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    Wyświetlanie 1-9 z 9
    Tytuł:
    Quantifiable differences between phytolith assemblages detected at species level: analysis of the leaves of nine Poa species (Poaceae)
    Autorzy:
    Lisztes-Szabo, Z.
    Kovacs, S.
    Balogh, P.
    Daroczi, L.
    Penksza, K.
    Peto, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/57352.pdf
    Data publikacji:
    2015
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    phytolith assemblage
    silica body
    epidermis
    species level
    analysis
    leaf
    Poa
    Poaceae
    Opis:
    The taxonomie value of phytolith assemblages and their degree of variability within different species of the same genus is still an undervalued issue in the botanical range of phytolith studies. However the understanding of grass phytolith variance and its implications to plant systematics is doubtless. In the present study phytoliths of the lateral shoots (leaves) of nine, globally distributed Poa species (Pooideae - Poaceae) are described. Phytoliths were recovered from Poa specimens by the dry ashing technique. Altogether 6223 disarticulated phytoliths were counted (approximately 500-700 phytoliths per species) in 54 plant samples, which cover six shoots of nine species. Not only the relative frequency of each morphotype was calculated, but measurements were conducted to determine the biogenic silica content of Poa lateral shoots. A phytolith reference collection for the nine selected species of a worldwide importance was also compiled. The description of the most significant phytolith morphotypes and their taxonomic relationships are given here. Results suggest that the biogenic silica content of the Poa lateral shoots was determined to be relatively high within all nine species. Phytolith assemblage data was subjected to multivariate statistical analyses (e.g., CA and PCA) in order to find differences and similarities among the nine Poa species. Results show that the two closely related Poa of the P. pratensis species group, namely the P. pratensis and P. angustifolia, only slightly differ from the other Poa species if we consider their rondel-trapeziform short cells (SC) phytolith frequencies.
    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:
    Facility layout redesign for efficiency improvement and cost reduction
    Autorzy:
    Kovacs, G.
    Kot, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/122482.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
    Tematy:
    facility layout
    layout redesign
    workflow
    efficiency improvement
    przepływ pracy
    wydajność
    projektowanie przestrzeni pracy
    organizacja przestrzeni
    Opis:
    In a competitive market the manufacturing companies have to produce cost effective products which can be realized by minimized production cost and higher effectiveness. The effective facility planning can significantly reduce the operational costs of companies. An adequate facility layout can result in the improvement of the performance of the production line. The Facility Layout Problem (FLP) is relating to location of objects (departments, workstations, machines, etc.) on a given site and the material flow between these objects. The goal of this study is to show the reasons, objectives and steps of a layout redesign process. The minimization of the workflow realized on the shop floor is an often applied an objective function during the layout redesign. Material flow efficiency is a commonly used term for the determination of the amount of workflow, which is the multiplication of material flow data and distance data. In this study, this mathematical method for workflow calculation is introduced. The described case study shows how the efficiency and reduced manufacturing cost of a real manufacturing system can be improved by re-layout design, while smaller floor space is needed for the production.
    Źródło:
    Journal of Applied Mathematics and Computational Mechanics; 2017, 16, 1; 63-74
    2299-9965
    Pojawia się w:
    Journal of Applied Mathematics and Computational Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New logistics and production trends as the effect of global economy changes
    Nowe trendy logistyki i produkcji jako efekt zmian gospodarki światowej
    Autorzy:
    Kovacs, G.
    Kot, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/404944.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Częstochowska
    Tematy:
    logistics
    tendencies
    supply chain
    production
    industry 4.0
    logistyka
    tendencje
    łańcuch dostaw
    produkcja
    przemysł 4.0
    Opis:
    The growing market globalization, increasing global competition, and more complex products results application of new technologies, methods and business processes. Fast changing market environment and fluctuating customer demands require efficient operation of logistical processes. In this study the logistical tendencies and challenges are introduced with reasons and driving forces. Tendencies in the changes of customer demands, production requirements, formation of supply chains, inventory strategies, transportation activities and activity of the logistics service sector are analyzed. Finally the Industry 4.0 conception is introduced which will change the production and logistical processes drastically.
    Rosnąca globalizacja gospodarki, wzmagająca się konkurencja światowa oraz bardziej złożone produkty prowadzą do zastosowania nowych technologii, metod i procesów biznesowych. Szybko zmieniające się otoczenie rynkowe i zmieniający się popyt wymagają sprawnego funkcjonowania procesów logistycznych. W niniejszym badaniu omówione zostały tendencje i wyzwania logistyczne wraz z ich uzasadnieniem i siłami, które wpływają na ich rozwój. Analizowane są tendencje zmian wymagań klientów, wymagań produkcyjnych, tworzenia łańcuchów dostaw, zapasów, strategii działań komunikacyjnych oraz aktywności sektora usług logistycznych. Wreszcie omówiona została koncepcja Przemysłu 4.0, która drastycznie zmieni procesy produkcyjne i logistyczne.
    Źródło:
    Polish Journal of Management Studies; 2016, 14, 2; 115-126
    2081-7452
    Pojawia się w:
    Polish Journal of Management Studies
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Simulation of complex logistical service processes
    Autorzy:
    Gubán, M.
    Kovács, G.
    Kot, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/406845.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fluid flow
    process improvement
    mathematical model
    simulation
    Opis:
    The world around us is a very complex and multi-parametric system, like the weather, traffic, operation of machines, production processes, service processes, etc. Understanding of the characteristics, operation and behaviour of these systems and processes is not easy due to their complexity. The design of optimal production and service procedures is an essential task for planners. The target is the increasing of the efficiency of the production and service and analysis of the effect of parameter changing. There are lot of tools and sophisticated methods for design, analysis and improvement of logistical processes. The most often used analysis tool is the simulation in the production processes. Our aim in this article is to show that the simulation can be used efficiently in case of analysis of service processes, not only in case of production processes. The simulation is available for bottleneck analysis of service activities not only for production processes. In this study the simulation of a service process was realized by the AnyLogic software. The relevance of the simulation technique for analysis of complex service processes is proved by a case study of a service and maintenance activity of a multinational shopping centre.
    Źródło:
    Management and Production Engineering Review; 2017, 8, 2; 19-29
    2080-8208
    2082-1344
    Pojawia się w:
    Management and Production Engineering Review
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radon and thoron parallel measurements in dwellings nearby a closed Hungarian uranium mine
    Autorzy:
    Németh, C.
    Jobbágy, V.
    Kávási, N.
    Somlai, J.
    Kovács, T.
    Tokonami, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/148705.pdf
    Data publikacji:
    2010
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    radon
    thoron
    dwelling
    Opis:
    Integrated measurements of radon (222Rn) and thoron (220Rn) were executed in a Hungarian village, located in the vicinity of an abandoned uranium mine. The applied passive radon and thoron monitor was the RADUET which is based on a CR-39 track detector. The investigated 35 houses were one storey buildings made of bricks. The rock under the village is a gray-sandstone with an average of 136 and 77 Bqźkg–1 uranium and thorium, respectively. The detectors were mostly placed in the inhabited areas of the houses, such as bedrooms and living-rooms, at a height of 1–1.5 m close to the wall. The measurement periods were between December 2006 and May 2007 and between May 2007 and February 2008. Annual averages of radon concentrations were calculated applying seasonal correction factors to the results of the two measurement periods. The results show that the radon concentrations in the case of considerable part of the investigated dwellings seems to be significantly higher than the Hungarian averages for ground-floor houses (152 Bqźm–3). The thoron concentrations in some cases are also not negligible indicating that radon measurements which are sensitive to thoron can be misleading. Additionally, thoron can also be a contributor of extra dose.
    Źródło:
    Nukleonika; 2010, 55, 4; 459-462
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Nutrient content restructuring and CT-measured density, volume attritions on damaged beans caused by Acanthoscelides obtectus Say (Coleoptera: Chrysomelidae)
    Autorzy:
    Keszthelyi, S.
    Egri, H.B.
    Horvath, D.
    Csoka, A.
    Kovacs, G.
    Donko, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/65538.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    leguminous plant
    plant product
    nutrient content
    bean
    pest
    risk
    computer tomography
    Acanthoscelides obtectus
    Coleoptera
    Chrysomelidae
    density
    storage
    Opis:
    Leguminous plant products have great nutritional and economic importance in the European Union, which is reflected by its protein policy. These harvested yields are risked by stored product pests, such as Acanthoscelides obtectus Say, which can cause up to 50–60% loss in stored bean items. The bean weevil causes both quantitative and qualitative damage to seeds. We aimed to map the qualitative damage of this devastating pest, which deteriorates the nutritional content of bean kernels. Furthermore, our purpose was to determine accurately the decrease in the volume and density alteration in beans caused by this important stored product pest using CT-assisted imaging analysis. Our results showed that the nutritional arrangement in damaged beans was caused by A. obtectus. The measured nutrient content increment in damaged samples can be explained by the presence of extraneous organic material which originates from perished specimens of the bruchin pest. This is a negative phenomenon in bean items used as forage, because of the loss of valuable proteins and rancidity in herbal oils. Weight loss triggered by developing larvae was 49.42% in examined bean items. The use of 3D technologies has greatly improved and facilitated the detailed investigation of injured seeds. The density (75,834 HU; 41.93%) and the volume (296.162 mm3; 26.21%) values measured by CT of the examined samples were significantly decreased. The decreasing of tissue density in damaged beans can be accounted for by the consumption of starch present at a high ratio and that of the dense reserve components in the cotyledons.
    Źródło:
    Journal of Plant Protection Research; 2018, 58, 1
    1427-4345
    Pojawia się w:
    Journal of Plant Protection Research
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Activated Transport in Magnetic-Field Induced Insulating Phase in Two-Dimensional Electron Gas in InGaAs/InP Heterostructures
    Autorzy:
    Pődör, B.
    Gombos, G.
    Reményi, G.
    Kovács, Gy.
    Savel'ev, I. G.
    Novikov, S. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968409.pdf
    Data publikacji:
    1997-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.Dx
    Opis:
    We report on experiments on low temperature (millikelvin range) activated magnetotransport on low-density two-dimensional electron systems in InGaAs/InP for Landau level filling factors 0.25 ≤ ν ≤ 0.55. The activation energy increases approximately linearly with decreasing filling factor. The observations are discussed in the light of the formation of the Wigner solid.
    Źródło:
    Acta Physica Polonica A; 1997, 92, 5; 945-949
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determining of thermal stability of explosives for civil uses modern equipment equipped with automatic temperature and pressure
    Określenie stabilności temperaturowej materiałów wybuchowych dla zastosowań cywilnych w nowoczesnych urządzeniach z automatycznym sterowaniem temperaturą i ciśnieniem
    Autorzy:
    Vasilescu, G.
    Ghicioi, E.
    Kovacs, A.
    Lupu, C.
    Gheorghiosu, E.
    Rus, D. C.
    Ilici, Ş.
    Jitea, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/409718.pdf
    Data publikacji:
    2015
    Wydawca:
    STE GROUP
    Tematy:
    thermal stability
    security parameter
    continuous monitoring
    temperature
    pressure
    stabilność temperaturowa
    parametry bezpieczeństwa
    ciągłe monitorowanie
    temperatura
    ciśnienie
    Opis:
    Thermal stability of explosives for civil use is a key security parameter. When the explosive is exposed to high temperatures in a given period of time can lead to undesirable phenomena such as decomposing or even very dangerous as uncontrolled detonation.
    Stabilność temperaturowa materiałów wybuchowych dla zastosowań cywilnych jest kluczowym parametrem bezpieczeństwa. W sytuacji, w której materiał taki jest narażony na oddziaływanie wysokich temperatur w danym okresie czasu, mogą zaistnieć niepożądane zjawiska, takie jak dekompozycja lub niekontrolowana detonacja.
    Źródło:
    Management Systems in Production Engineering; 2015, 3 (19); 147-151
    2299-0461
    Pojawia się w:
    Management Systems in Production Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Energy Relaxation in Two-Dimensional Electron GaS in InGaAs/InP via Electron-Acoustic Phonon Interaction
    Autorzy:
    Kreshchuk, A. M.
    Novikov, S. V.
    Savel'ev, I. G.
    Polyanskaya, T. A.
    Pődör, B.
    Reményi, G.
    Kovács, Gy.
    Powiązania:
    https://bibliotekanauki.pl/articles/1991650.pdf
    Data publikacji:
    1998-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    72.20.-i
    Opis:
    The energy relaxation in two-dimensional electron gas in In$\text{}_{0.53}$Ga$\text{}_{0.47}$As/InP has been studied in a wide range of electron temperatures (from 0.1 to 10 K). The energy loss rate of electrons is controlled by the interaction of electrons with the piezoelectric potential of acoustic phonons. The value of the piezoelectric constant for InGaAs lattice-matched to InP is deduced from theoretical fits of the experimental data: h$\text{}_{14}$=(1.1±0.1)×10$\text{}^{7}$ V/cm. Available data for the piezoelectric constant of In$\text{}_{x}$Ga$\text{}_{1-x}$As are discussed in the light of the results of this work.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 3; 415-420
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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