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( Javid Ali ),( V. Popa ),( M. Imdad ) 호남수학회 2016 호남수학학술지 Vol.38 No.2
In this paper, we utilize an implicit relation to improve and extend some strict common fixed point results of the existing literature to two pairs of hybrid mappings in 2-metric spaces via altering distances. As an application, we also prove some strict common fixed point theorems for hybrid pairs of mappings satisfy- ing a contractive condition of integral type in 2-metric spaces.
Hirian R.,Bortnic R.,Popa F.,Gutoiu S.,Benea D.,Souca G.,Pop V. 한국물리학회 2023 Current Applied Physics Vol.51 No.-
Magnetic filaments for fused deposition modeling, 3d printing, were produced by depositing Nylon12 onto SmCo5/Fe exchange coupled nanocomposites powders by liquid-liquid phase separation and precipitation. The produced filaments have a high coercive filed of 1 T at 300 K. The usefulness of these types of filaments in the production of 3D printed magnets with special stray field geometries was investigated by implementing an evolutionary algorithm capable of generating the appropriately shaped magnet. The desired, calculated and magnet stray field geometries were compared and found to be reasonably similar.
B4C in ex-situ spark plasma sintered MgB2
M. Burdusel,G. Aldica,S. Popa,M. Enculescu,V. Mihalache,A. Kuncser,I. Pasuk,P. Badica 한국물리학회 2015 Current Applied Physics Vol.15 No.10
Powder mixtures of MgB2 and B4C with composition ((MgB2) + (B4C)x, x = 0.005, 0.01, 0.03) were consolidated by Spark Plasma Sintering at 1150 ℃ for 3 min. The average particle size of B4C raw powder was relatively high of 4 mm. Despite this, it is shown that processing processes are fast and, as in the case of the in-situ routes, for our ex-situ method carbon substitutes for the boron in the crystal lattice of MgB2. Specifics of microstructure are discussed based on electron microscopy observations. Carbon substitution and microstructure contribute to enhancement of the critical current density Jc at high magnetic fields and of the irreversibility field Hirr. Samples are shown to be in the point pinning limit with some tendency toward the grain boundary pinning depending on B4C doping amount and temperature. An optimum composition is found for x = 0.01: for this sample, at 20 K, a Jc of 100 A/cm2 is obtained at 5.35 T. This value is higher than for the pristine MgB2 sample and for an optimum ex-situ nano-SiC-doped sample obtained for the same SPS processing conditions.
Jose M. Calderon Moreno,Monica Popa,Steliana Ivanescu,Cora Vasilescu,Silviu Iulian Drob,Elena Ionela Neacsu,Mihai V. Popa 대한금속·재료학회 2014 METALS AND MATERIALS International Vol.20 No.1
The corrosion behavior of a new, advanced Ti-20Zr alloy with α+β microstructure (determined by opticalmicroscopy, XRD, and SEM) and very good mechanical properties (obtained from the stress-strain curve)is studied in this paper. The composition of the alloy native passive film was determined from a XPS analy-sis and the long-term corrosion resistance in undoped and doped states with 0.05M NaF artificial Carter-Brugi-rard saliva of different pH values, simulating the severe functional conditions of a dental implant, was analyzed byelectrochemical methods. This alloy possesses an advantageous balance between good mechanical resis-tance and plasticity and Young’s modulus and exhibits more favorable electrochemical parameters and cor-rosion resistance than CP Ti due to its more resistant passive layer containing Ti2O3, TiO2, and ZrO2 protectiveoxides. After 1000 h of immersion in saliva, the protective properties of the alloy were enhanced due tothe deposited surface layer that incorporated protective phosphates (shown by SEM and XPS).