Zobrazeno 1 - 9
of 9
pro vyhledávání: '"Yoanna KOSTOVA"'
Publikováno v:
Medžiagotyra, Vol 30, Iss 2, Pp 177-182 (2024)
A new amorphous alloy (Al74Cu16Mg10)99,7Zr0.3 was prepared the applying a melt-spinning technique. Temperature dependence of viscosity of the alloy was determined using data from a PerkinElmer TMS2 thermo-mechanical analyzer processed according to a
Externí odkaz:
https://doaj.org/article/b0d3e0c6d94d4a4ea65ba5021556b89a
Autor:
Albena Bachvarova-Nedelcheva, Yoanna Kostova, Lilia Yordanova, Elena Nenova, Pavletta Shestakova, Iliana Ivanova, Elitsa Pavlova
Publikováno v:
Molecules, Vol 29, Iss 11, p 2675 (2024)
The present work deals with the sol–gel synthesis of silica–poly (vinylpyrrolidone) hybrid materials. The nanohybrids (Si-PVP) have been prepared using an acidic catalyst at ambient temperature. Tetramethyl ortosilane (TMOS) was used as a silica
Externí odkaz:
https://doaj.org/article/12fa3aa74dcb46bbbf7da4ebc25c742b
Publikováno v:
Materials, Vol 16, Iss 15, p 5446 (2023)
The effect of copper as a minority alloying element on the corrosion behaviour of amorphous and crystalline Al74Ni16Si10 and Al74Ni15Si9Cu2 alloys was investigated in this study. Amorphous alloys were produced as rapidly solidified ribbons using the
Externí odkaz:
https://doaj.org/article/6023dc434f1b41019e382304101cc7dd
Autor:
Daniela Stoyanova, Irina Stambolova, Vladimir Blaskov, Petya Georgieva, Maria Shipochka, Katerina Zaharieva, Ognian Dimitrov, Pavel Markov, Vanya Dyakova, Yoanna Kostova, Ralitsa Mladenova, George Tzvetkov, Nelly Boshkova, Nikolai Boshkov
Publikováno v:
Applied Sciences, Vol 12, Iss 3, p 1096 (2022)
Zinc oxide arouses considerable interest since it has many applications—in microelectronics, environmental decontaminations, biomedicine, photocatalysis, corrosion, etc. The present investigation describes the green synthesis of nanosized ZnO parti
Externí odkaz:
https://doaj.org/article/2831a1d79a12421bbb82fb2eb900f4e8
Publikováno v:
17TH INTERNATIONAL CONFERENCE ON CONCENTRATOR PHOTOVOLTAIC SYSTEMS (CPV-17).
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::13dfe363c9f20ee4bcff0b0e631c441a
https://doi.org/10.1063/5.0090752
https://doi.org/10.1063/5.0090752
Autor:
Ivanka Spassova, Galia Gentscheva, M. Markova-Velichkova, Ivan Penkov, Diana Rabadjieva, Ch. Tzvetkova, Stoyko Gyurov, Yoanna Kostova, Daniela Kovacheva, Nikolay Marinkov
Publikováno v:
Journal of Sol-Gel Science and Technology. 87:331-339
The formation of silicagel from sodium silicate solution obtained by alkaline autoclave treatment of copper slag was investigated. The influence of the parameters of the gelation process (type of acid used, the pH of the medium, and drying conditions
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6bceae71083d4f8e7f88ef57318f3165
https://doi.org/10.1007/s10971-018-4741-8
https://doi.org/10.1007/s10971-018-4741-8
Autor:
Diana Rabadjieva, Galia Gentscheva, Stoyko Gyurov, Yoanna Kostova, Ivan Penkov, Daniela Kovacheva, Christina Tzvetkova, Nikolay Marinkov
Publikováno v:
International Journal of Mineral Processing. 158:1-7
A technological scheme for copper slag processing is proposed. It comprises 5 stages, namely: (i) air oxidation of the copper slag at a temperature above 800 °C for 2 h; (ii) hydrothermal treatment of the oxidized slag with sodium hydroxide solution
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f426fa16f31cb2c939d39d4b306ada17
https://doi.org/10.1016/j.minpro.2016.11.008
https://doi.org/10.1016/j.minpro.2016.11.008
Publikováno v:
Journal of Thermal Analysis and Calorimetry. 116:945-953
The kinetics of air copper slag oxidation under nonisothermal conditions is studied using simultaneous TG–DTA at a varying heating rate of slag and flow rate of the oxidizing gas flux. The values of the kinetic parameters, activation energy and pre
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2636681b7a7091479a926319c5f0a5d1
https://doi.org/10.1007/s10973-013-3569-2
https://doi.org/10.1007/s10973-013-3569-2
Publikováno v:
Waste Management & Research: The Journal for a Sustainable Circular Economy. 29:157-164
The purpose of this study was to investigate the possibility of separating pyrometallurgical copper (fayalite) slag by oxidation in a synthetic air atmosphere into ferrous and silicate phases suitable for resources to be recovered from them. Isotherm
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::53781cfae2062a24ad05ef07de45e8b1
https://doi.org/10.1177/0734242x10379495
https://doi.org/10.1177/0734242x10379495