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231 results on '"Novák, Pavel"'

6. The feed push-up as a factor influencing health of dairy cows.

Author

POBORSKÁ, Anna, ROZTOČIL, David, KERNEROVÁ, Naděžda, STRNAD, Ladislav, HAVRDOVÁ, Nikola, TEJML, Petr, BERAN, Jan, NOVÁK, Pavel, MALÁ, Gabriela, VRÁBLÍK, Petr, PETRÁŠKOVÁ, Eva, and ŠOCH, Miloslav

Subjects
DAIRY cattle, SOMATIC cells, MILK quality, MASTITIS, ANIMAL behavior, MILKING
Abstract

Copyright of Journal of Central European Agriculture is the property of Journal of Central European Agriculture and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2024
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9. Synthesis of FeSi–FeAl Composites from Separately Prepared FeSi and FeAl Alloys and Their Structure and Properties.

Author

Novák, Pavel, Duda, Jiří, Průša, Filip, Skotnicová, Kateřina, Szurman, Ivo, and Smetana, Bedřich

Subjects
*IRON, *IRON powder, *MECHANICAL alloying, *TOOL-steel, *SILICON nitride, *IRON composites, *ALLOY powders, *ALLOYS, *CHOLESTERIC liquid crystals
Abstract

Composites consisting of iron aluminide and iron silicide phases were studied in this work. Powders of iron aluminide and iron silicide were prepared by mechanical alloying separately. Subsequently, they were blended in three different proportions and sintered by the SPS method under various conditions. After sintering, the composites are composed of FeAl and amounts of other silicides (Fe5Si3 and Fe3Si). Ternary Fe–Al–Si phases were not determined, even though their presence was predicted by DFT calculations. This disagreement was explained by steric factors, i.e., by differences in the space lattice of the present phases. Hardness and tribological properties were measured on composites with various weight ratios of iron aluminide and iron silicide. The results show that sintered silicides with the matrix composed of iron aluminide reach comparable hardness to tool steels. The composites with higher mass ratios of iron aluminide than silicide have higher hardness and better tribological properties. [ABSTRACT FROM AUTHOR]

Published
2023
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13. The impact of probiotics in the nutrition of calves on live weight gain and on health status.

Author

ZÁBRANSKÝ, Luboš, POLÍVKOVÁ, Denisa, ŠOCH, Miloslav, ŠEBKOVÁ, Anna, BRABENEC, Vojtěch, KERNEROVÁ, Naděžda, MALÁ, Gabriela, NOVÁK, Pavel, GÁLIK, Branislav, HANUŠOVSKÝ, Ondrej, ROLINEC, Michal, MERCY, Umezurike Ngozi, HORŃÁKOVÁ, Ľubica, VALENČÁKOVÁ-AGYASOVÁ, Alexandra, and BUJŃÁK, Lukáš

Subjects
WEIGHT gain, CALVES, SACCHAROMYCES cerevisiae, FEED additives, NUTRITION, LACTOBACILLUS, PROBIOTICS
Abstract

Copyright of Journal of Central European Agriculture is the property of Journal of Central European Agriculture and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2023
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14. The effect of the number of feed pushing-ups on animal behavior, dry matter intake and milk yield of dairy cows.

Author

HAVRDOVÁ, Nikola, ROZTOČIL, David, PETRÁŠKOVÁ, Eva, TEJML, Petr, KERNEROVÁ, Naděžda, POBORSKÁ, Anna, VRÁBLÍK, Petr, NOVÁK, Pavel, MALÁ, Gabriela, ZEVLOVÁ, Eliška, MAURER, Jan, BERAN, JAN, ZÁBRANSKÝ, Luboš, and ŠOCH, Miloslav

Subjects
ANIMAL feeding behavior, DRY matter in animal nutrition, MILK yield
Abstract

Copyright of Journal of Central European Agriculture is the property of Journal of Central European Agriculture and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2023
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15. Improvement in Abrasive Wear Resistance of Metal Matrix Composites Used for Diamond–Impregnated Tools by Heat Treatment.

Author

Cygan-Bączek, Elżbieta, Cygan, Sławomir, Wyżga, Piotr, Novák, Pavel, Lapčák, Ladislav, and Romański, Andrzej

Subjects
HEAT treatment, WEAR resistance, METALLIC composites, MECHANICAL abrasion, FRETTING corrosion, FLEXURAL strength testing, MECHANICAL wear
Abstract

This work presents the possibilities of producing a substitute for a commercial matrix material for sintered metal–diamond tools which is characterized by increased tribological properties required in machining natural stones and concrete. In this study, the improvement in wear behavior of sintered pre-alloyed matrix caused by a thermal treatment was investigated. Several mixtures made of commercially available powders were homogenized by ball milling and consolidated at 900 °C using the spark plasma sintering (SPS) method. During cooling down, the specimens were subjected to isothermal holding at 350 or 250 °C for 1 h. After consolidation, all specimens were tested for density and hardness, whereas selected specimens were characterized by scanning electron microscopy (SEM) and flexural strength tests. The specimens made of BDCM50 powder (a mixture of the base and pre-alloyed powders in 50:50 proportion) shows excellent properties including σ0.2 = 1045 MPa in the three-point bending test and HV10 ≈ 380. Resistance to abrasive wear evaluated in both three-body and two-body conditions in the MWT abrasion test was estimated at A i 3 = 18.1 ± 3.9 μm/20 m and   A i 2 = 95.9 ± 11.8 μm/20 m, respectively. A series of diamond-impregnated specimens (segments) was also produced and tested for wear rate on abrasive concrete. The potential graphitization of the diamond grits was investigated using Raman spectroscopy and X-ray diffraction. As a reference, both the base Fe-Mn-Cu-Sn-C and commercially available Co+20%WC alloy were used to compare selected properties of the investigated materials. It has been proved that heat-treated specimens made of the base mixture modified with pre-alloyed powders are characterized by increased hardness and resistance to abrasive wear. The BDCM50 matrix has a negligible effect on diamond graphitization and shows excellent field performance, which makes it a good potential substitute for replacing Co+20%WC in sintered diamond-impregnated tools. [ABSTRACT FROM AUTHOR]

Published
2023
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16. On estimation of stopping criteria for iterative solutions of gravity downward continuation

Author

Goli, Mehdi, Foroughi, Ismael, and Novák, Pavel

Subjects
Gravity (Force) -- Observations -- Models, Least squares -- Usage, Earth sciences
Abstract

This article discusses methods for selecting criteria used for stopping iterative regularization methods applied to solving continuation of gravity observed at or outside the Earth's surface down to the geoid. This computational step is required for determination of the gravimetric geoid by the Stokes approach. For surface gravity data measured with spatial resolutions at the kilometer level and higher, their downward continuation becomes ill posed and its solution numerically unstable. Two iterative methods often used for solving this problem, namely the Landweber and conjugate gradient least-squares (CGLS) methods, are investigated using a sample of surface gravity data synthesized from a global gravitational model over a mountainous test area in Colorado, USA. Five different commonly used stopping criteria are applied to both iterative methods and neither of them, except L-curve, succeed to stop the iterative process at the reasonable solution. A simple approach is proposed to stop the iterative methods exploiting stochastic properties of surface gravity data. Results of numerical tests suggest that a rather simple stopping criterion based on stochastics parameters of surface gravity data estimated using a leave-one-out cross-validation procedure yields results superior to those based on the L-curve approach which is best performing among the five standard methods for selecting the stopping criterion. Results based on the Landweber method outperform those based on the CGLS method. Iterative methods based on optimum numbers of iterations represent an alternative to commonly used regularization techniques for solving ill-posed inverse problems, such as Tikhonov, that require optimal estimates of regularization parameters. L'article examine les approches de sélection de critères utilisés pour arrêter les méthodes de régularisation itératives appliquées à la résolution du prolongement jusqu'au géoïde de la gravité observée à la surface de la Terre ou en dehors de celle-ci. Cette étape computationnelle est nécessaire pour la détermination du géoïde gravimétrique par l'approche de Stokes. Pour les données de gravité de surface mesurées à des résolutions spatiales kilométriques ou supérieures, leur prolongement vers le bas devient mal posé et sa solution, numériquement instable. Deux méthodes itératives souvent utilisées pour résoudre ce problème, les méthodes de Landweber et des moindres carrées du gradient conjugué (MCGC), sont examinées en utilisant un échantillon de données de gravité de surface synthétisées à partir d'un modèle gravitationnel planétaire sur une région montagneuse expérimentale au Colorado (États-Unis). Cinq critères d'arrêt couramment utilisés sont appliqués aux deux méthodes itératives et aucun d'entre eux, sauf la << L-curve >>, n'arrive à arrêter le processus itératif sur une solution raisonnable. Une approche simple est proposée pour arrêter les méthodes itératives, qui exploite les propriétés stochastiques des données de gravité de surface. Les résultats d'essais numériques portent à croire qu'un critère d'arrêt assez simple reposant sur des paramètres stochastiques des données de gravité de surface estimés en utilisant une procédure de validation croisée de type << leave-one-out >> donne de meilleurs résultats que les critères basés sur l'approche L-curve, la méthode qui, des cinq méthodes standards, performe le mieux pour lasélection de critères d'arrêt. Les résultats basés sur la méthodede Landweber sont meilleurs que ceux basés sur la méthode MCGC. Les méthodes itératives reposant sur des nombres optimaux d'itérations représentent une solutionderechange aux techniquesde régularisation couramment employées pour résoudre des problèmes inverses mal posés, comme celle de Tikhonov, qui requièrent des estimations optimales des paramètres de régularisation. [Traduit par la Rédaction], 1. Introduction Stokes's solution of the gravimetric geoid from surface gravity data requires gravity anomalies to be known on the geoid. Thus, surface gravity values observed at the topography must [...]

Published
2018
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17. Processing of Niobium-Alloyed High-Carbon Tool Steel via Additive Manufacturing and Modern Powder Metallurgy.

Author

Borkovcová, Klára, Novák, Pavel, Merghem, Nawel, Tsepeleva, Alisa, Salvetr, Pavel, Brázda, Michal, and Rajnovic, Dragan

Subjects
*TOOL-steel, *HEAT treatment, *METALLURGY, *POWDER metallurgy, *STRENGTH of materials, *NIOBIUM
Abstract

Niobium is recently considered one of the potential alloying elements for tool steels due to the formation of hard and stable carbides of MC type. Its use is limited by the fact that these carbides tend to coarsen during conventional melting metallurgy processing. This work explores the potential of additive manufacturing for processing Nb-alloyed tool steel with a high content of carbon. Directed energy deposition was used as the processing method. It was found that this method allowed us to obtain a microstructure very similar to that obtained after the use of consolidation via spark plasma sintering when subsequent heat treatment by soft annealing, austenitizing, oil quenching and triple tempering for secondary hardness was applied. Moreover, the soft annealing process could be skipped without affecting the structure and properties when machining would not be required. The hardness of the steel was even higher after additive manufacturing was used (approx. 800–830 HV 30) than after spark plasma sintering (approx. 720–750 HV 30). The wear resistance of the materials processed by both routes was almost comparable, reaching 5–7 × 10−6 mm3N−1m−1 depending on the heat treatment. [ABSTRACT FROM AUTHOR]

Published
2023
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20. EFFECT OF THE NEW TECHNOLOGY OF CATTLE HOUSING WATERBEDS ON COMFORT, HEALTH AND MILK PRODUCTION

Author

Šimková Anna, Šoch Miloslav, Švejdová Kateřina, Zábranský Luboš, Novák Pavel, Brouček Jan, Čermák Bohuslav, Pálka Václav, and Šimák-Líbalová Kristýna

Subjects
dairy cows, double chamber cow waterbeds, cow comfort, health condition, milk production, Food processing and manufacture, TP368-456
Abstract

A new housing technology double-chamber cow waterbeds should provide the animals with greater comfort improve their health and increase milk production. The study was carried out in the stable for dairy cows and heifers. They were stabled in free-stall housing. Rubber mattresses had been replaced with double-chamber cow waterbeds. The aim of the study was to determine their effect on comfort, health, occurrence of mastitis, count of somatic cells, total milk production. The study confirmed the reduction of number of animals with injuries of feet and incidence of mastitis. The values of somatic cells in milk were constant. Positive effect was shown with fluent increase in milk production. It increased the number of cows and heifers lying in the boxes.

Published
2013
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21. UTILIZATION POSSIBILITIES OF PREBIOTICS AND PROBIOTICS IN PREVENTION AND HEALTH CARE OF CALVES

Author

Zábranský Luboš, Šoch Miloslav, Novák Pavel, Brouček Jan, Šimková Anna, Švejdová Kateřina, Čermák Bohuslav, Jirotková Dana, and Pálka Václav

Subjects
calf rumen, dietary supplements, diarrhoea, Food processing and manufacture, TP368-456
Abstract

the aim of our study was to evaluate influence of probiotic agents (Lactovita) and seaweed extracts (Biopolym) with antidiarrheal effects on the prevention of diarrhoea in calves. In the experiment 22 experimental and 22 control calves were observed. The results of the observed incidence of diarrhoea in the control and experimental groups showed a positive effect of probiotic Lactovita and seaweed extracts Biopolymer. 32% of calves in the experimental group and 45% of calves in the control group became sick. Unfortunately, we could not demonstrate the statistical significance of these differences. The weight gains found in the 4th week after birth were by 37.6% higher in the group with Lactovita and Biopolym than in the control group.

Published
2013
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22. MEASURING THE BODY SURFACE TEMPERATURE OF ANIMALS USING A THERMOGRAPHIC CAMERA

Author

Švejdová Kateřina, Šoch Miloslav, Šimková Anna, Zábranský Luboš, Novák Pavel, Brouček Jan, Čermák Bohuslav, Pálka Václav, and Šimák-Líbalová Kristýna

Subjects
body surface temperature, thermographic camera, dairy cows, emissivity, rectal temperature, Food processing and manufacture, TP368-456
Abstract

in this experiment it was used contactless measurement method using a thermographic camera. Surface temperatures were recorded from three different parts of the animal,(the surface of the core body, the eyes and the udde)r. The aim of this study was to determine how much the temperature values that are obtained using the thermographic camera are accurate.. Its accuracy depends on many factors such as particularly good settings of the thermographic camera, a microclimate of environment, an emissivity of measured object, the character and colour of the coat or the degree of muscles. It was also monitor the correlation of the measured surface temperatures with a rectal temperature, which is an indicative of the internal body temperature.

Published
2013
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25. Microstructural Characteristics of Al-Ti-B Inoculation Wires and Their Addition to the AlSi7Mg0.3 Alloy.

Author

Knaislová, Anna, Michna, Štefan, Hren, Iryna, Vlach, Tomáš, Michalcová, Alena, Novák, Pavel, and Stančeková, Dana

Subjects
VACCINATION, ALLOY testing, ALUMINUM alloys, ALLOYS, GRAIN refinement, WIRE
Abstract

Commercially supplied inoculation wires have a guaranteed chemical composition but not the size and distribution of individual phases, which are very important for nucleation. Therefore, two commercial alloys used for the inoculation of Al-Si alloys (AlTi3B1 and AlTi5B1) are investigated in this paper. The emphasis is placed on their structural analysis and the size and distribution of individual intermetallic phases. Furthermore, the grain refinement effect will be tested by adding these alloys to the AlSi7Mg0.3 alloy and testing the optimal amount of added inoculation wires. The results showed that the size and distribution of the individual phases in AlTi3B1 and AlTi5B1 meet the requirements for the successful inoculation of aluminum alloys, the intermetallic phases based on the TiAl3 phase are fine enough, and there is no agglomeration that would reduce the number of nuclei. This assumption was confirmed by adding these inoculants to the AlSi7Mg0.3 alloy, and it was found that the most ideal amount of inoculants added is 0.01 wt % when the structure was refined by approximately 32%. [ABSTRACT FROM AUTHOR]

Published
2022
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27. Automating the creation of channel cross section data from aerial laser scanning and hydrological surveying for modeling flood events / Automatická tvorba geometrie vodních toků na základě syntézy dat z leteckého laserového skenování a hydrologického měření pro modelování povodňových událostí. j. hydrol., hydromech., 60, 2012, 4; 25 lit., 8 obr., 5 tab.

Author

Roub Radek, Hejduk Tomáš, and Novák Pavel

Subjects
aerial laser scanning, cross section, flow rate, gis, hydrodynamic model., letecké laserové skenování, příčný profil, průtok, hydrodynamický model., Hydraulic engineering, TC1-978
Abstract

Znalost rozsahu záplavových území pro jednotlivé N-leté povodňové události a konkrétní povodňové scénáře, včetně získané představy o hloubkách a rychlostech v podélném či příčném profilu vodního toku, které poskytují hydrodynamické modely, zaujímá výsadní postavení z pohledu ochrany životů a zmírnění škod na majetku občanů. Stěžejním faktorem pro tvorbu hydrodynamických modelů jsou vstupní data pro vytvoření výpočetní geometrie vodního toku. Požadavky na vstupní data se liší s ohledem na použitý hydrodynamický model. Jednorozměrné (1D) hydrodynamické modely se vyznačují nižšími požadavky na vstupní data, kdy výpočetní trať je tvořena příčnými profily koryta, naproti tomu u dvourozměrných (2D) hydrodynamických modelů je nutné sestavit pro celé řešené území digitální model reliéfu. S ohledem na vstupní data a použitý model roste i finanční náročnost celého projektu. Nárůst finančních prostředků je způsoben především vysokými náklady na geodetické zaměření koryta toku. Cílem příspěvku bylo ověřit a prezentovat vhodnost využití hydrologického měření při tvorbě schematizace (geometrie) vodních toků na podkladě výškopisných dat získaných metodou leteckého laserového skenování, které zabezpečuje Český úřad zeměměřický a katastrální. Zohlednění hydrologického měření při schematizaci vodního toku do hydrodynamického modelu spočívá v odvození dosaženého průtoku v době pořizování dat metodou leteckého laserového skenování a takto stanovené průtoky lze využít jako podklad pro zahloubení digitálního modelu reliéfu připraveného z dat leteckého laserového skenování. Daný princip tak nahrazuje zbývající část profilu koryta, která není metodou leteckého laserového skenování v digitálním modelu reliéfu reflektována. Je tak dosaženo požadované geometrie koryta vodního toku, jehož kapacita je shodná s hodnotou průtoku v přirozeném korytě.

Published
2012
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30. Heat Treatment of Aluminum Alloys with the Natural Combination of Dopants.

Author

Tsepeleva, Alisa, Novák, Pavel, Kolesnichenko, Evdokim, Michalcová, Alena, Kačenka, Zdeněk, and Kubásek, Jiří

Subjects
*HEAT treatment, *ALUMINUM alloys, *INTERMETALLIC compounds, *SCANNING electron microscopy, *ALLOYS, *FERROMANGANESE, *DOPING agents (Chemistry)
Abstract

Aluminothermic reduction without the separation of individual metals is currently considered as a possible method for processing ferromanganese sea nodules and creating new alloys. In this study, the product of their reduction—a manganese-based polymetallic mixture—was added to pure aluminum, as a mixture of alloying elements in their natural ratios. After extrusion, two new aluminum alloys with a total percentage of metallic additives ranging from 1 to 6 percent were prepared. The possibilities of the precipitation strengthening of these aluminum alloys, especially those containing Mn, Fe, Si, Ni, and Cu, were investigated under a wide range of heat treatment conditions. After each tested combination of annealing and artificial aging temperatures, the phase composition and the microstructure changes were recorded by X-ray diffraction, optical, and scanning electron microscopy with EDS analysis. Under none of the tested heat treatment conditions is a significant hardening effect observed, even though the precipitate phases are observed by TEM. However, the changes in the morphology of the present intermetallic phases caused by the heat treatment are revealed, which highlights the further possible development of these multicomponent alloys. [ABSTRACT FROM AUTHOR]

Published
2022
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37. Possibilities of a Direct Synthesis of Aluminum Alloys with Elements from Deep-Sea Nodules.

Author

Borkovcová, Klára and Novák, Pavel

Subjects
*WEAR resistance, *MECHANICAL wear, *POSSIBILITY, *SINTERING, *MICROHARDNESS
Abstract

This work investigated the possibility of the direct preparation of aluminum alloys by aluminothermic reduction of deep-sea nodules with a high excess of aluminum. The process was found to be unable to obtain aluminum alloy, but an aluminum-rich manganese-based alloy was obtained instead, being composed of intermetallics. The alloy was characterized in the as-reduced state, as well as after crushing and sintering in the temperature range of 800–950 °C. The sample sintered at 900 °C was also heat-treated by annealing at 800 °C for 3 h and rapidly cooled. It was observed that with the increasing sintering temperature, the original matrix phase Al11Mn14 was transformed into a duplex matrix with a structure corresponding to Al11Mn14 and Al4Cu9, and this mixture was further transformed to the matrix with the structure corresponding to Al4Cu9. Furthermore, the mechanical properties and wear resistance of the samples were described. The highest microhardness was reached in the sample, which was annealed after sintering. Sintered samples reached a lower wear rate because of the fragmentation of brittle intermetallics during crushing. [ABSTRACT FROM AUTHOR]

Published
2022
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43. Contributory presentations/posters

Author

Gries, A., Singh, Balwinder, Nakazawal, Chicko, Genest, D., Getzoff, E. D., Matsuo, H., Kaur, Harpreet, Borst, J. W., Chadha, K. C., Tingyun, Kuang, Jagannadham, M. V., Leijon, Mikael, Sato, S., Bhakuni, Vlnod, Vijayan, M., Surolia, A., Suguna, K., Manoj, N., Srinivas, V. R., Ravishankar, R., Laggner, P., Prassl, R., Schwarzenbacher, R., Zeth, K., Kostner, G. M., Taylor, Susan S., Xuong, Nguyen-huu, Akamine, Pearl, Sagar, Bidva M., Saikrishnan, K., Purnapatre, K., Handa, P., Roy, S., Varshney, U., Biswal, B. K., Sukumar, N., Rao, J. K. Mohana, Johnson, A., Pattabhi, Vasantha, Murthy, M. R. N., Krishna, Sri S., Savithri, H. S., Sastri, Mira, Hosur, M. V., Pillai, Bindu, Kannan, K. K., Kumar, Mukesh, Patwardhan, Swati, Padmanabhaa, B., Sasaki-Sugio, S., Matsuzaki, T., Nukaga, M., Singh, T. P., Sharma, A. K., Srinivasan, A., Khan, J. A., Paramasivam, M., Kumar, P., Karthikevan, S., Sharma, S., Yadav, S., Srintvasan, A., Alam, Neelima, Gourinath, S., Kaur, Punit, Chandra, Vikas, Betzel, Ch., Ghosh, S., Bera, A. K., Pal, A. K., Baneriee, Asok, Mukhopadhyay, B. P., Bhattacharya, S., Chakraborty, S., Haldar, U., Dey, I., Solovicova, Adriana, Sevcik, Jozef, Sekar, K., Sundaralingam, M., Genov, N., Liang, Dong-cai, Zhang, Ji-ping, Jiang, Tao, Chang, Wen-rui, Blommers, Marcel, Jahnke, Wolfgang, Hosur, R. V., Panchal, S. C., Pillay, Bindu, Jaganathan, N. R., Mathur, Puniti, Srivatsun, S., Joshi, Ratan Mani, Chauhan, V. S., Govil, Girjesh, Atreya, H. S., Sahu, S. C., Quinjou, Éric, Adjadj, Elisabeth, Mispelter, Joël, Izadi-Pruneyre, Nadia, Blouquit, Yves, Heyd, Bernadette, Lerat, Guilhem, Desmadreil, Michel, Milnard, Philippe, Lin, Y., Rao, B. D. Nageswara, Raghunathan, Vidva, Chau, Mei H., Coutinho, Evans, Pesais, Prashant, Srivastava, Sudha, Saran, Anil, Srikrishnan, Thamarapu, Lijima, Herbert, Gesme, Jayson, Sapico, Leizl F., Paxton, Raymond, Grace, C. R., Nagenagowda, G., Lynn, A. M., Cowsik, Sudha M., Govil, G., Sahu, Sarata C., Bhattacharya, A., Chauhan, S., Kumar, Anil, Zuiderweg, Erik R. P., Pellecchia, Maurizio, Nitta, Katsutoshi, Ohnishi, Atsushi, Kawano, Keiichi, Hikichi, Kunio, Fujitani, Naoki, Ohkubo, Tadayasu, Aizawa, Tomoyasu, Kumaki, Yasuhiro, Hayakawa, Yoichi, Parvathy, Rani V., Kini, R. M., Nakagawa, Astushi, Tanaka, Isao, Demura, Makoto, Yao, Min, Koshiba, Takumi, Kobashigawa, Yoshihiro, Kuwajima, Kunihiro, Linge, Jens, Nilges, Michael, Donoghue, Seán O., Chakshusmathi, G., Ratnaparkhi, Girish S., Madhu, P. K., Varadarajan, R., Tetreau, C., Tourbez, M., Lavalette, D., Bulone, D., Manno, M., Emanuele, A., Palma-Vittorelli, M. B., Palma, M. U., Vaiana, S. M., Martorana, V., Biagio, P. L. San, Chang, D. K., Cheng, S. F., Yang, S. H., Francis, S., Trivedi, V. D., Chien, W. J., Manstein, Dietmar J., Batra, Renn, Geeves, Michael A., Geller, Maciej, Trvlska, Joanna, Grochowski, Pawel, Lesyng, B., Ginalski, K., Grochowski, P., Lavalette, P., Blouquit, Y., Roccatano, D., Berendsen, H. J. C., Amadei, A., Nola, Di A., Ho, Bosco, Curmi, P. M. G., Berry, H., Pelta, J., Pauthe, E., Lairez, D., Srinivasan, M., Sahi, Shakti, Kothekar, V., Madhusudnan, Kartha S., Nandel, Fateh S., Jain, D. V. S., Berendsen, Herman J. C., Feenstra, Anton K., Tama, F., Sanejouand, Y.-H., Go, N., Sharma, Deepak, Pasha, Santosh, Sharma, Sunita, Brahmachari, Samir K., Makker, Jyoti, Viiavaraghavan, R., Kumar, S., Dey, Sharmisllia, Krishnamoorthy, G., Lakshmikanth, G. S., Zaitseva, E. M., Mazhul, V. 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D., Avetisyan, A. V., Feniouk, B. A., Skulachev, V. P., Breyton, Cécile, Kühlbrandt, Werner, Gräslund, Astrid, Assarsson, Maria, Libisch, B., Horváth, G., Gombos, Z., Budagovskaya, N. V., Kudryasheva, N., Fukunishi, Arima, Harada, Erisa, Fukuoka, Yuki, Ohmura, Tomoaki, Kawai, Gota, Watanabe, Kimitsuna, Žekš, Boštjan, Božič, Bojan, Derganc, Jure, Svetina, Saša, Hoh, J. F. Y., Li, Z. B., Rossmanith, G. H., Frederix, P. L. T. M., de Beer, E. L., Treijtel, B. W., Blangè, T., Galtet, F., Hénon, S., Isabey, D., Planus, E., Laurent, V., Rath, L. S., Raval, M. K., Dash, P. K., Ramakrishnan, C., Balaram, R., Basak, Kanika, Balaban, Alexandra T., Nandy, Ashesh, Grunwald, Gregory D., Vracko, Marjan, Randic, Milan, Basak, Subhash C., Amic, Dragan, Beslo, Drago, Trinajstic, Nenad, Nikolic, Sonja, Walahaw, J., Lensink, Marc F. J., Reddy, Boojala V. B., Shindylov, Ilya N., Bourne, Philip E., Grigera, J. R., de Xammar Oro, J., Donnamaria, M. C., Neagu, Monica, Neagu, Adrian, Janežič, Dušanka, Praprotnik, Matej, Nilsson, Lennart, Mark, Pekka, Fata, La L., Dardenne, Laurent E., Werneck, Araken S., Neto, Marçal de O., Kannan, N., Vishveshwara, S., Veluraja, K., Opitz, David, Balasubramanian, Krishnan, Gute, Brian D., Mills, Denise, Lungeanu, Diana, Mihalas, G. I., Macovievici, G., Gruia, Raluca, Dalcin, B., Cortez-Maghelly, C., Passos, E. P., Ljubisavljevic, M., Blesic, S., Milosevic, S., Stratimirovic, D. J., Bachhawat, Nandita, Mande, Shekhar C., Nandy, A., Nishigaki, Koichi, Saito, Ayumu, Naimuddin, Mohammed, Takaesu, Hirotomo, Ono, Mitsuo, Hirokawa, Takatsugu, Eissa, A. M., Ahmed, Abdalla S., El Gohary, M. I., Nakashima, Hiroshi, Raghava, G. P. S., Kurgalvuk, N., Goryn, O., Gerstman, Bernard S., Kratasyuk, V. A., Esimbekova, E. N., Gritsenko, E. V., Remmel, N. N., Maznyak, O. M., German, A., Tikhonov, A., Tchitchkan, D., Koulchitsky, S., Pashkevich, S., Pletnev, S., Kulchitsky, V., Pesotskaya, Y., Shapiro, Erik M., Borthakur, Arijitt, Dimitrov, Ivan, Leigh, John S., Rizi, Rahim, Reddy, Ravinder, Charagundla, Sridhar, Duvvuri, Umamaheswar, Degaonkar, M., Khubchandani, M., Kumar, Mahesh, Jagannathan, N R., Raghunathan, P., Jayasundar, Rama, Coshic, O., Rath, O. K., Julka, P. K., Iliescu, Karina Roxana, Sajin, Maria, Petcu, Ileana, Moisoi, Nicolcta, Kuzmenko, A. I., Donchenko, G. V., Nikolenko, I. A., Morozova, R. P., Rahman, M. K., Ahmed, M. M., Watanabe, Takehiro, Uretzky, G., Ammar, R., Sharony, R., Rubin, Y., Gilboa, H., Mallick, H. N., Kumar, Mohan V., Begum, Gulnaz M., Degaonkar, Mahaveer N., Govindasamy, S., Kumosani, T. A., Lupusoru, C., Titescu, G., Haulica, I., Stefanescu, I., Iliescu, R., Nastasa, V., Bild, W., Khetawat, Gopal, Nealen, M., Faraday, N., Bray, P. F., Noga, S., Lycholat, E. A., Ananieva, T. V., Kosevich, M V., Stepanyan, S. G., Antonyuk, S. V., Khachatryan, A., Kumar, A., Arakelian, H., Khachatryan, R., Agadjanyan, S., Ayrapetyan, S., Mkheyan, V., Rajan, S. S., Kabaleeswaran, V., Gopalakrishnan, Geetha, Govindachari, T. R., Ramrakhiani, Meera, Cullen, David C., Lowe, Phillip, Badley, Andrew, Hermel, H., Möhwald, H., Schmahl, W., Singh, Anil K., Das, Joydip, Majumdar, Nirmalya, Dér, András, Oroszi, László, Kelemen, Loránd, Ormos, Pál, Hámori, András, Ramsden, Jeremy J., Mitra, Chanchal K., Savitri, D., Yanagida, Toshio, Esaki, Seiji, Sowa, Yosiyuki, Nishida, Tomoyuki, Kimura, Yuji, Radu, M., Laukhina, E. E., Kasumova, L. A., Koltover, V. K., Bubnov, V. P., Estrin, Ya. I., Dotta, Rajiv, Zahradník, Ivan, Marko, Milan, Novák, Pavel, Miyata, Hidetake, Hirata, Hiroaki, Sengupta, P., Maiti, S., Balaji, J., Banerjee, S., Barker, A. L., Winlove, C. P., OʼHare, D., Macpherson, J. V., Gonsalves, M., Unwin, P. R., Phillip, R., Kumar, Ravindra G., Murata, K., Nagayaka, K., Danev, R., Sugitani, S., Gősch, Michael, Thyberg, P., Földes-Papp, Z., Björk, G., Blom, H., Holm, J., Heino, T., Inagaki, Fuyuhiko, Yokochi, Masashi, Kusunoki, Masami, Matthews, E. K., Pines, J., Chukova, Yu. P., Koltover, Vitaly K., Kang, B. P. S., Bansal, Geetanjali, Bansal, M. P., Singh, U., Singh, Uma, Nakata, Kotoko, Nakano, Tastuya, Kaminuma, Tsuguchika, Kirn, Bonn, Potocnik, Neja, Stare, Vito, Shukla, Latal, Sastry, M. D., Natarajan, V., Devasagayam, T. P. A., Kesavan, P. C., Sayfutdinov, R., Degermendzhy, A. G., Adamovich, V. V., Rogozin, Yu. D., Khetrapal, C. L., Gowda, G. A. Nagana, Ghimire, Kedar Nath, Masaru, Ishida, Fujita, H., Ishiwata, S., Suzuki, M., Kawahara, S., Kirino, Y., Kishimoto, Y., Mori, H., Mishina, M., Ohshima, H., Dukhin, A. S., Goetz, P. J., Shilov, V. N., and Mishra, R. K.

Published
1999
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44. FRACTURE BEHAVIOR OF FeAlSi INTERMETALLICS.

Author

ČECH, JAROSLAV, HAUŠILD, PETR, KARLÍK, MIROSLAV, NOVÁ, KATEŘINA, PRŮŠA, FILIP, NOVÁK, PAVEL, and KOPEČEK, JAROMÍR

Subjects
INTERMETALLIC compounds, HIGH temperatures, YOUNG'S modulus, SINTERING, NANOINDENTATION
Abstract

The study is devoted to the intermetallic alloy FeAl20Si20 (wt.%) with the potential applications in high temperature aggressive environments. The samples of the same chemical composition were prepared by spark plasma sintering from the different mechanically alloyed powders (pure elements and pre-alloyed powders). Differences in mechanical properties were characterized. Whereas no significant differences were found in hardness and Young's modulus, fracture resistance was higher for the samples from pre-alloyed powders in which Palmqvist and lateral cracks were observed (contrary to the sample made of pure elements where only Palmqvist cracks were identified). [ABSTRACT FROM AUTHOR]

Published
2020
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45. Effect of the lateral topographic density distribution on interpretational properties of Bouguer gravity maps.

Author

Rathnayake, Samurdhika, Tenzer, Robert, Pitoňák, Martin, and Novák, Pavel

Subjects
SPECIFIC gravity, GRAVITY, DENSITY, GEOLOGICAL modeling, TOPOGRAPHY
Abstract

Until recently, the information about the topographic density distribution has been limited to only certain regions and some countries, while missing in the global context. The UNB_TopoDens is the first model that provides the information about a lateral topographic density globally. The analysis of this model also reveals that the average topographic density for the entire continental landmass (excluding polar glaciers) is 2247 kg m−3. This density differs significantly from the value of 2670 kg m−3 that is typically adopted to represent the continental upper crustal density. In this study, we use the UNB_TopoDens density model to inspect how the topographic density variations affect interpretational properties of Bouguer gravity maps. Since this model provides also the information about density uncertainties of individual lithologies (main rock types), we estimate the corresponding errors in the Bouguer gravity data. Despite a new estimate of the average topographic density corresponds to relative changes of ∼16 per cent in values of the topographic gravity correction, these changes do not affect interpretational properties of Bouguer gravity maps. The anomalous topographic density distribution (taken with respect to the average density of 2247 kg m−3), however, modifies the Bouguer gravity pattern. We demonstrate that the gravitational contribution of anomalous topographic density is globally mostly within ±25 mGal, but much large values are detected in Himalaya, Tibet, central Andes and along the East African Rift System. Our estimates also indicate that errors in the Bouguer gravity data attributed to topographic density uncertainties are mostly less than ±15 mGal, but in mountainous regions could reach large values exceeding even ±50 mGal. Unarguably, the UNB_TopoDens model provides an improved information about the global topographic density variations and their uncertainties. Nevertheless, much more in situ measurements of rock density samples together with detailed 3-D geological models are still necessary to understand better the actual density distribution within the whole topography, particularly to mention a density change with depth. [ABSTRACT FROM AUTHOR]

Published
2020
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46. Heat Treatment of Metallic Materials in Modern Industry.

Author

Jurči, Peter and Novák, Pavel

Subjects
*HEAT treatment, *MECHANICAL wear testing, *PHYSICAL vapor deposition, *HEAT treatment of steel, *THIN film deposition
Abstract

The Heat Treatment of Metallic Materials in Modern Industry is a Special Issue of the journal I Materials i , which aims to publish original full-length articles and review papers on basic and applied research centered around the given topic, and thereby make the understanding of the metallurgical background of the contemporary state of heat treatment techniques used in the industrial branches in the 21st century. Finally, the papers on laser- or electron-beam surface treatments as well as the physical vapor deposition of thin films are of interest to the Editors of this Special Issue. The papers which explore the research and development works on bulk heat and cryogenic treatment of steel, aluminium, titanium, magnesium, or copper alloys are particularly welcome. [Extracted from the article]

Published
2022
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47. Galium divaricatum Pourr. ex Lam. (Rubiaceae) -a new species for the flora of Ukraine.

Author

Novák, Pavel and Zukal, Dominik

Subjects
*PHYTOGEOGRAPHY, *GALIUM (Plant genus), *PLANT species, *SPECIES distribution
Abstract

Galium divaricatum Pourr. ex Lam. is an annual plant species occurring mainly in dry grasslands. The centre of its distribution range is situated in the Mediterranean region, while in Central Europe it has been known only from a few isolated sites in Slovakia and Hungary. In 2016 we discovered this species in open dry grassland of the class Sedo-Scleranthetea on the upper edge of a basaltic andesite quarry near the village of Siltse, Irshavskyi District, Zakarpatska Region, as a new species for the Ukrainian flora. The site is situated in the transitional region between the Pannonian Basin and the Eastern Carpathians. The new locality represents the northernmost recent occurrence of this species. [ABSTRACT FROM AUTHOR]

Published
2018
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48. Spectral combination of spherical gravitational curvature boundary-value problems.

Author

Pitoňák, Martin, Eshagh, Mehdi, Šprlák, Michal, Tenzer, Robert, and Novák, Pavel

Subjects
CURVATURE, GRAVITATIONAL energy, MATHEMATICAL models, RANDOM noise theory, STANDARD deviations
Abstract

Four solutions of the spherical gravitational curvature boundary-value problems can be exploited for the determination of the Earth's gravitational potential. In this paper we discuss the combination of simulated satellite gravitational curvatures, that is, components of the third-order gravitational tensor, by merging these solutions using the spectral combination method. For this purpose, integral estimators of biased- and unbiased-types are derived. In numerical studies, we investigate the performance of the developed mathematical models for the gravitational field modelling in the area of Central Europe based on simulated satellite measurements. First, we verify the correctness of the integral estimators for the spectral downward continuation by a closed-loop test. Estimated errors of the combined solution are about eight orders smaller than those from the individual solutions. Second, we perform a numerical experiment by considering the Gaussian noise with the standard deviation of 6.5 × 10−17 m−1 s−2 in the input data at the satellite altitude of 250 km above the mean Earth sphere. This value of standard deviation is equivalent to a signal-to-noise ratio of 10. Superior results with respect to the global geopotential model TIM-r5 (Brockmann et al. 2014) are obtained by the spectral downward continuation of the vertical–vertical–vertical component with the standard deviation of 2.104 m2 s−2, but the root mean square error is the largest and reaches 9.734 m2 s−2. Using the spectral combination of all gravitational curvatures the root mean square error is more than 400 times smaller but the standard deviation reaches 17.234 m2 s−2. The combination of more components decreases the root mean square error of the corresponding solutions while the standard deviations of the combined solutions do not improve as compared to the solution from the vertical–vertical–vertical component. The presented method represents a weight mean in the spectral domain that minimizes the root mean square error of the combined solutions and improves standard deviation of the solution based only on the least accurate components. [ABSTRACT FROM AUTHOR]

Published
2018
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50. Structure and Mechanical Properties of Al-Cu-Fe-X Alloys with Excellent Thermal Stability.

Author

Školáková, Andrea, Novák, Pavel, Mejzlíková, Lucie, Průša, Filip, Salvetr, Pavel, and Vojtĕch, Dalibor

Subjects
*THERMAL stability, *MICROSTRUCTURE, *MICROALLOYING, *METALLIC composites, *MECHANICAL properties of metals
Abstract

In this work, the structure and mechanical properties of innovative Al-Cu-Fe based alloys were studied. We focused on preparation and characterization of rapidly solidified and hot extruded Al-Cu-Fe, Al-Cu-Fe-Ni and Al-Cu-Fe-Cr alloys. The content of transition metals affects mechanical properties and structure. For this reason, microstructure, phase composition, hardness and thermal stability have been investigated in this study. The results showed exceptional thermal stability of these alloys and very good values of mechanical properties. Alloying by chromium ensured the highest thermal stability, while nickel addition refined the structure of the consolidated alloy. High thermal stability of all tested alloys was described in context with the transformation of the quasicrystalline phases to other types of intermetallics. [ABSTRACT FROM AUTHOR]

Published
2017
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