• Title/Summary/Keyword: Czech

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Development of New Processes for the Decommissioning Decontamination and for Treatment and Disposal of the Secondary Low- and Intermediate-Level Radioactive Waste

  • John, Jan;Bartl, Pavel;Cubova, Katerina;Nemec, Mojmir;Semelova, Miroslava;Sebesta, Ferdinand;Sobova, Tereza;Sul'akova, Jana;Vetesnik, Ales;Vopalka, Dusan
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.19 no.1
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    • pp.9-27
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    • 2021
  • As an example of research activities in decontamination for decommissioning, new data are presented on the options for corrosion layer dissolution during the decommissioning decontamination, or persulfate regeneration for decontamination solutions re-use. For the management of spent decontamination solutions, new method based on solvent extraction of radionuclides into ionic liquid followed by electrodeposition of the radionuclides has been developed. Fields of applications of composite inorganic-organic absorbers or solid extractants with polyacrylonitrile (PAN) binding matrix for the treatment of liquid radioactive waste are reviewed; a method for americium separation from the boric acid containing NPP evaporator concentrates based on the TODGA-PAN material is discussed in more detail. Performance of a model of radionuclide transport, developed and implemented within the GoldSim programming environment, for the safety studies of the LLW/ILW repository is demonstrated on the specific case of the Richard repository (Czech Republic). Continuation and even broadening of these activities are expected in connection with the approaching end of the lifespan of the first blocks of the Czech NPPs.

A Study on the Expressive Characteristics of Czech Cubism's furniture Design - chiefly focusing on mutual relationship with Czech Cubism's painting, craft, and architecture (체코 큐비즘 가구디자인에 나타난 표현특성에 관한 연구 - 회화, 공예, 건축과의 상호연관성을 중심으로 -)

  • Choi Byung Hoon;Kim Jin Woo
    • Korean Institute of Interior Design Journal
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    • v.14 no.3 s.50
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    • pp.165-172
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    • 2005
  • Cubism is a style that led the way to proclaim a new era of 20th century's art and contemporarily had an influence on several trends of thoughts. Geographically it formed Czech Cubism exerting an effect upon thoughts and plastic art of the progressive art group which showed activity around Prague, Czech in 1911, later for 10 years, it was developed as an unique form of which origin cannot be traced inside and outside Europe and expressed its own plastic art world in craft, furniture, painting, architecture, etc. The object of this study is to pull out the expressive characteristics showed especially in furniture design among Czech Cubism around interrelationship with painting, craft and architecture. The scope of study is to bring out the characteristics about the examples which 7 designers such as Josef Gocar, Pavel Janak, etc., who were representative designers of furniture design of Czech Cubism for 15 years from 1910 to 1925. The method of study is to investigate the origin of Czech Cubism by means of primitive elements of Africa, traces of Islamic architectures, and Czech traditional architectural motive, and the development process of Czech Cubism was arranged around the artist and exhibitions which led this current. After being synthesized the characteristics showed in painting, craft, architecture of Czech Cubism on the basis of the result of this study, the expressive characteristics of furniture design of Czech Cubism were brought out. As a result, the expressive characteristics of furniture design of Czech cubism are indicated in a large way as follow; 1) symbolic characteristic based on primitive plastic art, 2) dynamic characteristic by dividing form, 3) ethnic decorative characteristic combined with national motive. The significance of furniture design of Czech Cubism is not only to accept positively and digest the progressive trend of modern art, that is to say, Paris Cubism but also to succeed in recreate it in its own national style, to play a role to offer another motive to post modern design development at the end of 20th century and by means of these examples to provide the necessity and the base of more profound study in the future.

Online training and education from the VR-1 reactor-Lessons learned

  • Ondrej Novak;Tomas Bily;Ondrej Huml;Lubomir Sklenka;Filip Fejt;Jan Rataj
    • Nuclear Engineering and Technology
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    • v.55 no.12
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    • pp.4465-4471
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    • 2023
  • Hands-on education and training is a key part of fixing and developing technology knowledge and is an inherent part of many engineering and scientific curricula. However, access to large complex training facilities, such as nuclear reactor, could be limited by various factors, such as unavailability of those facilities in the region, high traveling costs or harmonization of the schedules of hands-on E&T with theoretical lectures and with the operational schedule of the facility. To handle the issue, several success stories have been reached with the introduction of the Internet Reactor Labs (IRL). The Internet Reactor Labs can strongly contribute to accessibility of training at research reactors and can contribute to improvements in their utilization. The paper describes the development of the Internet Reactor Lab at the VR-1 reactor of the Czech Technical University in Prague. Contrary to single-purpose IRLs, it presents various modalities of online teaching and training in experimental reactor physics and reactor operation in general as well as outreach activities that have been developed in recent years.

GAMMA-SPECTROMETRY IN ENVIRONMENTAL MONITORING OF NUCLEAR POWER

  • Cechak, Tomas;Gerndt, Josef;Kluson, Jaroslav;Musilek, Ladislav;Thinova, Lenka
    • Journal of Radiation Protection and Research
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    • v.26 no.3
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    • pp.203-206
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    • 2001
  • The mathematical processing (unfolding) of pulse height spectra from a scintillation detector helps to calculate the photon fluence rate energy distribution in a measured photon field. The data processing is based on the knowledge of detection system response function and directional dependence respectively. The experimental results of the photon fields measurements in the vicinity of the spent fuel temporary storage and inside the storage hall are presented. The containers Castor 440 are used for temporary storing of the burnt up fuel assemblies in the Czech nuclear power plant Dukovany. A set of periodical measurements was performed in order to get basic information on the time dependence of the photon fields spatial distributions and spectral characteristics in the temporary storage hall and its vicinity. The photon fields were measured by the scintillation system. The obtained photon fields spatial distributions and spectral characteristics present the information on the radiation hazard in the storage.

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Status of Czech Low and Intermediate Radioactive Waste Management in the Context of European Development

  • Trtilek, Radek;Havlova, Vaclava;Podlaha, Josef;Svoboda, Karel;Otcovsky, Tomas
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.19 no.1
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    • pp.29-38
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    • 2021
  • The article summarises the status and competence of UJV Rez, a. s. (up to 2012, the Nuclear Research Institute Rez, Czech Republic) in the field of radioactive waste (RAW) management as a company managing of 95% of institutional radioactive wastes in Czech Republic. UJV Rez a. s. has been one of the Czech Republic's key research and engineering institutions in the field of nuclear energy production since 1955. The company processes and conditions prior to storage 95% of so-called institutional RAW and is the principal partner of the state with respect to the research support of the Czech deep geological repository development project. UJV Rez a. s. boasts its own accredited radiochemical analytical test laboratory, unique of its kind in the Czech Republic. Of equal importance is UJV Rez's active participation in a range of international organisations and associations and its involvement in wide range of international projects, and so as European projects. One of them is EU funded project PREDIS: Pre-disposal management of radioactive wastes, that has started at September 2020, focused on the field of low level radioactive waste (LLW) and intermediate level radioactive waste (ILW) pre-disposal.

Software GNSS Receiver for Signal Experiments

  • Kovar, Pavel;Seidl, Libor;Spacek, Josef;Vejrazka, Frantisek
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • v.2
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    • pp.391-394
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    • 2006
  • The paper deals with the experimental GNSS receiver built at the Czech Technical University for experiments with the real GNSS signal. The receiver is based on software defined radio architecture. Receiver consists of the RF front end and a digital processor based on programmable logic. Receiver RF front end supports GPS L1, L2, L5, WAAS/EGNOS, GALILEO L1, E5A, E5B signals as well as GLONASS L1 and L2 signals. The digital processor is based on Field Programmable Gate Array (FPGA) which supports embedded processor. The receiver is used for various experiments with the GNSS signals like GPS L1/EGNOS receiver, GLONASS receiver and investigation of the EGNOS signal availability for a land mobile user. On the base of experimental GNSS receiver the GPS L1, L2, EGNOS receiver for railway application was designed. The experimental receiver is also used in GNSS monitoring station, which is independent monitoring facility providing also raw monitoring data of the GPS, EGNOS and Galileo systems via internet.

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Design of corrugated sheets exposed to fire

  • Sokol, Zdenek;Wald, Frantisek;Kallerova, Petra
    • Steel and Composite Structures
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    • v.8 no.3
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    • pp.231-242
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    • 2008
  • This paper presents results of fire tests on corrugated sheets used as load bearing structure of roofs of industrial buildings. Additional tests of bolted sheet connections to the supporting structure at ambient and elevated temperatures are described. Three connection types were tested and their resistance, stiffness and deformation capacity was evaluated. Finite element simulations of the corrugated sheet based on the experimental observations are briefly described and design models are presented.

The effect of age, genotype and sex on carcass traits, meat quality and sensory attributes of geese

  • Uhlirova, Linda;Tumova, Eva;Chodova, Darina;Vlckova, Jana;Ketta, Mohamed;Volek, Zdenek;Skrivanova, Vera
    • Asian-Australasian Journal of Animal Sciences
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    • v.31 no.3
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    • pp.421-428
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    • 2018
  • Objective: The aim of this study was to compare carcass traits, meat quality and sensory attributes in two different genotypes of geese according to age and sex. Methods: The experiment was carried out on 160 birds of two genotypes of geese: the Czech Goose (CG) breed and a Eskildsen Schwer (ES) hybrid. One-d-old goslings were divided into four groups according to genotype and sex. Two dates for slaughtering (at 8 and 16 wk of age of goslings) were undertaken. Results: The slaughter weight, cold carcass weight and dressing percentage were affected by all the studied factors, and significant interactions between age, genotype and sex were detected in the slaughter weight (p<0.001) and cold carcass weight (p = 0.004). The pH was not affected by any of studied factors, whereas in terms of meat colour parameters there were observed significant effects of age on $L^*$ and $b^*$ value and a significant effect of sex on $a^*$ value. The meat fat content was higher (p = 0.002) in ES. Higher score for overall acceptance of goose meat was recorded for ES at both ages compared to CG. Conclusion: ES had higher dressing percentage and better sensory attributes, whereas CG exceled in the favourable nutritional value of the meat.