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Search Results: 1 - 10 of 400732 matches for " M. Niesler "
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Wastes from the coal-enrichment process as alternative reducers for lead smelting from lead-acid accmulator scrap
J. Lipart,T. Matu?a,M. Niesler,L. Blacha
Metalurgija , 2013,
Abstract: In the paper, results of the study on a possible utilization of coal-enrichment wastes as alternative reducers for lead smelting from acid-lead accumulator scrap are presented. For the experiments, the following alternative carboniferous reducers were selected: coal slurry, anthracite dust and coal soot. The investigations included both laboratoryscale experiments and semi-industrial tests in a rotary furnace. The findings allowed for a review of the effects of a sample type (loose material or material post a preliminary agglomeration process), loaded into the furnace, on a final process yield.
A study on the process of fine-grained plumbiferous material agglomeration
M. Niesler,L. Blacha,J. ?abaj,T. Matu?a
Metalurgija , 2013,
Abstract: In the paper, results of a study on the agglomeration process of fine-grained plumbiferous materials, belonging to basic resources for lead recovery, are presented. For the agglomeration tests, a laboratory drum granulator and a balling disc were utilized. The obtained granules were tested for compression strength with the use of a so-called Michaelis testing device as well as for drop strength, determined per the standards. The results allowed for evaluating the effects of the composition of the blend of materials subjected to agglomeration on the quality of obtained granules.
Research of electrical conductivity of synthetic powders
A. Sorek,P. Popielska-Ostrowska,M. Niesler
Archives of Materials Science and Engineering , 2012,
Abstract: Purpose: This paper describes the electrical conductivity of liquid phase powders and laboratory research of electrical conductivity of synthetic powders.Design/methodology/approach: Research of electrical conductivity of liquid synthetic slag was performed using voltmeter-ammeter method on the specially designed research stand.Findings: The electrical conductivity of slag depends on the chemical composition of the liquid slag, which is related to their ionic structure. The electrical conductivity is determined by the dimensions of the ions, their number and mobility as a function of the viscosity of the liquid in which they are.Research limitations/implications: Laboratory studies of electrical conductivity of liquid powders should be the basis for further studies crystallizer powders used in continuous casting conditions.Practical implications: The chemical composition of powders (ion) can cause changes in the lubrication conditions in the near-meniscus zone in continuous casting mold and can influence on the surface quality on the continuous casting ingots.Originality/value: This paper presents the result of research of electrical conductivity CaO-SiO2-Al2O3-FeO-MgO-K2O powders.
Dust arising during steelmaking processes
P. Popielska-Ostrowska,J. Siwka,A. Sorek,M. Niesler
Journal of Achievements in Materials and Manufacturing Engineering , 2012,
Abstract: Purpose: This paper describes the dust arising during steelmaking processes.Design/methodology/approach: Steelmaking dusts may be a viable alternative for obtaining valuable and widely used metal which is zinc. On the other hand, heavy metals, it was as dangerous to the environment, and this in turn means that development of steelmaking dusts in the best possible way.Findings: The analysis of the formation of steelmaking dust.Research limitations/implications: Understanding the mechanism of steelmaking dusts will help to increase the participation of zinc recycling from wastes.Practical implications: Contained zinc in the dust can be recovered from the positive economic effect, and neutralization of hazardous waste to the desired environmental effect.Originality/value: Description of the mechanism of steelmaking dust, with particular emphasis on the distribution of zinc. The information is very important in the development of metal recovery technology from waste.
User Profiling in Intelligent Tutoring Systems Based on Myers-Briggs Personality Types
Andrzej Niesler,Gracja Wydmuch
Lecture Notes in Engineering and Computer Science , 2009,
Broadband terahertz generation from metamaterials
Liang Luo,Ioannis Chatzakis,Jigang Wang,Fabian B. P. Niesler,Martin Wegener,Thomas Koschny,Costas M. Soukoulis
Physics , 2014, DOI: 10.1038/ncomms4055
Abstract: The terahertz spectral regime, ranging from about 0.1 to 15 THz, is one of the least explored yet most technologically transformative spectral regions. One current challenge is to develop efficient and compact terahertz emitters/detectors with a broadband and gapless spectrum that can be tailored for various pump photon energies. Here we demonstrate efficient single-cycle broadband THz generation, ranging from about 0.1 to 4 THz, from a thin layer of split-ring resonators with few tens of nanometers thickness by pumping at the telecommunications wavelength of 1.5 micrometer (200 THz). The terahertz emission arises from exciting the magnetic-dipole resonance of the split-ring resonators and quickly decreases under off-resonance pumping. This, together with pump polarization dependence and power scaling of the terahertz emission, identifies the role of optically induced nonlinear currents in split-ring resonators. We also reveal a giant sheet nonlinear susceptibility $\sim$10$^{-16}$ m$^2$V$^{-1}$ that far exceeds thin films and bulk non-centrosymmetric materials.
Diffractive rho^0 photo- and leptoproduction at high energies
G. Niesler,G. Piller,W. Weise
Physics , 1996, DOI: 10.1016/S0370-2693(96)01237-3
Abstract: We discuss the elastic photo- and leptoproduction of rho^0-mesons from nucleons at Q^2 < 1 GeV^2 as studied in recent experiments at HERA and FNAL. We find that the mass distribution of the measured \pi^+\pi^- pairs is determined to a large extent by the two-pion contribution to the photon spectral function as given by the pion form factor. With rising Q^2 the rate of diffractive events decreases and the \pi^+\pi^- mass distribution approaches a symmetric shape.
Diffractive Phenomena and Shadowing in Deep-Inelastic Scattering
G. Piller,G. Niesler,W. Weise
Physics , 1997, DOI: 10.1007/s002180050348
Abstract: Shadowing effects in deep-inelastic lepton-nucleus scattering probe the mass spectrum of diffractive leptoproduction from individual nucleons. We explore this relationship using current experimental information on both processes. In recent data from the NMC and E665 collaboration, taken at small x << 0.1 and Q^2 < 1 GeV^2, shadowing is dominated by the diffractive excitation and coherent interaction of low mass vector mesons. If shadowing is explored at small x << 0.1 but large Q^2 >> 1 GeV^2 as discussed at HERA, the situation is different. Here dominant contributions come from the coherent interaction of diffractively produced heavy mass states. Furthermore we observe that the energy dependence of shadowing is directly related to the mass dependence of the diffractive production cross section for free nucleon targets.
Simple silicone chamber system for 3D skeletal muscle tissue formation
Celia Snyman,Kyle P. Goetsch,Kathryn H. Myburgh,Carola U. Niesler
Frontiers in Physiology , 2013, DOI: 10.3389/fphys.2013.00349
Abstract: Bioengineering skeletal muscle often requires customized equipment and intricate casting techniques. One of the major hurdles when initially trying to establish in vitro tissue engineered muscle constructs is the lack of consistency across published methodology. Although this diversity allows for specialization according to specific research goals, lack of standardization hampers comparative efforts. Differences in cell type, number and density, variability in matrix and scaffold usage as well as inconsistency in the distance between and type of adhesion posts complicates initial establishment of the technique with confidence. We describe an inexpensive, but readily adaptable silicone chamber system for the generation of skeletal muscle constructs that can readily be standardized and used to elucidate myoblast behavior in a three-dimensional space. Muscle generation, regeneration and adaptation can also be investigated in this model, which is more advanced than differentiated myotubes.
Metamaterial metal-based bolometers
Fabian B. P. Niesler,Justyna K. Gansel,Sarah Fischbach,Martin Wegener
Physics , 2012, DOI: 10.1063/1.4714741
Abstract: We demonstrate metamaterial metal-based bolometers, which take advantage of resonant absorption in that a spectral and/or polarization filter can be built into the bolometer. Our proof-of-principle gold-nanostructure-based devices operate around 1.5 \mum wavelength and exhibit room-temperature time constants of about 134 \mus. The ultimate detectivity is limited by Johnson noise, enabling room-temperature detection of 1 nW light levels within 1 Hz bandwidth. Graded bolometer arrays might allow for integrated spectrometers with several octaves bandwidth without the need for gratings or prisms and for integrated polarization analysis without external polarization optics.
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