75392 research outputs found
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Partially coherent illumination in Fresnel digital holography
No full textscore: 0collation: 59580I.1-59580I.
Control of light collapse in magnetooptical Kerr media
No full textabstractEN: Theoretical and experimental demonstration of light collapse control in magnetooptical bulk Kerr media is presented. The tunable interplay between magnetically induced birefringences is achieved via a combination of the Cotton-Mouton and Faraday effects.score: 3collation: 755-75
LCOS as a reference element in Twyman-Green laser interferometer
No full textabstractEN: Micro-Electro-Mechanical Systems are nowadays frequently used in many fields of industry. The number of their applications increases and their functions become more responsible, therefore precise knowledge about their properties is necessary. Due to its fragility and small sizes non-contact and high sensitive measurement method is required. Two-beam laser interferometry is one of the most popular testing methods of microelements. Such method implemented in Twyman-Green interferometer allows for full-field shape determination and out-of-plane displacement measurement. However the elements under test may bring additional challenges: their surfaces may have complicated shape or large shape gradients which prohibit their testing by means of interferometer with a flat reference mirror. To overcome such problems we propose to use LCOS (Liquid Crystal On Silicon) - phase, reflective SLM as an active reference element. LCOS serves as an adaptive reference mirror and phase shifter. The use of such element allows increasing measurement range of the interferometer and simplifies out-of-plane displacement measurement through object wavefront compensation. The applicability of the modified Twyman-Green interferometer will be shown at the examples of active micromembranes testing.score: 0collation: 61881C-61881
Optical system for investigations of low-cost diffraction gratings
No full textabstractEN: Current development of replication technologies in plastics offers a variety of low-cost diffraction structures. Diffraction grating functionality depends on the designed technical parameters and fabrication procedures. For these reasons a specific knowledge about modeling, fabrication and achieved technical parameters of diffraction gratings are important and need to be tested. In the paper we propose an optical system for determination of global (angles of diffraction, diffraction efficiency) and local (diffracted wavefront quality (PV, RMS)) parameters of linear diffraction gratings. The system combines the capabilities of precise determination of intensity distribution in all existing orders of transmission and reflection type diffraction gratings with full-field measurement (based on grating shearing interferometry) of waverfronts generated by linear gratings. The functionality of the proposed system architecture was proven through exemplary measurements of gratings replicated in PMMA by hot embossing technology.score: 0collation: 667206-66720
Quantum corrections to the ground state energy of inhomogeneous neutron matter
No full textabstractEN: We estimate the quantum corrections to the ground-state energy in neutron matter (which could be termed as well either shell correction energy or Casimir energy) at subnuclear densities, where various types of inhomogeneities (bubbles, rods, plates) are energetically favorable. We show that the magnitude of these energy corrections are comparable to the energy differences between various types of inhomogeneous phases. We discuss the dependence of these corrections on a number of physical parameters (density, filling factor, temperature, lattice distortions).score: 25collation: 695-71
Ranking Procedure for Polymeric Coatings and Hydrophobic Agents for Concrete Protection/Methode zum Klassifizieren von polymeren Beschichtungen und hydrophobierenden Wirkstoffen für den Betonschutz
No full textabstractEN: A ranking procedure, developed by Czarnecki and Lukowski, is applied on a series of concrete protection products. The ranking procedure is applied to evaluate durability experiments, carried out on some commercially available silicone, acrylic and epoxy compounds for surface treatment of concrete. The ranking procedure transforms experimental data of properties into one numerical value, by which the products can be classified according to the way on which their properties present an optimised or even best buy combination. The paper shows the use of the ranking procedure methodology, and points at the importance of the choice of the criteria and of their relative weight factor in the evaluation.score: 0collation: 251-26
Cyclic Steady State Refinement
No full textabstractEN: The paper presents a new modeling framework enabling to evaluate the cyclic steady state of a given system of concurrently flowing cyclic processes (SCCP) on the base of the assumed topology of transportation routes, dispatching rules employed, resources and operation times as well as an initial processes allocation. The objective is to provide the rules useful in the course of routing and scheduling executed in SCCP where local cyclic processes interact on the base of a mutual exclusion protocol.score: 3collation: 191-19
Modernization of Historical Bridges Environmental Aspects
No full textabstractEN: In many countries, old bridges represent a relatively great part of bridge population. Many of them are of bigger or smaller historical value, influencing also the environment. Their utilization is in many cases technically and economically justified. However, they usually require repair, rehabilitation and/or modernization to meet the contemporary traffic conditions. The above operations demand the application of special methods which should be environmentally friendly as well as technically and economically effective for bridge durability. They should also assure the conservation of historical and aesthetical values of the old bridges. All the problems described above have been discussed and exemplified in the paper.score: 0collation: 221-23
Polymeric membrane electrodes with enhanced fluoride selectivity using Zr(IV)-porphyrins functioning as neutral carriers
No full textabstractEN: Poly(vinyl chloride) polymeric membranes plasticized with o-NPOE (o-nitrophenyl octyl ether) or DOS (dibutyl sebacate) and containing Zr(IV)-octaethyl(OEP)- or Zr(IV)-tetraphenylporphyrins (TPP) along with lipophilic cationic additives (tridodecylmethylammonium chloride; TDMACl) are examined potentiometrically and optically with respect to their response toward fluoride. It is shown that these zirconium porphyrins can function as neutral anion carriers within the organic membranes of the electrodes. Spectrophotometric measurements of thin polymeric films indicate that the presence of lipophilic cationic sites in the form of TDMA+ and use of lower dielectric constant plasticizer (DOS) prevents formation of metalloporphyrin dimers in the organic polymer phase, which have been observed previously in polymeric membranes formulated with the same Zr(IV) porphyrins but with lipophilic anion site additives. By preventing dimer formation, rapid and Nernstian potentiometric response of the corresponding membrane electrodes toward fluoride ion is observed. Indeed, electrodes prepared with PVC/DOS membranes containing Zr(IV)-OEP and 15 mol\% of TDMACl (relative to the ionophore) exhibit fast (t95\<15 s) and reversible response toward fluoride. The slope of calibration plots are near-Nernstian (−59.9 mV per decade). Such electrodes display the following selectivity pattern: ClO4−\>SCN−\>F−\>NO3−\>Br−\>Cl−, which differs significantly from the classical Hofmeister series, with greatly enhanced potentiometric selectivity toward fluoride. The data presented herein, coupled with results from a previous study, confirm that Zr(IV) porphyrins can serve as either charged or neutral type anion carriers with respect to their enhanced interactions with fluoride when used as ionophores to prepare liquid–polymeric membrane electrodes, and that the nature of membrane additives and plasticizer dictates the response mechanism at play for given membrane formulations.score: 40collation: 101-10
Exploitation Research of Tram's Head Lighting - Low Beam Lights
No full textscore: 5collation: 477-49