Synthesis and Optical Characteristics of Gd0.96Eu0.01Sm0.01Tb0.01Er0.01Nb0.9Ta0.1O4 Ceramic Solid Solutions Prepared under Different Temperature Conditions

Fine powders of mixed gadolinium tantalum niobates doped with Eu, Sm, Tb, and Er were synthesized. Ceramic samples of polycomponent solid solutions of Gd0.96Eu0.01Sm0.01Tb0.01Er0.01Nb0.9Ta0.1O4 were obtained from synthesized powders using conventional sintering technology. The phase composition and phase structure characteristics of the Gd0.96Eu0.01Sm0.01Tb0.01Er0.01Nb0.9Ta0.1O4 ceramic phases were determined by XRD. The effect of ceramic sintering temperature on the physical characteristics of Gd0.96Eu0.01Sm0.01Tb0.01Er0.01Nb0.9Ta0.1O4 solid solutions is shown. The morphological features of the microstructure of the Gd0.96Eu0.01Sm0.01Tb0.01Er0.01Nb0.9Ta0.1O4 ceramics were studied in relation to its mechanical characteristics. At the same time, the strength characteristics (Young’s modulus, microhardness) and the critical stress intensity factor for mode I KIC were evaluated for the first time for the synthesized compounds. Photoluminescence and cathodoluminescence were studied in the visible region. The study confirms the potential application of Gd0.96Eu0.01Sm0.01Tb0.01Er0.01Nb0.9Ta0.1O4 ceramic solid solutions as scintillators and radioluminescent light sources

Synthesis and Optical Characteristics of Gd_0.96Eu_0.01Sm_0.01Tb_0.01Er_0.01Nb_0.9Ta_0.1O₄ Ceramic Solid Solutions Prepared under Different Temperature Conditions

Fine powders of mixed gadolinium tantalum niobates doped with Eu, Sm, Tb, and Er were synthesized. Ceramic samples of polycomponent solid solutions of Gd0.96Eu0.01Sm0.01Tb0.01Er0.01Nb0.9Ta0.1O4 were obtained from synthesized powders using conventional sintering technology. The phase composition and phase structure characteristics of the Gd0.96Eu0.01Sm0.01Tb0.01Er0.01Nb0.9Ta0.1O4 ceramic phases were determined by XRD. The effect of ceramic sintering temperature on the physical characteristics of Gd0.96Eu0.01Sm0.01Tb0.01Er0.01Nb0.9Ta0.1O4 solid solutions is shown. The morphological features of the microstructure of the Gd0.96Eu0.01Sm0.01Tb0.01Er0.01Nb0.9Ta0.1O4 ceramics were studied in relation to its mechanical characteristics. At the same time, the strength characteristics (Young’s modulus, microhardness) and the critical stress intensity factor for mode I KIC were evaluated for the first time for the synthesized compounds. Photoluminescence and cathodoluminescence were studied in the visible region. The study confirms the potential application of Gd0.96Eu0.01Sm0.01Tb0.01Er0.01Nb0.9Ta0.1O4 ceramic solid solutions as scintillators and radioluminescent light sources

Three-Dimensional (3D) Model-Based Lower Limb Stump Automatic Orientation

Modern prosthetics largely relies upon visual data processing and implementation technologies such as 3D scanning, mathematical modeling, computer-aided design (CAD) tools, and 3D-printing during all stages from design to fabrication. Despite the intensive advancement of these technologies, once the prosthetic socket model is obtained by 3D scanning, its appropriate orientation and positioning remain largely the responsibility of an expert requiring substantial manual effort. In this paper, an automated orientation algorithm based on the adjustment of the 3D-model virtual anatomical axis of the tibia along with the vertical axis of the rectangular coordinates in three-dimensional space is proposed. The suggested algorithm is implemented, tested for performance and experimentally validated by explicit comparisons against an expert assessment

X-ray photoelectron spectroscopy study of interaction of Np5+ with goethite α-FeOOH

Neptunyl NpO2n+ complexes on the surface of goethite α-(FeOOH) resulted from the interaction of neptunyl nitrate (NpO2NO3, 10-6 M) in the aqueous media with the background electrolyte (NaClO4) of ionic force 0.1 M (pH = 7.0 ± 0.2) were formed and studied with the X-ray photo electron spectroscopy. The X-ray photoelectron spectroscopy ionic and elemental quantitative analysis of the goethite and products of its interaction with neptunyl and plutonyl nitrates was carried out. It was established that during the studied neptunyl nitrate - goethite interaction Np4+ and Np6+ com pounds did not to form, while the complexes of neptunyl group NpO21+ containing Np5+ ions with oxygen, water and/or car bon ate ions in the equatorial planes did

38 Nu clear Tech nol ogy & Ra di a tion Pro tec tion –1/2005 X-RAY PHOTOELECTRON SPECTROSCOPY STUDY OF INTERACTION OF Np 5+ WITH GOETHITE a-FeOOH by

n+ com plexes on the sur face of goethite a-(FeOOH) re sulted from the in ter ac tion of neptunyl ni trate (NpO 2NO 3, 10-6 M) in the aque ous me dia with the back ground elec tro lyte (NaClO 4) of ionic force 0.1 M (pH = 7.0 � 0.2) were formed and stud ied with the X-ray pho to elec tron spec tros copy. The X-ray pho to elec tron spec-tros copy ionic and el e men tal quan ti ta tive anal y sis of the goethite and prod ucts of its in ter ac tion with neptunyl and plutonyl ni trates was car ried out. It was es tab lished that dur ing the stud ied neptunyl ni trate – goethite in ter ac tion Np 4+ and Np 6+ com pounds did not to form, while the com plexes of neptunyl group NpO