigated alloys. The value of $H_c$ increases from 23 A/m for alloy with x=10 at. % up to 32 A/m for alloy with x=20 at. %. Further it was found that crystallization temperature of as-quenched alloys slightly varies with iron content and lays between 605 and 625°C. From the temperature dependence of magnetization it follows that partial substitution of cobalt by iron has positive influence on the Curie temperature of amorphous phase, $_cT^{am}$, which increases from 300°C up to 462°C for alloy with x=10 at. % and x=2 0 at. %, respectively.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Fabrication and Characterization of Hybrid Tunnel Magnetoresistance Structures with Embedded Self-Assembled Nanoparticle Templates
Autorzy:: Siffalovic, P.
Majkova, E.
Chitu, L.
Halahovets, Y.
Jergel, M.
Senderak, R.
Luby, S.
Weis, M.
Satka, A.
Szymański, B.
Stobiecki, F.
Timmann, A.
Roth, S.
Tematy:: 61.05.cf
61.46.Df; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1810565.pdf Link otwiera się w nowym oknie
Opis:: We report on an incorporation of self-assembled templates of superparamagnetic Fe-O nanoparticles into tunnel magnetoresistance devices. We fabricated a multilayer stack composed of the following layer sequence: Cr/Au/Co/NP/Co/Cu on Si(100) substrate where NP stands for a self-assembled layer of nanoparticles deposited by the Langmuir-Blodgett technique. The X-ray reflectivity and grazing-incidence small angle X-ray scattering were employed to study the layers thicknesses and interface morphology in each preparation step. In particular, the grazing-incidence small angle X-ray scattering was measured before and after the nanoparticle incorporation as well as on the complete tunnel magnetoresistance stack. In this way, in-depth morphology profile during subsequent preparation steps was obtained. We demonstrate that X-ray analysis of the deposited tunnel magnetoresistance stack is essential for successful fabrication of novel hybrid devices consisting of self-assembled nanoparticles.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Improving Student Outcomes through the Well Designed use of Computer Technology in University Business Classes
Autorzy:: Swenson Roth, Wendy
S. Butler, Deborah
Tematy:: classroom technology
improved learning outcomes
course delivery and structuring
skill development; Pokaż więcej
Wydawca:: Uniwersytet Ekonomiczny w Poznaniu
Powiązania:: https://bibliotekanauki.pl/articles/557699.pdf Link otwiera się w nowym oknie
Opis:: This study examines improving student learning outcomes through a structured approach to technology utilization in the design of the course. A process was developed to actively integrate laptops into two Business Intelligence classes where numerous software applications were introduced in order to build student skills with analysis. In addition the implications of a teaching lab with uniform hardware and software versus the variety that results when students bring their own laptops is also considered. Results showed students’ evaluations of the process was positive and some significant improvements in skill development over the previous semester resulted. Insights and suggestions are explored.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Intermittency and Deformation Band Propagation in an Austenitic FeMnC TWIP Steel
Autorzy:: Lebyodkin, M.
Lebedkina, T.
Roth, A.
Allain, S.
Tematy:: 62.20.F-
81.70.-q
05.65.+b
62.65.+k; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1418489.pdf Link otwiera się w nowym oknie
Opis:: Plastic deformation of austenitic FeMnC TWIP steels exhibits complex spatiotemporal patterns associated with the occurrence of deformation bands and the concomitant fluctuations of the deforming stress. Although the plastic instability is a generic property of these steels and is usually attributed to interaction of dislocations with solutes (the Portevin-Le Chatelier effect), both the kinematics of the deformation bands and the characteristic shape of stress serrations observed in the carbon-containing TWIP steel at room temperature manifest unusual features. The nature of these peculiarities and the mechanism of jerky flow in such steels are unclear. In the present work, an attempt is made to get an insight into the jerky flow in the Fe22Mn0.6C steel by studying the time series characterizing the evolution of plastic deformation at various scales: stress-time curves, local strain field, and acoustic emission accompanying the deformation processes. Stress and strain fluctuations related to two distinct scale ranges are detected and characterized.
Dostawca treści:: Biblioteka Nauki

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