5,624 research outputs found
Iohan Guler von Weineck : Nat. 1562. Denat. 1637. Deo Patrae et Amicis
No full textPorträt von Johann Guler von Weineck (1562-1637)H. Lips sculp.Handschriftliche Notiz auf dem Blatt "Brun, II, 89"Auf Unterlagenblatt und Rückseite des Blattes Nummerierung nach Lips' Inventarisierung übernommen: Nr. 906, Album IIDatierung gemäss Lips' chronologischem Inventa
Neutron Background Predictions and Measurement at ATF2 Beamline
No full textAbstractIn electron machines, neutrons near the interaction region are dominantly produced by photonuclear processes in electromagnetic showers initiated by lost particles in dense materials. The photonuclear cross-section and the high multiplicity of low-energy photons make the low-energy regime vastly dominating this neutron production. ATF2, operating at 1.3GeV, offers most of the phase space to assess the widely used Geant4 toolkit with this respect. The experiment beam dump is used to mimic the above mentioned high density region: the flux of neutron is initiated by the electron beam showering in the dump; which then scatters up to exiting the dump. The measurement of the time dependent flux is sensitive to both the neutron production and transport. Measurements of neutron fluxes performed with plastic and CsI scintillators will presented. They will be compared to a Geant4 simulation of the setup. The simulation makes use of biasing techniques to boost the simulated flux exiting the beam dump which results will be discussed
Structural and ESR studies of Cu‐doped ZnO nanostructures
No full textSurface morphology, structural phases, and electron spin resonance (ESR) measurements were performed for Zn1-xCuxO nanoparticles (x = 0.00, 0.01, 0.02, 0.03, 0.04, and 0.05) synthesized by sol-gel method. The optimum annealing temperature (600 degrees C) and weight loss was clarified using differential thermal analysis (DTA), and thermo gravimetric analysis (TG). By means of X-ray diffraction (XRD) technique, the phase of the samples was defined as single with ZnO wurtzite hexagonal structure and proofed by Rietveld analysis for Zn0.98Cu0.02O sample with calculating c/a rate. Spherical shape random particle distributions were observed in all scanning electron microscope (SEM) measurements. ESR measurements were conducted for all samples and g-value and Delta H (G) values were calculated and correlated from ESR measurements
Optimisation of railway track maintenance and renewal works by genetic algorithms
No full textRad opisuje novi pristup optimizaciji radova na održavanju i remontu željezničkih kolosijeka pomoću genetičkih algoritama. U istraživanju su primijenjeni sustavi za potporu u odlučivanju i genetički algoritmi radi optimizacije radova na održavanju i remontu željezničkih kolosijeka. Rezultati istraživanja su pokazali da je moguće razviti sustav za upravljanje radovima planskog održavanja i remonta te ga uspješno primijeniti umjesto korektivnih radova održavanja.This paper describes a new approach to optimisation of railway track maintenance and renewal works via genetic algorithms. Decision support systems and genetic algorithms are used in this study to optimise railway track maintenance and renewal activities. The results obtained in the scope of this study show that planned maintenance and renewal management systems can be developed and successfully used instead of resorting to corrective maintenance activities
Carbon-silicon composite anode electrodes modified with MWCNT for high energy battery applications
No full textIn this study, we comparatively study the electrochemical characteristics of Si, Si-C and vacuum-assisted filtration fabrication of a novel free-standing Si@C/Mutli Wall Carbon Nanotubes (MWCNT) nanocomposite. The surfaces of the as-received Si nanaoparticles were coated with an amorphous carbon layer and homogenously anchored onto the surfaces of as-received MWCNTs by a simple vacuum filtration method. The samples were then analyzed with field emission scanning electron microscopy and X-ray diffraction (XRD) methods. Si@C/MWCNT samples have shown a stable capacity of 1290 mA h g(-1) after 200 cycles. The results have proven that MWCNT's large surface area, highly conductive network which can provide good contact between Si@C nanoparticles, tolerating large volume change sand suppressing aggregation of Si@C nanoparticles during charge/discharge processes. Such a comparison between the performances of carbon-MWCNT-metal materials is reasonably envisaged not only to be useful for understanding the individual contribution from MWCNT and metal but also to form a fundamental basis for energy storage applications. Free-standing Si-C/MWCNT nano paper has been successfully obtained by a facile vacuum filtration method. (C) 2018 Elsevier B.V. All rights reserved
Secondary transfer effect of contact on solidarity with immigrants: A test of emotion generalization as an alternative mechanism
No full textPresentazione orale al simposio “Host-migrant relations and acceptance of immigrants in novel contexts: An intergroup contact approach
A high-performance composite positive electrode based on graphene and Li (Ni1/3Co1/3Mn1/3)O-2
No full textThe cathode electrodes in commercial Li-ion cells are usually coated on aluminum foils, while the anode part is coated on copper current collector. However, these metallic foils of the electrodes are relatively heavy counterparts when compared with the total cell weight. To overcome this issue, we comparatively studied LiNi1/3Mn1/3Co1/3O2 (NMC); NMC/graphene positive electrodes reinforced with graphene were produced in the form of freestanding electrodes by a facile sol-gel and vacuum filtration method. To confirm our results obtained with the half-cells, graphite@NMC@graphene full-cells were also produced and a specific capacity of 220mAhg(-1) after 250cycles. Extraordinary electrochemical cycling, high conductivity, and enhanced rate properties are obtained by anchoring the NMC particles between the graphene layers. The results have also indicated that the freestanding graphene-based electrodes could be a useful tool for high-capacity lithium-ion batteries
Freestanding graphene/MnO2 cathodes for Li-ion batteries
No full textDifferent polymorphs of MnO2 (α-, β-, and γ-) were produced by microwave hydrothermal synthesis, and graphene oxide (GO) nanosheets were prepared by oxidation of graphite using a modified Hummers’ method. Freestanding graphene/MnO2 cathodes were manufactured through a vacuum filtration process. The structure of the graphene/MnO2 nanocomposites was characterized using X-ray diffraction (XRD) and Raman spectroscopy. The surface and cross-sectional morphologies of freestanding cathodes were investigated by scanning electron microcopy (SEM). The charge–discharge profile of the cathodes was tested between 1.5 V and 4.5 V at a constant current of 0.1 mA cm−2 using CR2016 coin cells. The initial specific capacity of graphene/α-, β-, and γ-MnO2 freestanding cathodes was found to be 321 mAhg−1, 198 mAhg−1, and 251 mAhg−1, respectively. Finally, the graphene/α-MnO2 cathode displayed the best cycling performance due to the low charge transfer resistance and higher electrochemical reaction behavior. Graphene/α-MnO2 freestanding cathodes exhibited a specific capacity of 229 mAhg−1 after 200 cycles with 72% capacity retention
Track degradation analysis in the scope of railway infrastructure maintenance management systems
No full textStanje elemenata željezničke infrastrukture ključni je faktor koji utječe na sigurnost prometa, raspoloživost infrastrukture, ukupne troškove radova na održavanju i remontu, kao i prihode. Mjerenje i analiza stanja elemenata željezničke infrastrukture je jedini ispravan pristup kako bi se na učinkovit način pratilo njihovo ponašanje te planirali radovi na održavanju. U radu se opisuje optimalna struktura sustava za upravljanje održavanjem željezničke infrastrukture (Railway Maintenance Management System - RMMS) s posebnim osvrtom na primjenu modela degradacije kao jednog od ključnih dijelova RMMS-a.The condition of railway infrastructure elements is the key factor influencing the traffic safety, infrastructure availability, total maintenance and renewal costs, and revenues. The measurement and analysis of the condition of railway infrastructure elements is the only correct approach enabling an efficient monitoring of their behaviour and proper planning of maintenance activities. An optimum structure of the railway Maintenance Management System - RMMS is presented in the paper, with a special emphasis on the utilization of deterioration models, as one of the RMMS’s key components
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