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Wyświetlanie 1-14 z 14
Tytuł:
Design of a calculation fem model of the test static set-up of pipe conveyor for analysis of contact forces
Autorzy:
Fedorko, G.
Molnár, V.
Powiązania:
https://bibliotekanauki.pl/articles/102281.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
pipe conveyor
simulation
analysis
contact forces
Opis:
Experimental research in the field of pipe conveyors is a difficult matter and yet necessary in order to answer the questions regarding the motion resistances and contact resistances of pipe conveyors, loading of the conveyor belts etc. These research activities can be performed not only during the actual operation of pipe conveyors, but also by means of the special laboratory test set-ups combined with the application of the computational simulation models. The main task of this paper is to assess the creation of a suitable simulation model of the test set-up for a specified pipe conveyor developed with regard to realisation of the FEM analyses, using the software product Abaqus, as well as presentation of its application possibilities.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 2; 220-225
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of lean manufacturing techniques – SMED analysis to optimization of the production process
Autorzy:
Sabadka, D.
Molnar, V.
Fedorko, G.
Powiązania:
https://bibliotekanauki.pl/articles/957893.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
lean manufacturing
SMED
changeover time
Opis:
Lean is a culture of real and continuous optimization. As a concept of continuous optimization in the midst of limited resources, it must be practiced continuously as a long-term organizational norm. This paper revels why changeover time reduction is important in manufacturing industries and from the various tools and techniques available within Lean manufacturing describes mainly SMED (Single Minute Exchange of Dies) for changeover time reduction and its application in Shaft manufacturing industry. This paper also describes principles, benefits, procedures and practical application of SMED. Theoretical bases are verified in a practical part that describes the analysis and design optimization of non-productive time at changeover honing machine in a selected shaft manufacturing company. The output is the structural design of universal palettes and an evaluation of productivity due to optimization of operations of time honing gear shafts. The results achieved show considerable reduction in delay arising out of machine setting time, batch-setting time and demonstration delay.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 3; 187-195
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optimization of production processes using the Yamazumi method
Autorzy:
Sabadka, D.
Molnár, V.
Fedorko, G.
Jachowicz, T.
Powiązania:
https://bibliotekanauki.pl/articles/102291.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
lean manufacturing
bottlenecks
Yamazumi chart
Opis:
Manufacturing companies are now placing great emphasis on competitiveness and looking for ways to utilise their resources more efficiently. This paper presents optimum efficiency improvement of the automotive transmission assembly production line by using line balancing. 3 assembly stations were selected to optimize where waste management requirements are not met for achieving the production capacity. Several measures were proposed on the assembly lines concerned to reduce operations by using eliminating unnecessary activities of the assembly processes, reducing the cycle time, and balancing manpower workload using line balancing through Yamazumi chart and Takt time. The results of the proposed measures were compared with the current situation in terms of increasing the efficiency of the production line.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 4; 175-182
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Data mining workspace as an optimization prediction technique for solving transport problems
Решение задачи прогнозирования в транспортной отрасли с помощью методов data mining
Autorzy:
Kuptcova, A.
Průša, P.
Federko, G.
Molnár, V.
Powiązania:
https://bibliotekanauki.pl/articles/375552.pdf
Data publikacji:
2016
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
time series prediction
data mining
neural network
modelling
predykcja szeregów czasowych
eksploracja danych
sieć neuronowa
modelowanie
Opis:
This article addresses the study related to forecasting with an actual high-speed decision making under careful modelling of time series data. The study uses data-mining modelling for algorithmic optimization of transport goals. Our finding brings to the future adequate techniques for the fitting of a prediction model. This model is going to be used for analyses of the future transaction costs in the frontiers of the Czech Republic. Time series prediction methods for the performance of prediction models in the package of Statistics are Exponential, ARIMA and Neural Network approaches. The primary target for a predictive scenario in the data mining workspace is to provide modelling data faster and with more versatility than the other management techniques.
В данной статье рассматривается задача прогнозирования временных рядов, которая заключается в построении модели для предсказания будущих событий. В исследовании используются методы интеллектуального анализа данных. Модель прогнозирования позволяет адекватно оценивать исследуемый процесс. Целью исследования является изучение динамики расходов при реализации экспортной продукции. Прогнозирование осуществляется с помощью ARIMA-модели, на основе метода экспоненциального сглаживания и по технологии логической нейронной сети. Построение базового и быстрого сценария прогнозирования является важным и ответственным этапом в научной деятельности.
Źródło:
Transport Problems; 2016, 11, 3; 21-31
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Using traditional ecological knowledge in discovery of rare plants: a case study from Turkey
Autorzy:
Molnar V., A.
Suveges, K.
Molnar, Z.
Loki, V.
Powiązania:
https://bibliotekanauki.pl/articles/56877.pdf
Data publikacji:
2017
Wydawca:
Polskie Towarzystwo Botaniczne
Opis:
Sustainable (and adaptive) management of natural resources is usually based on long term local experiences with nature. Local traditional communities often possess rich ecological knowledge connected to nature and traditional resource use and management. This knowledge can provide unexpected new information for researchers, and show new opportunities and ways for professionals in conserving rare and threatened species. We found significant new populations of the rare Ophrys lesbis in a private area next to the settlement of Çamlık, Muğla, and Orchis punctulata in the graveyard of Kadılar, Antalya with the help of local rural people. We firstly report the replanting of some orchid species (Orchis papilionacea, O. italica, and Barlia robertiana) in kitchen gardens of Çamlık and Bayır, in Muğla Province. The presence of significant orchid populations (e.g., the biggest ever found for Ophrys lesbis) in an area, where local owners have been actively harvesting salep from year to year for decades suggests that the moderate salep harvesting can be sustainable for long run. Based on our observations, Turkish salep harvesters can help botanists and conservationists find new locations of rare threatened orchid populations, and therefore indirectly help in conserve these populations.
Źródło:
Acta Societatis Botanicorum Poloniae; 2017, 86, 3
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chromosome numbers of selected species of Elatine L. (Elatinaceae)
Autorzy:
Kalinka, A.
Sramko, G.
Horvath, O.
Attila Molnar, V.
Popiela, A.
Powiązania:
https://bibliotekanauki.pl/articles/57780.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
polyploid
diploid
chromosome number
plant species
Elatine
Elatinaceae
Opis:
The paper reports chromosome numbers for 13 taxa of Elatine L., including all 11 species occurring in Europe, namely E. alsinastrum, E. ambigua, E. brachysperma, E. brochonii, E. californica, E. campylosperma, E. gussonei, E. hexandra, E. hungarica, E. hydropiper, E. macropoda, E. orthosperma, E. triandra originating from 17, field-collected populations. For seven of them (E. ambigua, E. californica, E. campylosperma, E. brachysperma, E. brochonii, E. hungarica, E. orthosperma) the chromosome numbers are reported for the first time. With these records, chromosome numbers for the whole section Elatinella Seub. became available. Although 2n = 36 was reported to be the most common and the lowest chromosome number in the genus, our data show that out of thirteen species analyzed, six had 36 chromosomes but five species had 54 chromosomes, and the lowest number of chromosomes was 18. These data further corroborates that the basic chromosome number in Elatine is x = 9.
Źródło:
Acta Societatis Botanicorum Poloniae; 2015, 84, 4
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Verifying the prediction result reliability using k-ε, eddy dissipation and discrete transfer models applied on methane combustion using a prototype low-pressure burner
Autorzy:
Honus, S.
Pospíšilík, V.
Jursová, S.
Šmída, Z.
Molnár, V.
Dovica, M.
Powiązania:
https://bibliotekanauki.pl/articles/103231.pdf
Data publikacji:
2017
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
burner
combustion
mathematical modeling
verification
Opis:
The article aims to verify the accuracy of a method to simulate the combustion chamber with a low-pressure prototype burner equipped with a specific “mixing element” and air baffle. The burner has an output of 4 kW and combusts methane. In detail, the article evaluates the accuracy of the final courses of temperatures and CO concentrations in the combustion chamber, which were obtained having combined the mathematical models k-ε, Eddy Dissipation and Discrete Transfer. CFD software CFX was used for the solution and visualisation of the results. The verification measurements imply that the final course of temperature plotted on the vertical axis of the combustion chamber differs from the real course by +21.7% on average. The predicted CO concentrations are relatively satisfactory in the chamber locations with lower temperatures – at the combustion chamber outlet the deviation from the measured value was +31.8%. Overall, the applied method may be considered acceptable to simulate the thermal field in a combustion chamber with the described burner.
Źródło:
Advances in Science and Technology. Research Journal; 2017, 11, 4; 252-259
2299-8624
Pojawia się w:
Advances in Science and Technology. Research Journal
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of industrial metrotomography in the field of maintenance and reliability of rubber-textile conveyor belts in closed continuous transport systems
Wykorzystanie przemysłowego metrotomografu w utrzymaniu i niezawodności taśm przenośnikowych tkaninowo-gumowych w przenośnikach taśmowych z zamkniętą taśmą
Autorzy:
Fedorko, G.
Molnár, V.
Dovica, M.
Husáková, N.
Král' jr., J.
Ferdynus, M.
Powiązania:
https://bibliotekanauki.pl/articles/946069.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Polskie Naukowo-Techniczne Towarzystwo Eksploatacyjne PAN
Tematy:
metrotomography
closed transport systems
conveyor belt
laboratory tests
metrotomografia
zamknięty system transportowy
przenośnik taśmowy
testy laboratoryjne
Opis:
Closed transport systems have been widely implemented in various areas of bulk solid handling because of their advantages. The unique character of these systems stems from the fact that transported material is fully enclosed by a conveyor belt. To ensure their operational reliability and efficient maintenance during operation, processes occurring inside the belt must be monitored. Early damage identification is very important, if not crucial, for reliable functioning of transport systems. One way to do this is by applying the industrial metrotomography method. The paper presents the research methodology of conveyor belt damage using computer metrotomography. It reports the experimental results for two samples: one with a damaged belt matrix and the other with cracks in the upper surface layer of rubber. The damage in the form of puncture of the transporting belt is also described in the paper.
Z powodu swych zalet, systemy transportowe zamknięte, zostały szeroko wprowadzone i zastosowane w różnych dziedzinach transportu materiałów sypkich. Wynika to z unikalnych cech tych systemów, gdzie transportowany materiał jest w pełni otoczony taśmą. Aby zagwarantować niezawodność operacyjną i skuteczną konserwację w trakcie eksploatacji, procesy zachodzące wewnątrz taśmy przenośnikowej muszą być monitorowane. Identyfikacja uszkodzeń we wczesnym stadium, jest bardzo ważna, jeśli nie rozstrzygająca, dla przyszłego niezawodnego funkcjonowania systemu transportowego. Jednym ze sposobów identyfikacji uszkodzeń, jest zastosowanie metody metro-tomografii przemysłowej. W pracy przedstawiono metodykę badań uszkodzeń taśm przenośnikowych tkaninowo- gumowych z wykorzystaniem metro-tomografii. Zaprezentowano wyniki badań doświadczalnych dwóch próbek, gdzie zniszczeniu uległa osnowa taśmy oraz kolejnej, gdzie zaobserwowano pęknięcia w warstwie wierzchniej gumy. Zostało również opisane zniszczenie w postaci przebicia pasa transportowego.
Źródło:
Eksploatacja i Niezawodność; 2016, 18, 4; 539-543
1507-2711
Pojawia się w:
Eksploatacja i Niezawodność
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The phylogenetic position of Vincetoxicum pannonicum (Borhidi) holub supports the species’ allopolyploid hybrid origin
Autorzy:
Horvath, O.
Laczko, L.
Lisztes-Szabo, Z.
Molnar V., A.
Popiela, A.
Sramko, G.
Powiązania:
https://bibliotekanauki.pl/articles/2130712.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
allopolyploidy
concerted evolution
diploidization
gene tree incongruence
hybridization
Pannonian endemism
nrITS cloning
vulnerable species
Opis:
The Pannonian endemic species Vincetoxicum pannonicum was described from specimens collected in Hungary and occurs at only few locations. It is considered “vulnerable” according to the International Red List. The chromosome set was reported to be tetraploid, and the species was hypothesized to be an allotetraploid hybrid of the Balkan species V. fuscatum and the Adriatic species V. hirundinaria subsp. adriaticum. We investigated the origin of V. pannonicum using molecular phylogenetic methods by separately analyzing the multicopy nuclear ribosomal internal transcribed spacer (nrITS) and the plastid-encoded trnH-psbA DNA regions and by evaluating discrepancies between the produced gene trees. Paralogs in the nrITS region clustered in two main groups, one of which was closest to V. fuscatum, and the other included V. hirundinaria subsp. adriaticum. According to trnH-psbA sequences, V. pannonicum and V. hirundinaria subsp. adriaticum formed a single group. Our results show that V. pannonicum diversified because of hybrid speciation, in which V. fuscatum was the pollen donor. We discovered a similar placement of V. maeoticum, which suggests a further hybridization event between V. fuscatum and a species of the V. hirundinaria group. Our genome-size estimate indicates almost sixfold larger genome size in V. pannonicum compared to the maternal diploid parent, suggesting hexaploidy; however, V. pannonicum is tetraploid. This may suggest cytological diploidization in the allopolyploid V. pannonicum. We observed substantial genetic distance between V. hirundinaria subsp. adriaticum and all other subspecies of V. hirundinaria, and we therefore propose that V. adriaticum should be regarded as a separate species.
Źródło:
Acta Societatis Botanicorum Poloniae; 2020, 89, 3
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Production and characterization of tissue cultures of four crocus species from the Carpathian Basin
Autorzy:
Freytag, Csongor
Pabar, Sándor Attila
Demeter, Zita
Simon, Ádám
Resetár, Anna
Molnár V., Attila
Sramkó, Gábor
Máthé, Csaba
Powiązania:
https://bibliotekanauki.pl/articles/952114.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
carpathian basin
organogenesis
embryogenesis
plant regeneration
antioxidant
enzymes
crocus
Opis:
We aimed to produce tissue cultures and plant regeneration from endangered Crocus species: C. scepusiensis, C. tommasinianus, C. vittatus (“Verni” series of the genus) and C. banaticus. For initiation of cultures we used a plant growth regulator (PGR) combination used for in vitro culture of saffron and its relatives: 10 mg L-1 α-naphthaleneacetic acid (NAA) and 1 mg L-1 6-benzyladenine (BA). Shoot tips of young seedlings (C. scepusiensis) and corms (for the rest of species) were used as explants. C. scepusiensis explants developed into organogenic calli. On media with decreased NAA and with or without increased BA concentration, calli produced stigma-like structures and/or shoots and whole plants. In the other species, callus initiation medium induced callus formation with abundant somatic embryos. In C. tommasinianus, embryos developed shoots when auxin content of medium was decreased. In C. banaticus, a decrease of auxin with or without an increase in cytokinin content led to shoot or whole plant regeneration, as in C. scepusiensis. In the case of C. vittatus and C. banaticus, initiation and/or maintenance of cultures on indole-3-butyric acid (IBA) and increased sucrose concentration stimulated whole plant regeneration and in vitro cormlet development. C. scepusiensis and the rest of cultures (organogenic vs. embryogenic) differed at the biochemical level: C. scepusiensis cultures had higher (yet still low) enzymatic antioxidant (catalase, peroxidase) activities. With respect to catalase isoenzyme patterns, C. banaticus was different from the rest of cultures, demonstrating its distinct taxonomical position. Besides germplasm preservation use of the present cultures, they have a potential biotechnological value.
Źródło:
Acta Biologica Cracoviensia. Series Botanica; 2017, 59, 2
0001-5296
Pojawia się w:
Acta Biologica Cracoviensia. Series Botanica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strong potential for endozoochory by waterfowl in a rare, ephemeral wetland plant species, Astragalus contortuplicatus (Fabaceae)
Autorzy:
Lovas-Kiss, A.
Sonkoly, J.
Vincze, O.
Green, A.J.
Takacs, A.
Molnar, A.V.
Powiązania:
https://bibliotekanauki.pl/articles/56900.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
strong potential
endozoochory
waterfowl
rare species
wetland
plant species
Astragalus contortuplicatus
Fabaceae
germination
experiment
mallard
seed dispersal
seed ecology
seed viability
Opis:
It was proposed previously that passive dispersal by migratory aquatic birds explain the widespread distribution of many wetland organisms. Several experimental studies have shown that many widespread wetland plant species can be readily dispersed within the guts of Anatidae. However, it is unclear whether plants with a more restricted distribution are able to disperse via waterbirds. This paper addresses the dispersal ability and germination ecology of the little-known Hungarian milkvetch Astragalus contortuplicatus, which occurs on banks of continental rivers and has a limited and unpredictable distribution. To test whether limited capacity for endozoochory by waterfowl could explain the sporadic appearance of this species, we force-fed ten captive mallards (Anas platyrhynchos) with 100 milkvetch seeds each. Droppings were collected for up to 45 h after feeding. Intact and viable seeds were found in the droppings of each mallard, and altogether 24.7% of seeds fed were recovered intact. The proportion of retrieved seeds that germinated (27.0%) was significantly higher than that of untreated control seeds (0.5%), but significantly lower than that of mechanically scarified seeds (96.0%). Retrieved seeds that germinated developed into healthy mature plants. Given the average flight velocity of mallards, seeds of A. contortuplicatus may travel up to 1600 km inside the digestive tract of migrating individuals. Our results suggest that avian vectors may be more important for the dispersal of rare higher plants (especially those with a hard seed-coat) than hitherto considered. Moreover, they suggest that rarity does not necessarily indicate limited dispersal ability, and may instead be explained by specific habitat requirements.
Źródło:
Acta Societatis Botanicorum Poloniae; 2015, 84, 3
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Development of Monitoring Devices in the „Man-Clothes” System Based on Modern Microcontrollers
Monitorowanie systemu „człowiek-odzież” na bazie nowoczesnych mikrokontrolerów
Autorzy:
Molnar, A.
Gerasimov, V.
Kurytnik, I. P.
Powiązania:
https://bibliotekanauki.pl/articles/274609.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Automatyki i Pomiarów
Tematy:
smart clothes
controller
wireless
elektronika noszona
system „człowiek-odzież”
Opis:
In this paper the design of an experimental sample of a portable electronic device for assessment of the basic parameters of the „Man-Clothes” System based on modern wireless microcontroller technology has been discussed and suggested. The mobile measuring system based on TI MSP430 microcontrollers to track the parameters of “smart clothes” has been presented.
W artykule przedstawiono wyniki badań eksperymentalnych mobilnych urządzeń elektronicznych (wearable) dla monitoringu podstawowych parametrów system „człowiek-odzież” w oparciu o mikrokontroler TI MSP430.
Źródło:
Pomiary Automatyka Robotyka; 2016, 20, 2; 11-15
1427-9126
Pojawia się w:
Pomiary Automatyka Robotyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ordered Structures in a Variable Length A.C. Trap
Autorzy:
Gheorghe, V. N.
Giurgiu, L.
Stoican, O.
Cacicovschi, D.
Molnar, R.
Mihalcea, B.
Powiązania:
https://bibliotekanauki.pl/articles/1968878.pdf
Data publikacji:
1998-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.Pj
Opis:
A variable length linear trap operating between 20-1000 Hz under standard temperature and pressure conditions is reported. We simulated and observed various kinds of stable patterns: linear strings, planar zig-zag and volume structures. The interparticle distances depend on the trapped particle number and trap length. Our setup allows trapped microparticle diagnosis by various methods.
Źródło:
Acta Physica Polonica A; 1998, 93, 4; 625-629
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transmission of second-hand smoke sensitivity and smoking attitude in a family
Autorzy:
Tarnoki, D.L.
Tarnoki, A.D.
Littvay, L.
Lazar, Z.
Karlinger, K.
Molnar, A.A.
Melicher, D.
Garami, Z.
Berczi, V.
Horvath, I.
Powiązania:
https://bibliotekanauki.pl/articles/52085.pdf
Data publikacji:
2014
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2014, 21, 4
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
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