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Polygonal multiresolution topology optimization (PolyMTOP) for structural dynamics
Filipov, Evgueni T.,Chun, Junho,Paulino, Glaucio H.,Song, Junho Springer-Verlag 2016 Structural and multidisciplinary optimization Vol.53 No.4
<P>We use versatile polygonal elements along with a multiresolution scheme for topology optimization to achieve computationally efficient and high resolution designs for structural dynamics problems. The multiresolution scheme uses a coarse finite element mesh to perform the analysis, a fine design variable mesh for the optimization and a fine density variable mesh to represent the material distribution. The finite element discretization employs a conforming finite element mesh. The design variable and density discretizations employ either matching or non-matching grids to provide a finer discretization for the density and design variables. Examples are shown for the optimization of structural eigenfrequencies and forced vibration problems.</P>
Sintering of the mechanically activated MgO-TiO2 system
S. Filipovic 한양대학교 세라믹연구소 2013 Journal of Ceramic Processing Research Vol.14 No.1
Mixtures of MgO-TiO2 powders were mechanically activated in a planetary ball mill for a time interval from 0 to 120 minutes. The influence of the mechanical activation on the phase composition and crystal structure have been analyzed by X-ray diffraction (XRD), while the effect of the activation and sintering process on the microstructure was investigated by scanning electron microscopy (SEM). Using the data obtained from XRD microstructural parameters, the volume averaged crystallite size (D), the density of dislocations (ρD) and the lattice strain (ehkl) values were calculated. Dielectric measurements were performed in order to show the variations in the dielectric constant as a function of the time of mechanical activation.
M. Filipovic,Z. Kamberovic,M. Korac,M. Gavrilovski 대한금속·재료학회 2013 METALS AND MATERIALS International Vol.19 No.3
The objective of this investigation was to set down (on the basis of the results obtained by the examination of white cast iron alloys with different contents of alloying elements) a correlation between chemical composition and microstructure, on one hand, and the properties relevant for this group of materials, i.e.,wear resistance and fracture toughness, on the other. Experimental results indicate that the volume fraction of the eutectic carbide phase (M3C or M7C3) have an important influence on the wear resistance of white iron alloys under low-stress abrasion conditions. Besides, the martensitic or martensite-austenitic matrix microstructure more adequately reinforced the eutectic carbides, minimizing cracking and removal during wear, than did the austenitic matrix. The secondary carbides which precipitate in the matrix regions of high chromium iron also influence the abrasion behaviour. The results of fracture toughness tests show that the dynamic fracture toughness in white irons is determined mainly by the properties of the matrix. The high chromium iron containing 1.19 wt% V in the as-cast condition, showed the greater fracture toughness when compared to other experimental alloys. The higher toughness was attributed to strengthening during fracture, since very fine secondary carbide particles were present mainly in an austenitic matrix.
TV FOOD COMMERCIALS AIMED AT CHILDREN: CONTENT ANALYSIS FROM CULTURAL AND ETHICAL PERSPECTIVES
Jelena Filipovic 글로벌지식마케팅경영학회 2023 Global Marketing Conference Vol.2023 No.07
In the wake of the global pandemic of obesity of the young generation in Europe, with varying prevalence depending on culture and television advertising consumption, the role of marketing communications in the process needs to be re-addressed. Hence, the manner in which the food and beverages are promoted to children in various geographical settings becomes crucial concern for not only parents and teachers, but also society as the whole, represented majorly by regulatory bodies. Previous research within the theme of the correlation between TV advertising and youth obesity have focused on the reaction of children and parents to the advertisements targeting children, mostly disregarding the actual content of the ads, the level of their influence on children and specific context in which this interaction occurs.
SUPERNOVA REMNANTS IN THE MAGELLANIC CLOUDS
BOZZETTO, LUKE M.,FILIPOVIC, MIROSLAV D.,HABERL, FRANK,SASAKI, MANAMI,KAVANAGH, PATRICK,MAGGI, PIERRE,UROSEVIC, DEJAN,STURM, RICHARD The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
We present an ongoing study of the complete sample of supernova remnants (SNRs) and candidates in the Magellanic Clouds. 108 objects in both Clouds are considered to be either SNR or reliable candidates. This represents the most complete sample of all known SNRs in any galaxy. It therefore allows us to study SNR population properties such as the age-diameter (Age-D) relation. Here, we show that this Age-D relation is strongly dependant on the local environment in which SNRs are residing.
Kinetics of Internal Oxidation in Ag-6Sn-2In-1Te-0.2Ni and Ag-6Sn-0.6Cu-1Bi-0.2Ni Type Alloys
Endre Romhanji,Mirjana Filipovic,Zeljko Kamberovic 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.1
Internal oxidation process was followed in Ag-6Sn-2In-1Te-0.2Ni and Ag-6Sn-0.6Cu-1Bi-0.2Ni alloy types in free air and oxygen at 650 °C and 680 °C. It was found that the Cu and Bi bearing alloy had a higher rates of internal oxidation in all of the tested conditions, whish was due to Bi effect accelerating the internal oxidation. In the early stage of internal oxidation of the Ag-6Sn-2In-1Te-0.2Ni alloy, an inhomogeneous structure revealed, which changed to a homogenous pattern after longer oxidation times. Such a structure was suppressed in the Bi bearing alloy. The applied 6 bar oxygen atmosphere brought on a 5-6 times higher rate of internal oxidation, with a homogenous structure compared to the free air oxidation. In free air after long time oxidation (200 h - 250 h), the rate of internal oxidation was found to have almost doubled in both alloys.
Single‐layer and bilayer four‐arm mode 1 spiral antennas and their feed structures
Kim, Kichul,Kefauver, Neill,Buck, Michael,Filipovic, Dejan S. Wiley Subscription Services, Inc., A Wiley Company 2012 International journal of RF and microwave computer Vol.22 No.6
<P><B>Abstract</B></P><P>Single‐layer and bilayer four‐arm spiral antennas and their feeding methods for Mode 1 operation are discussed in this article. Important design parameters such as metal‐to‐slot ratio and growth rate for better impedance matching and reduced far‐field contamination are studied. Three feeding methods for Mode 1 operation are compared: a bundle of four coaxial cables for a single‐layer spiral and vertical and horizontal feeds by two coaxial cables for bilayer spirals. It is shown that the single‐layer spiral maintains beam symmetry with Wobble on Wave better than 1 dB at θ = 30° over 10:1 bandwidth. However, the required beamformer is complex and expensive. Proposed, horizontally and vertically fed bilayer spirals need simpler beamformer while maintaining similar far‐field performance over narrower 6:1 and 2:1 bandwidths, respectively, thus making them useful for many wideband applications. Modeling is conducted by a method of moments and validated with a finite element method and measurements. © 2012 Wiley Periodicals, Inc. Int J RF and Microwave CAE 22: 652–662, 2012.</P>
Jang, Hoyoung,Friemel, G.,Ollivier, J.,Dukhnenko, A. V.,Shitsevalova, N. Yu.,Filipov, V. B.,Keimer, B.,Inosov, D. S. Nature Publishing Group 2014 NATURE MATERIALS Vol.13 No.7
Heavy-fermion metals exhibit a plethora of low-temperature ordering phenomena . Among these are the so-called hidden-order phases that, in contrast to conventional magnetic order, are invisible to standard neutron diffraction experiments. One of the structurally most simple hidden-order compounds, CeB<SUB>6</SUB>, has been intensively studied for an elusive phase that was attributed to the antiferroquadrupolar ordering of cerium-4f moments . As the ground state of CeB<SUB>6</SUB> is characterized by a more conventional antiferromagnetic (AFM) order , the low-temperature physics of this system has generally been assumed to be governed solely by AFM interactions between the dipolar and multipolar Ce moments . Here we overturn this established picture by observing an intense ferromagnetic (FM) low-energy collective mode that dominates the magnetic excitation spectrum of CeB<SUB>6</SUB>. Inelastic neutron-scattering data reveal that the intensity of this FM excitation significantly exceeds that of conventional spin-wave magnons emanating from the AFM wavevectors, thus placing CeB<SUB>6</SUB> much closer to a FM instability than previously anticipated. This propensity for ferromagnetism may account for much of the unexplained behaviour of CeB<SUB>6</SUB>, and should lead to a re-examination of existing theories that have so far largely neglected the role of FM interactions.