Search results for: M. Černík

Items from 1 to 20 out of 23 results

article

Optimization and Design of a New Torpedo Lining

Vladimir Petrov, R. Hirjak, D. Chudíková, V. Mišaneková, more

Interceram - International Ceramic Review > 2018 > 67 > 6 > 14-21

One of the basic requirements of current industrial processes is to extend the service life of metallurgical aggregates taking into consideration the maximum economic effectiveness. Torpedoes are essential components of the supply system during transportation of hot metal from the blast furnace to the steel shop area. The development of high-quality and up-to-date refractories while harmonizing their...

article

Major advances and challenges in heterogeneous catalysis for environmental applications: A review

S. Wacławek, V. V. T. Padil, M. Černík

Ecological Chemistry and Engineering. S > 2018 > Vol. 25, nr 1 > 9--34

Heterogeneous catalysis is one of the fastest developing branches of chemistry. Moreover, it is strongly connected to popular environment-related applications. Owing to the very fast changes in this field, for example, numerous discoveries in nanoscience and nanotechnologies, it is believed that an update of the literature on heterogeneous catalysis could be beneficial. This review not only covers...

article

Structural Parameters of Functional Membranes for Integration in Smart Wearable Materials

M. Eldessouki, T. Aysha, M. Ratičáková, J. Šašková, more

Fibres & Textiles in Eastern Europe > 2017 > Vol. 25, no. 5 (125) > 73--78

Smart clothes can be described as textiles that change their behavior under some external factors (stimulants). The response of the smart cloth can be passive (just as a sensor) or active (where a combination of sensing and another reaction takes place). The materials involved in these textiles are crucial for many applications, especially for health related applications where the “wearables” can...

article

Activation process of air stable nanoscale zero-valent iron particles

D. Ribas, M. Černík, J.A. Benito, J. Filip, more

Chemical Engineering Journal > 2017 > 320 > C > 290-299

Nanoscale Zero Valent Iron (nZVI) represents a promising material for subsurface water remediation technology. However, dry, bare nZVI particles are highly reactive, being pyrophoric when they are in contact with air. The current trends of nZVI manufacturing lead to the surface passivation of dry nZVI particles with a thin oxide layer, which entails a decrease in their reactivity. In this work an...

article

The Effect of Cryo-Rolling and Annealing on Magnetic Properties in Non-Oriented Electrical Steel

T. Kvačkaj, P. Bella, R. Bidulský, R. Kočiško, more

Acta Physica Polonica A > 2017 > 131 > 4 > 1105-1107

The goal of the present work is to compare progressive technology - rolling at cryogenic temperature and classical rolling at ambient temperature followed by an investigation of their impact on the final microstructure and the magnetic properties of non-oriented electrical steel. Non-oriented electrical steel is characterized by high magnetic induction, low magnetic losses, and low coercivity. The...

article

TiO2 immobilised on biopolymer nanofibers for the removal of bisphenol A and diclofenac from water

E. Kudlek, D. Silvestri, S. Wacławek, V. V. T. Padil, more

Ecological Chemistry and Engineering. S > 2017 > Vol. 24, nr 3 > 417--429

Recently electrospinning has gained significant attention due to unique possibilities to produce novel natural nanofibers and fabrics with controllable pore structure. The present study focuses on the fabrication of electrospun fibres based on gum karaya (GK), a natural tree gum, with polyvinyl alcohol (PVA), and functionalization of the membrane with TiO2 nanoparticles with further methane plasma...

article

Use of various zero valent irons for degradation of chlorinated ethenes and ethanes

S. Wacławek, J. Nosek, L. Cádrová, V. Antoš, more

Ecological Chemistry and Engineering. S > 2015 > Vol. 22, nr 4 > 577--587

Amongst all of the reducing agents that can be used in environmental remediation, zero valent iron (ZVI) is one of the most common due to its environmental acceptance, high reaction rate, good availability, and long-term stability. Moreover, ZVI mobility, stability and reactivity can be enhanced by the application of a DC electric current, ie electrokinetics (EK). In the study, six various slurries...

article

Degradability of chlorophenols using ferrate(VI) in contaminated groundwater

M. Homolková, P. Hrabák, M. Kolář, M. Černík

Environmental Science and Pollution Research > 2016 > 23 > 2 > 1408-1413

The production and use of chlorophenolic compounds in industry has led to the introduction of many xenobiotics, among them chlorophenols (CPs), into the environment. Five CPs are listed in the priority pollutant list of the U.S. EPA, with pentachlorophenol (PCP) even being proposed for listing under the Stockholm Convention as a persistent organic pollutant (POP). A green procedure for degrading such...

article

Improvements in nanoscale zero-valent iron production by milling through the addition of alumina

D. Ribas, M. Cernik, V. Martí, J. A. Benito

Journal of Nanoparticle Research > 2016 > 18 > 7 > 1-11

A new milling procedure for a cost-effective production of nanoscale zero-valent iron for environmental remediation is presented. Conventional ball milling of iron in an organic solvent as Mono Ethylene Glycol produces flattened iron particles that are unlikely to break even after very long milling times. With the aim of breaking down these iron flakes, in this new procedure, further milling is carried...

article

Green Synthesis: Nanoparticles and Nanofibres Based on Tree Gums for Environmental Applications

V. V. T. Padil, S. Wacławek, M. Černík

Ecological Chemistry and Engineering. S > 2016 > Vol. 23, nr 4 > 533--557

The recent advances and potential applications of nanoparticles and nanofibres for energy, water, food, biotechnology, the environment, and medicine have immensely conversed. The present review describes a ‘green’ method for the synthesis and stabilization of nanoparticles and ‘green electrospinning’ both using tree gums (arabic, tragacanth, karaya and kondagogu). Furthermore, this review focuses...

article

Chemical degradation of PCDD/F in contaminated sediment

P. Hrabák, M. Homolková, S. Wacławek, M. Černík

Ecological Chemistry and Engineering. S > 2016 > Vol. 23, nr 3 > 473--482

Due to the extreme toxicity of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/F), the remediation of PCDD/F aquifer source zones is greatly needed; however, it is very difficult due to their persistence and recalcitrance. The potential degradability of PCDD/F bound to a real matrix was studied in five systems: iron in a high oxidation state (ferrate), zero-valent iron nanoparticles (nZVI),...

article

Simple spectrophotometric determination of monopersulfate

S. Wacławek, K. Grübel, M. Černík

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy > 2015 > 149 > Complete > 928-933

A simple, sensitive and accurate spectrophotometric method has been developed and validated for the determination of monopersulfate (MPS) which is an active part of potassium monopersulfate triple salt that has the commercial name – Oxone. This work proposes a spectrophotometric determination of monopersulfate based on modification of the iodometric titration method. The analysis of absorption spectra...

article

The influence of thermomechanical processing conditions on magnetic properties of electrical steels

P. Bella, T. Kvačkaj, M. Černík, M. Lupták, more

Hutnik, Wiadomości Hutnicze > 2015 > Vol. 82, nr 8 > 510--514

The paper deals with the influence of thermomechanical treatment on properties of non-oriented electrical steels processed at cryogenic and ambient temperature. The main objective of research was to determine the effect of annealing conditions on magnetic properties in samples processed by rolling at cryogenic temperature. From customers‘ point of view, there are high demands on the magnetic properties...

article

Arsenic immobilization by nanoscale zero-valent iron

A. Rodová, J. Filip, M. Černík

Ecological Chemistry and Engineering. S > 2015 > Vol. 22, nr 1 > 45--59

Contaminated mine water from the Kank site (Czech Republic) containing arsenic at a concentration of approximately 85 mg/dm3 was tested in a reaction with elemental iron nanoparticles. In a reductive environment there was a reduction of As to the more soluble and toxic form of As(III) depending on the pH of the solution. Oxidation of elemental iron creates oxyhydroxides which incorporate As into their...

article

The alternatives to percutaneous endoscopic gastrostomy using pull method

P. Kohout, Z. Antoš, G. Puškárová, M. Rozmahel, more

Nutrition > 2013 > 29 > 11-12 > 1435

article

In-Situ Combination of Bio and Abio Remediation of Chlorinated Ethenes

L. Lacinová, M. Černíková, J. Hrabal, M. Černík

Ecological Chemistry and Engineering. S > 2013 > Vol. 20, nr 3 > 463--473

This article deals with combined abio-bioreductive methods for in-situ removal of chlorinated ethenes. The method is based on the use of bioremediation supported by lactate and chemical reduction using nZVI. The method is compared with the use of the individual methods alone, mainly with nZVI. In an environment with very low permeability a poor contaminant removal efficiency was achieved during repeated...

article

P245 PERCUTANEOUS ENDOSCOPIC GASTROSTOMY IN NEUROLOGICAL DISEASES

P. Kohout, Z. Antos, G. Puskarova, M. Rozmahel, more

Clinical Nutrition Supplements > 2009 > 4 > 2 > 128

article

P.3.06 High-frequency repetitive transcranial magnetic stimulation and its influence on negative symptoms of schizophrenia

L. Ustohal, R. Prikryl, T. Kasparek, S. Skotakova, more

European Neuropsychopharmacology > 2007 > 17 > Supplement 1 > S74

article

Influence of chemistry and hot rolling conditions on high permeability non-grain oriented silicon steel

J. Huňady, M. Černík, E.J. Hilinski, M. Predmerský, more

Journal of Magnetism and Magnetic Materials > 2006 > 304 > 2 > e620-e623

This paper discusses the influence of chemical composition on the final electromagnetic properties in higher permeability material. Furthermore, the effect of the hot rolling practice and the end of austenite transformation temperature range on the hot band microstructure is described. The magnetic polarization J ₅₀₀₀ better than 1.7T, using hot rolling conditions 40mm transfer bar thickness,...

article

OCVD carrier lifetime in P+NN+ diode structures with axial carrier lifetime gradient

V. Benda, M. Cernik, V. Papez

Microelectronics Journal > 2006 > 37 > 3 > 217-222

The OCVD (open circuit voltage decay) method is the generally used method for the determining of carrier lifetime in the structures of semiconductor devices. This paper is focused on power diode (P ⁺ NN ⁺ ) structures, in which is realised a carrier lifetime gradient to influence the current and voltage waveforms during the reverse recovery process. A theoretical analysis of the general...

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INFONA - science communication portal

Search results for: M. Černík

Optimization and Design of a New Torpedo Lining

Major advances and challenges in heterogeneous catalysis for environmental applications: A review

Structural Parameters of Functional Membranes for Integration in Smart Wearable Materials

Activation process of air stable nanoscale zero-valent iron particles

The Effect of Cryo-Rolling and Annealing on Magnetic Properties in Non-Oriented Electrical Steel

TiO2 immobilised on biopolymer nanofibers for the removal of bisphenol A and diclofenac from water

Use of various zero valent irons for degradation of chlorinated ethenes and ethanes

Degradability of chlorophenols using ferrate(VI) in contaminated groundwater

Improvements in nanoscale zero-valent iron production by milling through the addition of alumina

Green Synthesis: Nanoparticles and Nanofibres Based on Tree Gums for Environmental Applications

Chemical degradation of PCDD/F in contaminated sediment

Simple spectrophotometric determination of monopersulfate

The influence of thermomechanical processing conditions on magnetic properties of electrical steels

Arsenic immobilization by nanoscale zero-valent iron

The alternatives to percutaneous endoscopic gastrostomy using pull method

In-Situ Combination of Bio and Abio Remediation of Chlorinated Ethenes

P245 PERCUTANEOUS ENDOSCOPIC GASTROSTOMY IN NEUROLOGICAL DISEASES

P.3.06 High-frequency repetitive transcranial magnetic stimulation and its influence on negative symptoms of schizophrenia

Influence of chemistry and hot rolling conditions on high permeability non-grain oriented silicon steel

OCVD carrier lifetime in P+NN+ diode structures with axial carrier lifetime gradient

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