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Selective Leaching as a Method of Metallic Nanoparticles Preparation
Michalcová, A.; Vojtěch, D.; Kubatík, Tomáš František; Marek, I.; Svobodová, P.; Novák, P.
2014 - anglický
Selective leaching is process used mainly in analytical praxis–alloy matrix is dissolved and the residuum can be study by different methods. In this article, modification of selective leaching determined for production of metallic nanoparticles is described.Selective leaching technique lays in preparation of supersaturated solid solution of desired element in matrix metal –by convenient heat treatment or by rapid solidification of the binary alloy. Consequently, the matrix metal is selectively dissolved and metal nanoparticles from other metal are formed. The size, shape and agglomeration of forming metallic nanoparticles are dependent on many factors such as reaction temperature, concentration of leaching solution, additives present in leaching solution. The metal mainly used as matrix component is aluminium due to is amphoteric behaviour. It enables aluminium dissolution in sodium hydroxide without affecting the minor metal. Nobel metals like silver or copper forms
Klíčová slova:
Nanocrystaline materials; selective leaching
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Selective Leaching as a Method of Metallic Nanoparticles Preparation
Selective leaching is process used mainly in analytical praxis–alloy matrix is dissolved and the residuum can be study by different methods. In this article, modification of selective leaching ...
Global Power Balance in Non-Stationary Discharge Phases in the COMPASS Tokamak
Havlíček, Josef; Imríšek, Martin; Kovařík, Karel; Weinzettl, Vladimír
2014 - anglický
The global power balance between different input power and sink/loss channels is important for understanding of tokamak physics, particularly for various scaling laws. The power balance is measured easily during stationary discharge phases because the terms for both magnetic field energy and plasma thermal energy build-up can be neglected. However, many important events in tokamak plasmas occur during non-stationary phases of the discharge. This article describes, quantifies and discusses the terms of the global power balance, including time dependent parts, and exemplifies them on the typical ohmic discharge of the COMPASS tokamak.
Klíčová slova:
tokamak; global power balance; power through separatrix; COMPASS
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Global Power Balance in Non-Stationary Discharge Phases in the COMPASS Tokamak
The global power balance between different input power and sink/loss channels is important for understanding of tokamak physics, particularly for various scaling laws. The power balance is measured ...
SIEMENS ‘FLYEYE‘ prototype lens results within a project 3SU1
Doleček, Roman; Melich, Radek; Macner, David
2014 - anglický
The aim of this study is to design and prototype a lens that enable a decrease of the light intensity that radiate into forward direction (90°) and at the same time increase the FWHM of the irradiated pattern.
Klíčová slova:
Flyeye lens; illumination
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
SIEMENS ‘FLYEYE‘ prototype lens results within a project 3SU1
The aim of this study is to design and prototype a lens that enable a decrease of the light intensity that radiate into forward direction (90°) and at the same time increase the FWHM of the irradiated ...
Witness sample of M1 protrusion
Melich, Radek; Psota, Pavel; Rail, Zdeněk; Franců, Helena; Hadincová, Ivana
2014 - anglický
Development of the technological process of M1 protrusion witness samples with a characteristic surface strength > 70MPa and realization of technology demonstrators.
Klíčová slova:
M1 protrusion; characteristic strength; METIS
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Witness sample of M1 protrusion
Development of the technological process of M1 protrusion witness samples with a characteristic surface strength > 70MPa and realization of technology demonstrators.
Microroughness of the superpolished coated sample
Melich, Radek; Kovačičinová, Jana; Lédl, Vít; Matoušek, Ondřej; Pintr, Pavel; Pleštil, Jan; Polák, Jaroslav; Possolt, Martin; Procháska, František; Psota, Pavel; Rail, Zdeněk; Tomka, David; Vít, Tomáš
2014 - anglický
This document describes a test of microroughness change after coating of the representative sample of the METIS mirror surface with respect to microroughness.
Klíčová slova:
microroughness; coating; METIS
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Microroughness of the superpolished coated sample
This document describes a test of microroughness change after coating of the representative sample of the METIS mirror surface with respect to microroughness.
Silicon carbide for chemical application prepared by SPS method
Brožek, Vlastimil; Kubatík, Tomáš František; Vilémová, Monika; Mušálek, Radek; Mastný, L.
2014 - anglický
Silicon carbide discovered more than 121 years ago has a wide usage in the mechanical engineering industry as well as in electrical engineering.It is an excellent abrasive medium as well as a construction material with high resistance to mechanical and chemical deterioration.Under standard condition, silicon carbide has no melting point (decomposes at 2700 °C – principle used for industrial production of silicon),thus the bulk form must be prepared in a composite form with a metallic, ceramic or polymer binder. This method is suitable for tailoring of mechanical properties; nevertheless,it does not produce SiC form applicable for laboratory purposes.Binder-free sintering of SiC is practically impossible, despite decreased chemical resistivity of the produced material. Pure SiC is insoluble in all acids except hydrofluoric acid.Reaction of SiC with HF is enabled only due to residual SiO2 created during the industrial production.However, SiO2 located between the planes of growth of SiC
Klíčová slova:
silicon carbide; spark plasma sintering; silicon carbide corrosion; impurities in silicon carbide
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Silicon carbide for chemical application prepared by SPS method
Silicon carbide discovered more than 121 years ago has a wide usage in the mechanical engineering industry as well as in electrical engineering.It is an excellent abrasive medium as well as a ...
Analysis and synthesis of optical performance of given material
Kovačičinová, Jana; Pintr, Pavel
2014 - anglický
Development of measurement process of optical performance of given material
Klíčová slova:
measurement; optical performance
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Analysis and synthesis of optical performance of given material
Development of measurement process of optical performance of given material
METIS – Design report - mirrors
Lédl, Vít; Melich, Radek; Psota, Pavel; Steiger, Lukáš; Vít, Tomáš; Kovačičinová, Jana
2013 - anglický
The presented study shows results from the mechanical design of M1 and M2 mirrors for METIS/ICOR. The study compares the material properties of different materials, which are often used for manufacturing of
Klíčová slova:
METIS; lightweighted mirrors; low microroughness
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
METIS – Design report - mirrors
The presented study shows results from the mechanical design of M1 and M2 mirrors for METIS/ICOR. The study compares the material properties of different materials, which are often used for ...
Planar acoustic metamaterials with the active control of acoustic impedance using a piezoelectric composite actuator
Nováková, Kateřina; Mokrý, P.; Václavík, J.; Marton, P.; Cernik, M.; Psota, Pavel; Doleček, Roman; Lédl, Vít
2013 - anglický
In the Paper, there are presented methods for a precise active control of the acoustic impedance of large planar structures, e.g glass plates or shells, by means of distributed flexible piezoelectric composite actuators which are connected to passive or active electronic shunt circuits. Design of tunable acoustic metamaterials is realized using Finite Element Method simulations and their acoustic properties are evaluated using acoustic transmission loss measurements. Static and dynamic displacements of the metamaterials produced by electric voltage are measured using Digital Holographic Interferometry. We believe that deep understanding of presented systems should result in future applications that improve the quality of everyday life.
Klíčová slova:
Planar acoustic metamaterials; Active control of acoustic impedance; Piezoelectric composite actuator
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Planar acoustic metamaterials with the active control of acoustic impedance using a piezoelectric composite actuator
In the Paper, there are presented methods for a precise active control of the acoustic impedance of large planar structures, e.g glass plates or shells, by means of distributed flexible piezoelectric ...
Illumination study of 3SU1 project
Melich, Radek; Vojtíšek, Petr; Mach, M.
2013 - anglický
This document provides report of results obtained during measurement of Siemens 3SU1 PLCompact, 3SU1 PLModular nad PCB indicators and their comparison to 3SB3 and Allan Bradley pilot lights.
Klíčová slova:
angular radiation measurement
Plné texty jsou dostupné na jednotlivých ústavech Akademie věd ČR.
Illumination study of 3SU1 project
This document provides report of results obtained during measurement of Siemens 3SU1 PLCompact, 3SU1 PLModular nad PCB indicators and their comparison to 3SB3 and Allan Bradley pilot lights.
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