We present a catalog of mean proper motions and membership probabilities individual stars for optically visible open clusters, which have been determined using data from the UCAC4 in homogeneous way. The motion cluster region each were by applying statistical method modified fashion. In this study, we applied global optimization procedure to fit observed distribution with two overlapping normal bivariate frequency functions, also take errors into account. For 724 is first determination...

Silver nanoparticles (AgNPs) exhibit outstanding antimicrobial properties, making them highly valuable in biomedical applications. This study presents the synthesis of a graphene oxide-silver nanoparticle (GO-Ag) nanocomposite via redox chemical reaction, where hydroxyl groups reduced silver ions present oxide (GO). Graphene was obtained through electrochemical exfoliation graphite, followed by ultrasonic presence to form GO-Ag. The materials were characterized using ultraviolet-visible...

Aims. Open clusters are essential tools for understanding Galactic structure, as well stellar evolution, because they distributed over the whole plane, and their ages, distances, reddening can be determined. The values of derived cluster fundamental parameters vary greatly often subjective nature both isochrone fitting technique member star selection. To minimize subjectivity in selection stars to improve procedure, our group has developed a nonparametric method that estimates membership...

In this study, the high energy mechanical milling was utilized to production of duplex stainless steel powders from recycling chips with and without addition niobium carbide. The effect time carbide on morphology, particle size magnetic properties investigated. utilization powder metallurgy constitute an important alternative for reuse waste in industrial sector. realized using a planetary ball mill 20 hours at speed 350 rpm ball-to-powder weight ratio 15:1were used, (0% 3 wt. %) (NbC)...

In the present work, mixed manganese-copper ferrite of composition MnxCu1-xFe2O4 (within x=0.40, 0.42, 0.44, 0.46, 0.48 and 0.50) have been investigated for their electric magnetic properties such as dc resistivity, Curie temperature, saturation magnetization. samples were prepared by uniaxial pressing from oxide mixture, synthesized at 1000°C during 45 hours finally heated to 1200°C 5h, room atmosphere. The X-ray diffractograms show that with different compositions formed compact structure...

The metallicity is a critical parameter that affects the correct determination fundamental characteristics stellar cluster and has important implications in Galactic Stellar evolution research. Fewer than 10 % of 2174 currently catalog open clusters have their determined literature. In this work we present method for estimating via non-subjective isochrone fitting using cross-entropy global optimization algorithm applied to UBV photometric data. free parameters distance, reddening, age,...

We report the results of a statistical analysis performed with four foreground-cleaned Planck maps by means suitably defined local-variance estimator. Our shows clear dipolar structure in Planck's variance map pointing direction (l,b) ≃ (220°,-32°), thus consistent North-South asymmetry phenomenon. Surprisingly, and contrary to previous findings, removing CMB quadrupole octopole makes stronger. show maximal significance, 98.1% CL, scales ranging from ℓ=4 ℓ=500. Additionally, through...

This study presents a new methodology for graphene oxide (GO) synthesis through electrochemical exfoliation of graphite, followed by phthalic anhydride functionalization (PhA-GO) and doping with Cu2+ Ag+ ions. The GO involved the use an cell H2SO4 as electrolyte, gradual increase in potential from 2.3 V to 10 V. Extensive characterization techniques confirmed successful incorporation oxygen-containing functional groups, verifying oxidation graphite. PhA-GO was thermogravimetric analysis,...

Esta pesquisa teve como objetivo avaliar o impacto transdisciplinar de jogos educativos, destacando sua implementação eficaz em diversas disciplinas e níveis escolares. Além disso, buscou estabelecer diretrizes para a adaptação educacional, alinhando as mecânicas dos com objetivos pedagógicos promovendo inovação no desenvolvimento educativos. Baseada nas publicações do ENPEC XIII, enfatizou importância contexto educacional na divulgação científica, evidenciando resultados positivos sala aula...

Due to the increased consumption of raw materials, energy, and waste it generates, recycling has become very important fundamental for environment industrial sector. The production duplex stainless–steel powders with addition vanadium carbide in high energy mechanical milling process is a new method materials manufacture components This study aims reuse chips from UNS S31803 by powder metallurgy Vanadium (VC). was performed using planetary ball mill 50 h at speed 350 rpm ball-to-powder...

The aim of this study was to provide an experimental investigation on the novel method for recycling chips duplex stainless steel, with addition vanadium carbide, in order produce metal/carbide composites from a high-energy mechanical milling process. Powders steel carbide were prepared by ball utilizing planetary mill. For proposal, experiments following full factorial design two replicates planned, performed, and then analyzed. four factors investigated rotation speed, time, powder weight...

We compared the photometric and radiometric quantities in visible, ultraviolet, infrared spectra of white light-emitting diodes (LEDs), incandescent light bulbs a compact fluorescent lamp used for home illumination. The color-rendering index efficiency-related were also as auxiliary tools this comparison. LEDs have better performance all aspects except index, which is with an bulb. Compact lamps presented results that, to our knowledge, do not justify their substitution main contribution...

O presente trabalho analisou os aspectos referentes à aprendizagem dos alunos no decorrer das disciplinas experimentais de física ofertadas durante o período do Regime Tratamento Excepcional (RTE) na Universidade Federal Itajubá (UNIFEI) formato ensino remoto. da pesquisa compreendeu semestres 2020.2 e 2021.1, sendo realizada por meio questionário Google Formulários com regularmente matriculados nos cursos UNIFEI. Participaram estudantes Física Licenciatura, Bacharelado Engenharia Civil. As...